For practical large-scale applications of computational fluid dynamics in the aero-space industry,implicit flow solvers are necessitated for efficient simulations.This paper presents the implementation of a solver tha...For practical large-scale applications of computational fluid dynamics in the aero-space industry,implicit flow solvers are necessitated for efficient simulations.This paper presents the implementation of a solver that employs an unstructured finite volume approach and a Multi-Colored Gauss-Seidel(MCGS)method for steady-state compressible flow simulations on a server equipped with multiple Graphics Process-ing Units(GPUs).The mesh partition process is completed with PyMetis,and Mes-sage Passing Interface(MPI)is utilized for communications between mesh partitions.A parallel coloring algorithm is employed in the pre-processing module.The code is developed using a hybrid programming approach,with the main framework writ-ten in Python and the GPU kernel source codes written in C.The transonic turbulent flows over the CHN-T1 transport aircraft model are simulated on unstructured hybrid meshes.The numerical results are compared with experimental data,and the perfor-mance of the developed flow simulation framework is analysed.展开更多
Developing an accurate and visual sensing strategy for trace levels of fluoroquinolone residues that pose threat to food safety and human health is highly desired but remains challenging.Herein,a target selfcalibratio...Developing an accurate and visual sensing strategy for trace levels of fluoroquinolone residues that pose threat to food safety and human health is highly desired but remains challenging.Herein,a target selfcalibration ratiometric fluorescent sensing platform has been designed for sensitive visual detection of levofloxacin(LEV)based on fluorescent europium metal-organic framework(Eu-MOF)probe.Specifically,the Eu-MOF was facilely synthesized via directly mixing Eu^(3+)with 1,10-phenanthroline-2,9-dicarboxylic acid(PDA)ligand at room temperature,which exhibited well-stable red fluorescence at 612 nm.Upon the addition of target LEV,the significant fluorescence quenching from Eu^(3+)was observed owing to the inner filter effect between the Eu-MOF and LEV.While the intrinsic fluorescence for LEV at 462nm was gradually enhanced,thereby realizing the self-calibration ratiometric fluorescence responses to LEV.Through this strategy,LEV can be detected down to 27 nmol/L.Furthermore,a test paper-based Eu-MOF integrated with the smartphone assisted RGB color analysis was exploited for the quantitative monitoring of LEV through the multi-color changes from red to blue,thus achieved portable,convenient and visual detection of LEV in honey and milk samples.Therefore,the developed strategy could provide a useful tool for supporting the practical on-site test in food samples.展开更多
This work addresses the cut order planning(COP)problem for multi-color garment production,which is the first step in the clothing industry.First,a multi-objective optimization model of multicolor COP(MCOP)is establish...This work addresses the cut order planning(COP)problem for multi-color garment production,which is the first step in the clothing industry.First,a multi-objective optimization model of multicolor COP(MCOP)is established with production error and production cost as optimization objectives,combined with constraints such as the number of equipment and the number of layers.Second,a decoupled multi-objective optimization algorithm(DMOA)is proposed based on the linear programming decoupling strategy and non-dominated sorting in genetic algorithmsⅡ(NSGAII).The size-combination matrix and the fabric-layer matrix are decoupled to improve the accuracy of the algorithm.Meanwhile,an improved NSGAII algorithm is designed to obtain the optimal Pareto solution to the MCOP problem,thereby constructing a practical intelligent production optimization algorithm.Finally,the effectiveness and superiority of the proposed DMOA are verified through practical cases and comparative experiments,which can effectively optimize the production process for garment enterprises.展开更多
BACKGROUND Near-infrared fluorescence imaging via using intravenous indocyanine green(ICG)has a wide range of applications in multiple surgical scenarios.In lapa-roscopic cholecystectomy(LC),it facilitates intraoperat...BACKGROUND Near-infrared fluorescence imaging via using intravenous indocyanine green(ICG)has a wide range of applications in multiple surgical scenarios.In lapa-roscopic cholecystectomy(LC),it facilitates intraoperative identification of the biliary system and reduces the risk of bile duct injury.However,the usual single color fluorescence imaging(SCFI)has limitations in manifesting the fluorescence signal of the target structure when its intensity is relatively low.Moreover,sur-geons often experience visual fatigue.We hypothesized that a novel imaging stra-tegy,named multi-color fluorescence imaging(MCFI),could potentially address these issues by decreasing hepatic and background fluorescence pollution and improving biliary visualization.AIM To investigate the novel imaging strategy MCFI in LC.METHODS This was a single-center retrospective study conducted at Peking Union Medical College Hospital,Beijing,China.Patients who underwent LC from June 2022 to March 2023 by the same surgical team were enrolled.Demographic features,clinical and surgical information were collected.The clarity,visual comfort,and effectiveness of different imaging strategies were subjectively evaluated by surgeons.RESULTS A total of 155 patients were included,60 patients were in the non-ICG group in which only bright light illuminance without ICG was applied,60 patients were in the SCFI group,and 35 patients were in the MCFI group.No statist-ically significant differences were found in demographics or clinical history.Post-surgical complications were minimal in all 3 groups with no significant differences observed.MCFI improved the clarity of imaging and visual comfort.Clarity of imaging and visual comfort were improved with MCFI.CONCLUSION MCFI improves biliary visualization and reduces liver fluorescence contamination,which supports its routine use in LC.MCFI may also be a better choice than SCFI in other clinical settings.展开更多
Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some...Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some color-printing systems. It is difficult, however, to model the composed color with the multiple inks when the number of the output ink hues exceeds three due to the none-unique mapping between the color spaces of the CIE Lab and the multi-color printing device. In this paper, we propose a fine color-printing method for multi-color printing device with the ink set of more than three hues. The proposed approach has good color expression ability and provides fine control of the printed color. By dividing the output color space into several subspaces, our method allows one-to-one mapping between the standard color space and the multi-color output color space. It has been proved effective when applied to the digital inkjet printer—Mutoh8000.展开更多
