Luminescence thermometry has attracted more and more attention due to its non-contact and noninvasive operation,fast response,high spatial resolution,and so on,for which the luminescent thermometers are the key.Here,a...Luminescence thermometry has attracted more and more attention due to its non-contact and noninvasive operation,fast response,high spatial resolution,and so on,for which the luminescent thermometers are the key.Here,a 1D complex[Tb_(4)(HTC4A)(TC4A)(OBBA)_(2)(CH_(3)OH)_(4)(μ4-OH)]n(1)was obtained by solvothermal synthesis,where H 4TC4A=p-tert-butylthiacalix[4]arene,and H_(2)OBBA=4,4'-oxybisbenzoic acid.This complex is featured with a chain-like polymer constructed by bridging some sandwich-like Tb_(4)-(TC4A)_(2)entities through OBBA2-ligands.It exhibited the characteristic emission of the Tb^(3+)ion.Both fluorescence intensity and lifetime decreased with increasing temperature.The relative sensitivity was up to 8.743%·K^(-1)at 473 K,indicating it is a good ratiometric luminescent thermometer.This complex had good stability under different pH values and in common solvents.CCDC:2392643.展开更多
Stability hinders further development of all-inorganic CsPb X_(3)(X=Cl,Br,I)quantum dots(QDs)although they exhibit promising prospects in optoelectronic applications.Coating perovskite quantum dots(PQDs)with a glass n...Stability hinders further development of all-inorganic CsPb X_(3)(X=Cl,Br,I)quantum dots(QDs)although they exhibit promising prospects in optoelectronic applications.Coating perovskite quantum dots(PQDs)with a glass network to form QD glass can significantly improve their stability.However,the dense glass network degrades their luminescent performance.In this work,the crystallization behavior of PQDs in glass and better luminescence properties are prompted by introducing titanium dioxide into borosilicate glass.The luminescence intensity of TiO_(2)-doped CsPbBr_(3)QD glass is increased by 1.6 times and the PLQY is increased from 49.8%to 79%compared to the undoped glass.Evidence proves that the improved prop-erties are attributed to the enhanced nucleation effect of titanium dioxide during the annealing process.Benefiting from the densification of the glass network caused by titanium dioxide doping,the stability of the PQD glass is further improved.LED devices with an ultra-wide color gamut that fully covers the NTSC1953 standard and achieves 128.6%of the NTSC1953 standard as well as 91.1%of the Rec.2020 stan-dard were fabricated by coupling PQD glass powder,demonstrating promising commercial applications of PQD glass in optoelectronic displays.展开更多
Er^(3+)-doped BaLaGaO_(4)green phosphors was synthesized through a high-temperature solid-state reaction technique.The phase structure and morphology test results of the phosphor indicate that the BaLaGaO_(4)material ...Er^(3+)-doped BaLaGaO_(4)green phosphors was synthesized through a high-temperature solid-state reaction technique.The phase structure and morphology test results of the phosphor indicate that the BaLaGaO_(4)material was successfully synthesized and Er^(3+)ions were successfully doped into the main lattice.This doping does change the basic structure of the crystal.BaLaGaO_(4):Er^(3+)phosphor exhibits bright green emission centered at 545 nm when excited by 381 nm ultraviolet light or 980 nm near-infrared light.The optimal doping concentration is found to be x=0.04.To quantify the temperature sensitivity of the phosphor,the fluorescence intensity ratio method was used.Within the temperature range of 298-473 K,the maximum relative sensitivities are 1.35%/K(298 K,381 nm)and 1.45%/K(298 K,980 nm),respectively.The maximum absolute sensitivities are 0.67%/K(473 K,381 nm)and 0.69%/K(473 K,980 nm),respectively.Finally,white light-emitting diodes(WLEDs)with a high colour index of Ra=82and a relatively low correlated colour temperature of CCT=5064 K are obtained by integrating the synthesized BaLaGaO_(4):0.04Er^(3+)green phosphor into warm WLEDs devices.These results suggest that Er^(3+)-activated BaLaGaO_(4)multifunctional phosphors hold considerable promise in the areas of optical temperature sensing and WLEDs phosphor conversion.展开更多
Biological sensing technology plays a crucial role in various key areas such as disease diagnosis,environmental monitoring,and biotechnology.Luminescent metal-organic frameworks(LMOFs),with their remarkable advantages...Biological sensing technology plays a crucial role in various key areas such as disease diagnosis,environmental monitoring,and biotechnology.Luminescent metal-organic frameworks(LMOFs),with their remarkable advantages including large surface area,customizable pore structures,and highly active functional sites,have emerged as a frontier in biosensor research.This review clarifies the potential of LMOFs in biological sensing applications,with particular emphasis on their efficient performance in detecting amino acids,biomarkers,and drugs,explore the possibility of integrating LMOFs with portable analytical techniques,providing an innovative perspective for advancing luminescence detection technology.Some effective characterization methods to encode these sensing mechanisms including F?rster resonance energy transfer(FRET),photoinduced electron transfer(PET)and thermally activated energy back transfer(BENT)highlighted their connection and difference.Finally,the article summarizes the achievements of LMOFs in biological sensing and provides a perspective on future research directions and potential applications,aiming to propel the continuous development of this field.展开更多
Nowadays,high-quality phosphor-converted white light-emitting diodes(pc-WLEDs)ought to include cyan-emitting phosphors allowing for full-spectrum light similar to sunlight.Herein,we report a garnetstructured Ce^(3+)-d...Nowadays,high-quality phosphor-converted white light-emitting diodes(pc-WLEDs)ought to include cyan-emitting phosphors allowing for full-spectrum light similar to sunlight.Herein,we report a garnetstructured Ce^(3+)-doped SrLu_(2)Ga_(1.5)Al_(2.5)SiO_(12)(SLGASO)phosphor that significantly compensates for the absence of cyan light,known as the"cyan cavity".The SLGASO host crystallizes into a cubic structure with the Ia3d space group.The cell parameters were determined using Rietveld refinement.Under430 nm blue excitation,SLGASO:Ce^(3+)emits intense cyan-green light in the 450-700 nm wavelength range.The representative SLGASO:0.07Ce^(3+)phosphor has an internal quantum efficiency(IQE)of 95.4%and excellent thermal stability,remaining 92.7%of its initial emission intensity at 152℃.After 155 d of immersion in water,the luminous intensity of SLGASO:0.07Ce^(3+)remains constant,confirming its waterproofness.Furthermore,a pc-WLED device with luminous efficiency(LE)of 101.58 lm/W,color rendering index(Ra)of 91,correlated color temperature(CCT)of 4536 K,and Commission Internationale de L'Eclairage(CIE)chromaticity coordinates of(0.3555,0.3390)was fabricated by combining asprepared cyan-green-emitting SLGASO:0.07Ce^(3+),yellow-emitting Y_(3)Al_(5)O_(12):Ce^(3+)(YAG:Ce^(3+)),and redemitting(Ca,Sr)AlSiN_(3):Eu^(2+)phosphors,as well as a 450 nm blue chip.These findings indicate that SLGASO:0.07Ce^(3+)phosphor can bridge the cyan gap and improve the performance of as-fabricated fullvisible-spectrum WLEDs.展开更多
Realizing the point-of-