We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Com- paring the two-color laser scheme, of which the uncommon frequency ratio should be set to be a speci...We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Com- paring the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump com- ponent and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.展开更多
Multi-color luminescence basing on amorphous Eu^3＋/Tb^3＋ co-doped Zn-A1 hydroxides and their annealed samples were studied in detail. Results suggest that excellent red emissions due to E^u3＋ and green emissions at...Multi-color luminescence basing on amorphous Eu^3＋/Tb^3＋ co-doped Zn-A1 hydroxides and their annealed samples were studied in detail. Results suggest that excellent red emissions due to E^u3＋ and green emissions attributed to Tb^3＋ appear under the excitation of favorable wavelength for all the as- prepared amorphous samples. Moreover, the emission intensity depends on the Eu^3＋/Tb^3＋ molar ratio. The samples annealed at 300, 500, and 700 ℃ still exhibit amorphous state, and multi-color lumi- nescence kept in the samples annealed at 300 ℃, while luminescence quenched for the samples annealed at 500 and 700 ℃. However, a broad emission ranging from 450 to 650 nm occurs in some samples annealed at 900 ℃. Further, the fluorescence decay and lifetimes for the as-prepared samples and the samples annealed at 300℃ were investigated. It is found that all the decay curves of emissions due to Tb^3＋ and Eu^3＋ present characteristic double exponential function despite their different lifetimes. The present work may be a good example for developing new multi-color even white light emitting materials.展开更多
Manipulating and real-time monitoring of neuronal activities with cell-type specificity and precise spatiotemporal resolution during animal behavior are fundamental technologies for exploring the functional connectivi...Manipulating and real-time monitoring of neuronal activities with cell-type specificity and precise spatiotemporal resolution during animal behavior are fundamental technologies for exploring the functional connectivity, information transmission, and physiological functions of neural circuits in vivo. However, current techniques for optogenetic stimulation and neuronal activity recording mostly operate independently. Here, we report an all-fiber-transmission photometry system for simultaneous optogenetic manipulation and multi-color recording of neuronal activities and the neurotransmitter release in a freely moving animal. We have designed and manufactured a wavelength-independent multi-branch fiber bundle to enable simultaneous optogenetic manipulation and multi-color recording at different wavelengths. Further, we combine a laser of narrow linewidth with the lock-in amplification method to suppress the optogenetic stimulation-induced artifacts and channel crosstalk. We show that the collection efficiency of our system outperforms a traditional epi-fluorescence system. Further, we demonstrate successful recording of dynamic dopamine(DA) responses to unexpected rewards in the nucleus accumbens(NAc) in a freely moving mouse. We also show simultaneous dual-color recording of neuronal Ca2+ signals and DA dynamics in the NAc upon delivering an unexpected reward and the simultaneous optogenetic activating at dopaminergic terminals in the same location. Thus, our multi-function fiber photometry system provides a compatible, efficient, and flexible solution for neuroscientists to study neural circuits and neurological diseases.展开更多
Mechano-luminescence(ML) has been found diverse applications such as stress sensing,3-D signature,energy harvesting,and anti-counterfeiting,due to the unique properties of the corresponding ML phosphors performing in-...Mechano-luminescence(ML) has been found diverse applications such as stress sensing,3-D signature,energy harvesting,and anti-counterfeiting,due to the unique properties of the corresponding ML phosphors performing in-situ and real-time response to mechanical stimulus.Trap-controlled ML materials realize reproducible,quantitative mechano-optical conversion resulting from the released carriers for the trap-mediated charge storage and release.Herein,modulating traps matters the controllable ML behavior for their promising applications.In this work,a deep trap distributed ranging from 0.9 to 1,3 eV is realized consecutively for the introduction of Sm^(3+)ions into LaGaO_(3) matrix,which contributes to the red emission at 600 nm under mechanical stimuli.Moreover,tunable ML emission modulated from 600to 545 nm is successfully achieved for the codopant of Tb^(3+)ions.It is unambiguously indicated that the released carriers from the trap sharing rather than an additional constructed trap contribute to the modulated ML color.Accordingly,multi-mode anti-counterfeiting and encryption are achieved with the as-explored Sm^(3+),Tb^(3+)co-activated ML phosphor.展开更多
In an automatic bobbin management system that simultaneously detects bobbin color and residual yarn,a composite texture segmentation and recognition operation based on an odd partial Gabor filter and multi-color space...In an automatic bobbin management system that simultaneously detects bobbin color and residual yarn,a composite texture segmentation and recognition operation based on an odd partial Gabor filter and multi-color space hierarchical clustering are proposed.Firstly,the parameter-optimized odd partial Gabor filter is used to distinguish bobbin and yarn texture,to explore Garbor parameters for yarn bobbins,and to accurately discriminate frequency characteristics of yarns and texture.Secondly,multi-color clustering segmentation using color spaces such as red,green,blue(RGB)and CIELUV(LUV)solves the problems of over-segmentation and segmentation errors,which are caused by the difficulty of accurately representing the complex and variable color information of yarns in a single-color space and the low contrast between the target and background.Finally,the segmented bobbin is combined with the odd partial Gabor’s edge recognition operator to further distinguish bobbin texture from yarn texture and locate the position and size of the residual yarn.Experimental results show that the method is robust in identifying complex texture,damaged and dyed bobbins,and multi-color yarns.Residual yarn identification can distinguish texture features and residual yarns well and it can be transferred to the detection and differentiation of complex texture,which is significantly better than traditional methods.展开更多
Fluorescence imaging in the second near-infrared window(NIR-II,900–1880 nm)with less scattering background in biological tissues has been combined with the confocal microscopic system for achieving deep in vivo imagi...Fluorescence imaging in the second near-infrared window(NIR-II,900–1880 nm)with less scattering background in biological tissues has been combined with the confocal microscopic system for achieving deep in vivo imaging with high spatial resolution.However,the traditional NIR-IIfluorescence confocal microscope with separate excitation focus and detection pinhole makes it possess low confocal e±ciency,as well as di±cultly to adjust.Two types of upgraded NIR-IIfluorescence confocal microscopes,sharing the same pinhole by excitation and emission focus,leading to higher confocal e±ciency,are built in this work.One type is-ber-pinhole-based confocal microscope applicable to CW laser excitation.It is constructed forfluorescence intensity imaging with large depth,high stabilization and low cost,which could replace multiphotonfluorescence microscopy in some applications(e.g.,cerebrovascular and hepatocellular imaging).The other type is air-pinhole-based confocal microscope applicable to femtosecond(fs)laser excitation.It can be employed not only for NIR-IIfluorescence intensity imaging,but also for multi-channelfluorescence lifetime imaging to recognize different structures with similarfluorescence spectrum.Moreover,it can be facilely combined with multiphotonfluorescence microscopy.A single fs pulsed laser is utilized to achieve up-conversion(visible multiphotonfluorescence)and down-conversion(NIR-II one-photonfluorescence)excitation simultaneously,extending imaging spectral channels,and thus facilitates multi-structure and multi-functional observation.展开更多
High-resolution organic arrays with diverse pixel types hold significant promise for various applications,such as full-color displays and photonic crystals.The direct growth of such arrays(e.g.,high-resolution multi-c...High-resolution organic arrays with diverse pixel types hold significant promise for various applications,such as full-color displays and photonic crystals.The direct growth of such arrays(e.g.,high-resolution multi-color patterns)cannot be achieved in a single step with conventional strategies.Here,we present a viable approach integrating a bottom-up solution strategy with phase-change materials(PCMs),specifically aggregation-induced emission(AIE)materials.Through intentional self-assembly,color-programmable organic micro-patterns featuring distinct phases or colors were created.Notably,manipulating the amount of involved substance for nucleation/crystallization was achieved by adjusting the sizes of pre-defined nucleation sites.This precise control resulted in varied phases and colors for each pixel.Thus,high-resolution organic micro-arrays with transfer-free multi-color pixels were directly achieved.These may open avenues for seamless,transfer-free growth of multifunctional micro-patterns using PCMs,holding immense potential for applications in high-resolution full-color imaging/displays,photonic crystals,information storage,and encryption,etc.展开更多
Purely organic single-component luminescent materials enabling multi-color photoluminescence are gaining significant interest,given their tunable optical properties,environmental friendliness,and cost-effectiveness.Ho...Purely organic single-component luminescent materials enabling multi-color photoluminescence are gaining significant interest,given their tunable optical properties,environmental friendliness,and cost-effectiveness.However,realizing multi-color electroluminescence from a single-component emitter for application in organic light-emitting diode(OLED)remains challenging,mainly due to the limitations in achieving distinct excited-state conformations in amorphous or solid states.In this study,we report two novel emitters(Bppy-PTZ and Bpph-PTZ)by incorporating a benzophenone acceptor and phenothiazine donor with pyridyl and phenylπ-bridging spacers.The introduction of a pyridine ring in Bppy-PTZ establishes intramolecular hydrogen bonding,stabilizing the quasi-axial(QA)conformation in the amorphous state,thereby facilitating multi-color and white-light emissions in thin-film and OLED devices.Photophysical and theoretical analyses reveal distinct emission behaviors from QA and quasi-equatorial conformations,with Bppy-PTZ exhibiting enhanced dual-emission and mechanochromic properties.Importantly,by adopting single-component Bppy-PTZ,the fabricated OLEDs realize color-tunable emissions,including blue,yellow,and adjustable white lights,reaching maximum external quantum efficiencies of up to 15.5%.This work provides valuable insights for the development of efficient single-component emitters affording multi-color OLEDs with high performances.展开更多
AIM： To explore the effect of the posterior astigmatism on total corneal astigmatism and evaluate the error caused by substituting the corneal astigmatism of the simulated keratometriy （simulated K） for the total c...AIM： To explore the effect of the posterior astigmatism on total corneal astigmatism and evaluate the error caused by substituting the corneal astigmatism of the simulated keratometriy （simulated K） for the total corneal astigmatism in age-related cataract patients. METHODS： A total of 211 eyes with age-related cataract from 164 patients （mean age： 66.8±9.0y, range： 45-83y） were examined using a multi-colored spot reflection topographer, and the total corneal astigmatism was measured. The power vector components J0 and J45 were analyzed. Correlations between the magnitude difference of the simulated K and total cornea astigmatism （magnitude differenceSimK-Tca）, anterior J0, and absolute meridian difference （AMD） between the anterior and posterior astigmatisms were calculated. To compare the astigmatism of the simulated K and total cornea both in magnitude and axial orientation, we drew double-angle plots and calculated the vector difference between the two measures using vector analysis. A corrective regression formula was used to adjust the magnitude of the simulated K astigmatism to approach that of the total cornea. RESULTS： The magnitude differenceSimK-Tca was positively correlated with the anterior corneal J0 （Spearman’s rho= 0.539; P〈0.001） and negatively correlated with the AMDR （Spearman’s rho=-0.875, P〈0.001）. When the anterior J0 value was larger than 1.3 D or smaller than -0.8 D, the errors caused by determining the total corneal astigmatism with the karatometric calculation tended to be greater than 0.25 D. An underestimation by 16% was observed for against the rule （ATR） astigmatism and an overestimation by 9% was observed for with the rule （WTR） astigmatism when ignoring the posterior measurements. CONCLUSION： Posterior corneal astigmatism should be valued for more precise corneal astigmatism management, especially for higher ATR astigmatism of the anterior corneal surface. We suggest a 9% reduction in the magnitude of the simulated K in eyes with WTR astigmatism, and a 16% addition of the magnitude of the simulated K in eyes with ATR astigmatism.展开更多
A type of novel electrospun supramolecular hybrid microfibers comprising poly(9-(4-(octyloxy)-phenyl)-2,7-fluoren-9-ol)(PPFOH)and poly(A/-vinylcarbazole)(PVK)are successfully prepared for intriguing multi-color emissi...A type of novel electrospun supramolecular hybrid microfibers comprising poly(9-(4-(octyloxy)-phenyl)-2,7-fluoren-9-ol)(PPFOH)and poly(A/-vinylcarbazole)(PVK)are successfully prepared for intriguing multi-color emission properties.The supramolecular tunable PPFOH aggregation in PVK matrix endows the complex with a smart energy transfer behavior to obtain the multi-color emissions.In stark contrast to PVK fibers,the emission color of PPFOH/PVK fibers with an efficient dispersion of PPFOH fluorophores at a proper dope ratio can be tuned in a wide spectrum of blue(0.1%),sky blue(0.5%),nearly white(1%),cyan(2%),green(5%)and yellow(10%).Besides,conductive behaviors of the microfiber were demonstrated in accompany with the increment of the doping ratio of PPFOH to PVK.Successful fabrication of polymer light-emitting diode(PLED)based on the blended electrospun fiber provided a further evidence of its excellent electrical property for potential applications in optoelectronic devices.展开更多
This paper presents Charge-Coupled Device time-series photometric observations of the open cluster NGC 1582 and its surrounding field with Johnson B, V and R filters by using the Nanshan 1 m telescope administered by ...This paper presents Charge-Coupled Device time-series photometric observations of the open cluster NGC 1582 and its surrounding field with Johnson B, V and R filters by using the Nanshan 1 m telescope administered by Xinjiang Astronomical Observatory. 19 variable stars and three variable candi- dates were detected in a 45＇ - 48.75＇ field around the cluster. 12 of the variable stars are newly-discovered variable objects. The physical properties, classifications and memberships of these 22 objects are studied through their light curves, their positions on the color-magnitude diagram and with archival data from the Naval Observatory Merged Astrometric Dataset. Among these objects, five are eclipsing binary systems, six are pulsating variable stars including one known 6 Scuti star and one newly-discovered RR Lyrae star. The distance to the RR Lyrae star is estimated to be 7.9 - 0.3 kpc, indicating that the star is located far behind the cluster. Four variable stars are probable members of the cluster, and 13 of the 22 objects are confirmed to be field stars.展开更多
Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with ...Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with multicolor solid-state fluorescence remains a formidable challenge due to its complicated construction.In the present work,a novel class of multicolor AIE CDs(M-CDs)were fabricated using selected precursor(salicylic acid,thiosalicylic acid,and 2,2'-dithiodibenzoic acid),with an eco-friendly,low-cost one-pot solvothermal method.In the dilute organic solution,M-CDs manifested blue emission,but upon aggregation in the presence of water,the red,yellow,green,and blue emissions were displayed due to the AIE effect.Structural analysis,coupled with theoretical calculations,revealed that the increase in the size of sp2 domains would lower the Eg and cause a red-shift emission wavelength.Significantly,the continuous emission of M-CDs from blue to red can be utilized as ink for multimode printing,enabling the creation of a variety of school badges and quick response codes.These findings hold promising implications for multi-information encryption applications.展开更多
Photoluminescence properties of Sr 2.5 Dy 1/3-x Eu x V 2 O 8（x=0,0.06,0.12,0.18,0.24,0.33） were investigated.The excitation spectra included a broad band in the short wavelength region and several sharp lines in the...Photoluminescence properties of Sr 2.5 Dy 1/3-x Eu x V 2 O 8（x=0,0.06,0.12,0.18,0.24,0.33） were investigated.The excitation spectra included a broad band in the short wavelength region and several sharp lines in the longer wavelength region,and the spectral origin were discussed.The emission spectra were measured in two different exciting ways,i.e.,exciting the VO 4 group at 270 nm and the Eu 3＋ ion at 398 nm,respectively,and the energy transferring process was reasonably suggested.Furthermore,multi-color emission could be achieved in Sr 2.5 Dy 1/3-x Eu x V 2 O 8,indicating that the studied samples had potential applications in the white light emitting diodes.Further investigation showed that reducing the concentration of Eu 3＋ and Dy 3＋ and introducing Bi 3＋ as a sensitizer ion greatly enhanced the emission intensity.展开更多
Chiral phosphorescent materials have received extensive research owing to the unique properties of optical activity in recent years.Many phosphorescent carbon dots(CDs)materials have been reported,but the research on ...Chiral phosphorescent materials have received extensive research owing to the unique properties of optical activity in recent years.Many phosphorescent carbon dots(CDs)materials have been reported,but the research on chiral phosphorescence is still in the exploratory stage.This work designs multi-color room temperature phosphorescent(RTP)CDs with chiral signals,which are fully mixed with aromatic aldehyde precursors and chiral amino compounds precursors in a boric acid(BA)matrix and can be easily prepared by solvent-free thermal method.The prepared(R)-GCDs,(R)-YCDs and(R)-RCDs achieved phosphorescence emission at 545 nm,582 nm,and 654 nm,respectively,and exhibited corresponding circular dichroism(CD)signals at 341 nm,394 nm,384 nm,and 380 nm,448 nm,and 435 nm,respectively.The longest phosphorescence lifetime is up to 946 ms.Specifically,YCDs exhibit time-dependent phosphorescence under UV excitation,and the afterglow time under white light excitation can reach 40 s.This article provides a new approach to the study of chiral phosphorescence.展开更多
A universal method of micro-patterning thin quantum dot films is highly desired by industry to enable the integration of quantum dot materials with optoelectronic devices.Many of the methods reported so far,including ...A universal method of micro-patterning thin quantum dot films is highly desired by industry to enable the integration of quantum dot materials with optoelectronic devices.Many of the methods reported so far,including specially engineered photoresist or ink-jet printing,are either of poor yield,resolution limited,difficult to scale for mass production,overly expensive,or sacrificing some optical quality of the quantum dots.In our previous work,we presented a dry photolithographic lift-off method for pixelization of solution-processed materials and demonstrated its application in patterning perovskite quantum dot pixels,10μm in diameter,to construct a static micro-display.This report presents further development of this method and demonstrates high-resolution patterning(~1μm diameter),full-scale processing on a 100 mm wafer,and multi-color integration of two different varieties of quantum dots.Perovskite and cadmium-selenide quantum dots were adopted for the experimentation,but the method can be applied to other types of solution-processed materials.We also demonstrate the viability of this method for constructing high-resolution micro-arrays of quantum dot color-convertors by fabricating patterned films directly on top of a blue gallium-nitride LED substrate.The green perovskite quantum dots used for fabrication were synthesized via the room-temperature ligand-assisted reprecipitation method developed by our research group,yielding a photoluminescent quantum yield of 93.6%and full-width half-maximum emission linewidth less than 20 nm.Our results demonstrate the viability of this method for use in scalable manufacturing of high-resolution micro-displays paving the way for improved optoelectronic applications.展开更多
基金sponsored by Shanghai Pujiang Program(Grant No.22PJ1420200).
文摘For practical large-scale applications of computational fluid dynamics in the aero-space industry,implicit flow solvers are necessitated for efficient simulations.This paper presents the implementation of a solver that employs an unstructured finite volume approach and a Multi-Colored Gauss-Seidel(MCGS)method for steady-state compressible flow simulations on a server equipped with multiple Graphics Process-ing Units(GPUs).The mesh partition process is completed with PyMetis,and Mes-sage Passing Interface(MPI)is utilized for communications between mesh partitions.A parallel coloring algorithm is employed in the pre-processing module.The code is developed using a hybrid programming approach,with the main framework writ-ten in Python and the GPU kernel source codes written in C.The transonic turbulent flows over the CHN-T1 transport aircraft model are simulated on unstructured hybrid meshes.The numerical results are compared with experimental data,and the perfor-mance of the developed flow simulation framework is analysed.
基金supported by the National Natural Science Foundation of China(Nos.32260247 and 22064010)the Natural Science Foundation of Jiangxi Province(Nos.20232BAB215071 and 20224BAB213009).
文摘Developing an accurate and visual sensing strategy for trace levels of fluoroquinolone residues that pose threat to food safety and human health is highly desired but remains challenging.Herein,a target selfcalibration ratiometric fluorescent sensing platform has been designed for sensitive visual detection of levofloxacin(LEV)based on fluorescent europium metal-organic framework(Eu-MOF)probe.Specifically,the Eu-MOF was facilely synthesized via directly mixing Eu^(3+)with 1,10-phenanthroline-2,9-dicarboxylic acid(PDA)ligand at room temperature,which exhibited well-stable red fluorescence at 612 nm.Upon the addition of target LEV,the significant fluorescence quenching from Eu^(3+)was observed owing to the inner filter effect between the Eu-MOF and LEV.While the intrinsic fluorescence for LEV at 462nm was gradually enhanced,thereby realizing the self-calibration ratiometric fluorescence responses to LEV.Through this strategy,LEV can be detected down to 27 nmol/L.Furthermore,a test paper-based Eu-MOF integrated with the smartphone assisted RGB color analysis was exploited for the quantitative monitoring of LEV through the multi-color changes from red to blue,thus achieved portable,convenient and visual detection of LEV in honey and milk samples.Therefore,the developed strategy could provide a useful tool for supporting the practical on-site test in food samples.
基金Supported by the Natural Science Foundation of Zhejiang Province(No.LQ22F030015).
文摘This work addresses the cut order planning(COP)problem for multi-color garment production,which is the first step in the clothing industry.First,a multi-objective optimization model of multicolor COP(MCOP)is established with production error and production cost as optimization objectives,combined with constraints such as the number of equipment and the number of layers.Second,a decoupled multi-objective optimization algorithm(DMOA)is proposed based on the linear programming decoupling strategy and non-dominated sorting in genetic algorithmsⅡ(NSGAII).The size-combination matrix and the fabric-layer matrix are decoupled to improve the accuracy of the algorithm.Meanwhile,an improved NSGAII algorithm is designed to obtain the optimal Pareto solution to the MCOP problem,thereby constructing a practical intelligent production optimization algorithm.Finally,the effectiveness and superiority of the proposed DMOA are verified through practical cases and comparative experiments,which can effectively optimize the production process for garment enterprises.
基金Supported by the National High Level Hospital Clinical Research Funding,No.2022-PUMCH-B-003Beijing Technology Innovation Foundation for University or College Students,No.2022zglc06062.
文摘BACKGROUND Near-infrared fluorescence imaging via using intravenous indocyanine green(ICG)has a wide range of applications in multiple surgical scenarios.In lapa-roscopic cholecystectomy(LC),it facilitates intraoperative identification of the biliary system and reduces the risk of bile duct injury.However,the usual single color fluorescence imaging(SCFI)has limitations in manifesting the fluorescence signal of the target structure when its intensity is relatively low.Moreover,sur-geons often experience visual fatigue.We hypothesized that a novel imaging stra-tegy,named multi-color fluorescence imaging(MCFI),could potentially address these issues by decreasing hepatic and background fluorescence pollution and improving biliary visualization.AIM To investigate the novel imaging strategy MCFI in LC.METHODS This was a single-center retrospective study conducted at Peking Union Medical College Hospital,Beijing,China.Patients who underwent LC from June 2022 to March 2023 by the same surgical team were enrolled.Demographic features,clinical and surgical information were collected.The clarity,visual comfort,and effectiveness of different imaging strategies were subjectively evaluated by surgeons.RESULTS A total of 155 patients were included,60 patients were in the non-ICG group in which only bright light illuminance without ICG was applied,60 patients were in the SCFI group,and 35 patients were in the MCFI group.No statist-ically significant differences were found in demographics or clinical history.Post-surgical complications were minimal in all 3 groups with no significant differences observed.MCFI improved the clarity of imaging and visual comfort.Clarity of imaging and visual comfort were improved with MCFI.CONCLUSION MCFI improves biliary visualization and reduces liver fluorescence contamination,which supports its routine use in LC.MCFI may also be a better choice than SCFI in other clinical settings.
基金Project (No. M603034) supported by the Natural Science Foundationof Zhejiang Province, China
文摘Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some color-printing systems. It is difficult, however, to model the composed color with the multiple inks when the number of the output ink hues exceeds three due to the none-unique mapping between the color spaces of the CIE Lab and the multi-color printing device. In this paper, we propose a fine color-printing method for multi-color printing device with the ink set of more than three hues. The proposed approach has good color expression ability and provides fine control of the printed color. By dividing the output color space into several subspaces, our method allows one-to-one mapping between the standard color space and the multi-color output color space. It has been proved effective when applied to the digital inkjet printer—Mutoh8000.
基金Project supported by the National Natural Science Foundation of China(Grant No.11604205)the Talent Program of Shanghai University of Engineering Science,China
文摘We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Com- paring the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump com- ponent and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.
基金Project supported by the National Natural Science Foundation of China(61564007)
文摘Multi-color luminescence basing on amorphous Eu^3＋/Tb^3＋ co-doped Zn-A1 hydroxides and their annealed samples were studied in detail. Results suggest that excellent red emissions due to E^u3＋ and green emissions attributed to Tb^3＋ appear under the excitation of favorable wavelength for all the as- prepared amorphous samples. Moreover, the emission intensity depends on the Eu^3＋/Tb^3＋ molar ratio. The samples annealed at 300, 500, and 700 ℃ still exhibit amorphous state, and multi-color lumi- nescence kept in the samples annealed at 300 ℃, while luminescence quenched for the samples annealed at 500 and 700 ℃. However, a broad emission ranging from 450 to 650 nm occurs in some samples annealed at 900 ℃. Further, the fluorescence decay and lifetimes for the as-prepared samples and the samples annealed at 300℃ were investigated. It is found that all the decay curves of emissions due to Tb^3＋ and Eu^3＋ present characteristic double exponential function despite their different lifetimes. The present work may be a good example for developing new multi-color even white light emitting materials.
基金supported by Beijing Municipal Governmentsupported by the National Natural Science Foundation of China(Grant Nos.61890952)the Director Fund of WNLO。
文摘Manipulating and real-time monitoring of neuronal activities with cell-type specificity and precise spatiotemporal resolution during animal behavior are fundamental technologies for exploring the functional connectivity, information transmission, and physiological functions of neural circuits in vivo. However, current techniques for optogenetic stimulation and neuronal activity recording mostly operate independently. Here, we report an all-fiber-transmission photometry system for simultaneous optogenetic manipulation and multi-color recording of neuronal activities and the neurotransmitter release in a freely moving animal. We have designed and manufactured a wavelength-independent multi-branch fiber bundle to enable simultaneous optogenetic manipulation and multi-color recording at different wavelengths. Further, we combine a laser of narrow linewidth with the lock-in amplification method to suppress the optogenetic stimulation-induced artifacts and channel crosstalk. We show that the collection efficiency of our system outperforms a traditional epi-fluorescence system. Further, we demonstrate successful recording of dynamic dopamine(DA) responses to unexpected rewards in the nucleus accumbens(NAc) in a freely moving mouse. We also show simultaneous dual-color recording of neuronal Ca2+ signals and DA dynamics in the NAc upon delivering an unexpected reward and the simultaneous optogenetic activating at dopaminergic terminals in the same location. Thus, our multi-function fiber photometry system provides a compatible, efficient, and flexible solution for neuroscientists to study neural circuits and neurological diseases.
基金Project supported by the Yunnan Provincial Natural Science Foundation (202101AT070126)the Research Start-up Fund of Chengdu University of Technology (10912-KYQD2020-08476)+1 种基金Fund of Hubei Key Laboratory of Plasma Chemistry,Advanced Materials (KF202103)Sichuan Natural Science Foundation (2022YFH0108,2022JDJQ0030)。
文摘Mechano-luminescence(ML) has been found diverse applications such as stress sensing,3-D signature,energy harvesting,and anti-counterfeiting,due to the unique properties of the corresponding ML phosphors performing in-situ and real-time response to mechanical stimulus.Trap-controlled ML materials realize reproducible,quantitative mechano-optical conversion resulting from the released carriers for the trap-mediated charge storage and release.Herein,modulating traps matters the controllable ML behavior for their promising applications.In this work,a deep trap distributed ranging from 0.9 to 1,3 eV is realized consecutively for the introduction of Sm^(3+)ions into LaGaO_(3) matrix,which contributes to the red emission at 600 nm under mechanical stimuli.Moreover,tunable ML emission modulated from 600to 545 nm is successfully achieved for the codopant of Tb^(3+)ions.It is unambiguously indicated that the released carriers from the trap sharing rather than an additional constructed trap contribute to the modulated ML color.Accordingly,multi-mode anti-counterfeiting and encryption are achieved with the as-explored Sm^(3+),Tb^(3+)co-activated ML phosphor.
基金Key Research and Development Plan of Shaanxi Province,China(No.2023-YBGY-330)。
文摘In an automatic bobbin management system that simultaneously detects bobbin color and residual yarn,a composite texture segmentation and recognition operation based on an odd partial Gabor filter and multi-color space hierarchical clustering are proposed.Firstly,the parameter-optimized odd partial Gabor filter is used to distinguish bobbin and yarn texture,to explore Garbor parameters for yarn bobbins,and to accurately discriminate frequency characteristics of yarns and texture.Secondly,multi-color clustering segmentation using color spaces such as red,green,blue(RGB)and CIELUV(LUV)solves the problems of over-segmentation and segmentation errors,which are caused by the difficulty of accurately representing the complex and variable color information of yarns in a single-color space and the low contrast between the target and background.Finally,the segmented bobbin is combined with the odd partial Gabor’s edge recognition operator to further distinguish bobbin texture from yarn texture and locate the position and size of the residual yarn.Experimental results show that the method is robust in identifying complex texture,damaged and dyed bobbins,and multi-color yarns.Residual yarn identification can distinguish texture features and residual yarns well and it can be transferred to the detection and differentiation of complex texture,which is significantly better than traditional methods.
基金supported by National Natural Science Foundation of China(61975172,82001874 and 61735016).
文摘Fluorescence imaging in the second near-infrared window(NIR-II,900–1880 nm)with less scattering background in biological tissues has been combined with the confocal microscopic system for achieving deep in vivo imaging with high spatial resolution.However,the traditional NIR-IIfluorescence confocal microscope with separate excitation focus and detection pinhole makes it possess low confocal e±ciency,as well as di±cultly to adjust.Two types of upgraded NIR-IIfluorescence confocal microscopes,sharing the same pinhole by excitation and emission focus,leading to higher confocal e±ciency,are built in this work.One type is-ber-pinhole-based confocal microscope applicable to CW laser excitation.It is constructed forfluorescence intensity imaging with large depth,high stabilization and low cost,which could replace multiphotonfluorescence microscopy in some applications(e.g.,cerebrovascular and hepatocellular imaging).The other type is air-pinhole-based confocal microscope applicable to femtosecond(fs)laser excitation.It can be employed not only for NIR-IIfluorescence intensity imaging,but also for multi-channelfluorescence lifetime imaging to recognize different structures with similarfluorescence spectrum.Moreover,it can be facilely combined with multiphotonfluorescence microscopy.A single fs pulsed laser is utilized to achieve up-conversion(visible multiphotonfluorescence)and down-conversion(NIR-II one-photonfluorescence)excitation simultaneously,extending imaging spectral channels,and thus facilitates multi-structure and multi-functional observation.
基金supported by the National Natural Science Foundation of China (62074045, 62074040, 22309134)China Postdoctoral Science Foundation (2022M712402)Shanghai Rising-Star Program (23YF1449200)。
文摘High-resolution organic arrays with diverse pixel types hold significant promise for various applications,such as full-color displays and photonic crystals.The direct growth of such arrays(e.g.,high-resolution multi-color patterns)cannot be achieved in a single step with conventional strategies.Here,we present a viable approach integrating a bottom-up solution strategy with phase-change materials(PCMs),specifically aggregation-induced emission(AIE)materials.Through intentional self-assembly,color-programmable organic micro-patterns featuring distinct phases or colors were created.Notably,manipulating the amount of involved substance for nucleation/crystallization was achieved by adjusting the sizes of pre-defined nucleation sites.This precise control resulted in varied phases and colors for each pixel.Thus,high-resolution organic micro-arrays with transfer-free multi-color pixels were directly achieved.These may open avenues for seamless,transfer-free growth of multifunctional micro-patterns using PCMs,holding immense potential for applications in high-resolution full-color imaging/displays,photonic crystals,information storage,and encryption,etc.
基金the National Natural Science Foundation of China(NSFC:52473195,52303250,and 52073316)Guangdong Basic and Applied Basic Research Foundation(2022B1515020052)Research Foundation of the Department of Education of Guangdong Province(2024KCXTD009).
文摘Purely organic single-component luminescent materials enabling multi-color photoluminescence are gaining significant interest,given their tunable optical properties,environmental friendliness,and cost-effectiveness.However,realizing multi-color electroluminescence from a single-component emitter for application in organic light-emitting diode(OLED)remains challenging,mainly due to the limitations in achieving distinct excited-state conformations in amorphous or solid states.In this study,we report two novel emitters(Bppy-PTZ and Bpph-PTZ)by incorporating a benzophenone acceptor and phenothiazine donor with pyridyl and phenylπ-bridging spacers.The introduction of a pyridine ring in Bppy-PTZ establishes intramolecular hydrogen bonding,stabilizing the quasi-axial(QA)conformation in the amorphous state,thereby facilitating multi-color and white-light emissions in thin-film and OLED devices.Photophysical and theoretical analyses reveal distinct emission behaviors from QA and quasi-equatorial conformations,with Bppy-PTZ exhibiting enhanced dual-emission and mechanochromic properties.Importantly,by adopting single-component Bppy-PTZ,the fabricated OLEDs realize color-tunable emissions,including blue,yellow,and adjustable white lights,reaching maximum external quantum efficiencies of up to 15.5%.This work provides valuable insights for the development of efficient single-component emitters affording multi-color OLEDs with high performances.
基金Supported by the National Natural Science Foundation of China(No.81670837)the Scientific and Technological Project of Tianjin Health Bureau(No.2015KY38)
文摘AIM： To explore the effect of the posterior astigmatism on total corneal astigmatism and evaluate the error caused by substituting the corneal astigmatism of the simulated keratometriy （simulated K） for the total corneal astigmatism in age-related cataract patients. METHODS： A total of 211 eyes with age-related cataract from 164 patients （mean age： 66.8±9.0y, range： 45-83y） were examined using a multi-colored spot reflection topographer, and the total corneal astigmatism was measured. The power vector components J0 and J45 were analyzed. Correlations between the magnitude difference of the simulated K and total cornea astigmatism （magnitude differenceSimK-Tca）, anterior J0, and absolute meridian difference （AMD） between the anterior and posterior astigmatisms were calculated. To compare the astigmatism of the simulated K and total cornea both in magnitude and axial orientation, we drew double-angle plots and calculated the vector difference between the two measures using vector analysis. A corrective regression formula was used to adjust the magnitude of the simulated K astigmatism to approach that of the total cornea. RESULTS： The magnitude differenceSimK-Tca was positively correlated with the anterior corneal J0 （Spearman’s rho= 0.539; P〈0.001） and negatively correlated with the AMDR （Spearman’s rho=-0.875, P〈0.001）. When the anterior J0 value was larger than 1.3 D or smaller than -0.8 D, the errors caused by determining the total corneal astigmatism with the karatometric calculation tended to be greater than 0.25 D. An underestimation by 16% was observed for against the rule （ATR） astigmatism and an overestimation by 9% was observed for with the rule （WTR） astigmatism when ignoring the posterior measurements. CONCLUSION： Posterior corneal astigmatism should be valued for more precise corneal astigmatism management, especially for higher ATR astigmatism of the anterior corneal surface. We suggest a 9% reduction in the magnitude of the simulated K in eyes with WTR astigmatism, and a 16% addition of the magnitude of the simulated K in eyes with ATR astigmatism.
基金the Six Peak Talents Foundation of Jiangsu Province(Nos.XCL-CXTD-009 and XYDXX-019)the National Natural Science Foundation of China(Nos.22075136,21471082,21472186,61874053 and 21272231)+3 种基金Natural Science Funds of the Education Committee of Jiangsu Province(Nos.18KJA510003 and 18KJA430009)Natural Science Foundation of Jiangsu Province(No.BK20200700)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD,No.YX030003)the open research fund from Key Laboratory for Organic Electronics and Information Displays and Qing Lan Project of Jiangsu Province.
文摘A type of novel electrospun supramolecular hybrid microfibers comprising poly(9-(4-(octyloxy)-phenyl)-2,7-fluoren-9-ol)(PPFOH)and poly(A/-vinylcarbazole)(PVK)are successfully prepared for intriguing multi-color emission properties.The supramolecular tunable PPFOH aggregation in PVK matrix endows the complex with a smart energy transfer behavior to obtain the multi-color emissions.In stark contrast to PVK fibers,the emission color of PPFOH/PVK fibers with an efficient dispersion of PPFOH fluorophores at a proper dope ratio can be tuned in a wide spectrum of blue(0.1%),sky blue(0.5%),nearly white(1%),cyan(2%),green(5%)and yellow(10%).Besides,conductive behaviors of the microfiber were demonstrated in accompany with the increment of the doping ratio of PPFOH to PVK.Successful fabrication of polymer light-emitting diode(PLED)based on the blended electrospun fiber provided a further evidence of its excellent electrical property for potential applications in optoelectronic devices.
基金supported by the National Natural Science Foundation of China under Grant No.11273051the program of Light in China Western Region(LCWR,Grant Nos.XBBS201221 and 2015-XBQN-A-02)
文摘This paper presents Charge-Coupled Device time-series photometric observations of the open cluster NGC 1582 and its surrounding field with Johnson B, V and R filters by using the Nanshan 1 m telescope administered by Xinjiang Astronomical Observatory. 19 variable stars and three variable candi- dates were detected in a 45＇ - 48.75＇ field around the cluster. 12 of the variable stars are newly-discovered variable objects. The physical properties, classifications and memberships of these 22 objects are studied through their light curves, their positions on the color-magnitude diagram and with archival data from the Naval Observatory Merged Astrometric Dataset. Among these objects, five are eclipsing binary systems, six are pulsating variable stars including one known 6 Scuti star and one newly-discovered RR Lyrae star. The distance to the RR Lyrae star is estimated to be 7.9 - 0.3 kpc, indicating that the star is located far behind the cluster. Four variable stars are probable members of the cluster, and 13 of the 22 objects are confirmed to be field stars.
基金the National Natural Science Foundation of China(No.21807085)the Natural Science Foundation Research Project of Shaanxi Province(No.2023-JCYB-087)+2 种基金the Technology Innovation Leading Program of Shaanxi(No.2020QFY07-05)the Innovation Capability Support Program of Shaanxi(No.2022KJXX-88)the fund of Education Department of Shaanxi Province(Program No.Z20230071).
文摘Carbon dots(CDs)with aggregation-induced emission(AIE)have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties.However,the preparation of AIE CDs with multicolor solid-state fluorescence remains a formidable challenge due to its complicated construction.In the present work,a novel class of multicolor AIE CDs(M-CDs)were fabricated using selected precursor(salicylic acid,thiosalicylic acid,and 2,2'-dithiodibenzoic acid),with an eco-friendly,low-cost one-pot solvothermal method.In the dilute organic solution,M-CDs manifested blue emission,but upon aggregation in the presence of water,the red,yellow,green,and blue emissions were displayed due to the AIE effect.Structural analysis,coupled with theoretical calculations,revealed that the increase in the size of sp2 domains would lower the Eg and cause a red-shift emission wavelength.Significantly,the continuous emission of M-CDs from blue to red can be utilized as ink for multimode printing,enabling the creation of a variety of school badges and quick response codes.These findings hold promising implications for multi-information encryption applications.
基金supported by National Natural Science Foundation of China (11174004)Higher Educational Natural Science Foundation of Anhui Province (KJ2010A012)
文摘Photoluminescence properties of Sr 2.5 Dy 1/3-x Eu x V 2 O 8（x=0,0.06,0.12,0.18,0.24,0.33） were investigated.The excitation spectra included a broad band in the short wavelength region and several sharp lines in the longer wavelength region,and the spectral origin were discussed.The emission spectra were measured in two different exciting ways,i.e.,exciting the VO 4 group at 270 nm and the Eu 3＋ ion at 398 nm,respectively,and the energy transferring process was reasonably suggested.Furthermore,multi-color emission could be achieved in Sr 2.5 Dy 1/3-x Eu x V 2 O 8,indicating that the studied samples had potential applications in the white light emitting diodes.Further investigation showed that reducing the concentration of Eu 3＋ and Dy 3＋ and introducing Bi 3＋ as a sensitizer ion greatly enhanced the emission intensity.
基金supported by the National Natural Science Foundation of China(52122308,52103239,and 22371110).
文摘Chiral phosphorescent materials have received extensive research owing to the unique properties of optical activity in recent years.Many phosphorescent carbon dots(CDs)materials have been reported,but the research on chiral phosphorescence is still in the exploratory stage.This work designs multi-color room temperature phosphorescent(RTP)CDs with chiral signals,which are fully mixed with aromatic aldehyde precursors and chiral amino compounds precursors in a boric acid(BA)matrix and can be easily prepared by solvent-free thermal method.The prepared(R)-GCDs,(R)-YCDs and(R)-RCDs achieved phosphorescence emission at 545 nm,582 nm,and 654 nm,respectively,and exhibited corresponding circular dichroism(CD)signals at 341 nm,394 nm,384 nm,and 380 nm,448 nm,and 435 nm,respectively.The longest phosphorescence lifetime is up to 946 ms.Specifically,YCDs exhibit time-dependent phosphorescence under UV excitation,and the afterglow time under white light excitation can reach 40 s.This article provides a new approach to the study of chiral phosphorescence.
基金supported by the National Science Foundation(Award No.IIP-2140788)the University of Washington CoMotion Innovation Gap Fund,and the Washington Research Foundation+3 种基金supported by the National Science Foundation through Award No.CMMI-2227285the Science and Technology Center(STC)for Integration of Modern Optoelectronic Materials on Demand(IMOD)under Award No.DMR-2019444supported by the National Science Foundation(NSF)(grant NNCI-1542101)supported by NNCI-2025489 and NNCI-1542101.
文摘A universal method of micro-patterning thin quantum dot films is highly desired by industry to enable the integration of quantum dot materials with optoelectronic devices.Many of the methods reported so far,including specially engineered photoresist or ink-jet printing,are either of poor yield,resolution limited,difficult to scale for mass production,overly expensive,or sacrificing some optical quality of the quantum dots.In our previous work,we presented a dry photolithographic lift-off method for pixelization of solution-processed materials and demonstrated its application in patterning perovskite quantum dot pixels,10μm in diameter,to construct a static micro-display.This report presents further development of this method and demonstrates high-resolution patterning(~1μm diameter),full-scale processing on a 100 mm wafer,and multi-color integration of two different varieties of quantum dots.Perovskite and cadmium-selenide quantum dots were adopted for the experimentation,but the method can be applied to other types of solution-processed materials.We also demonstrate the viability of this method for constructing high-resolution micro-arrays of quantum dot color-convertors by fabricating patterned films directly on top of a blue gallium-nitride LED substrate.The green perovskite quantum dots used for fabrication were synthesized via the room-temperature ligand-assisted reprecipitation method developed by our research group,yielding a photoluminescent quantum yield of 93.6%and full-width half-maximum emission linewidth less than 20 nm.Our results demonstrate the viability of this method for use in scalable manufacturing of high-resolution micro-displays paving the way for improved optoelectronic applications.
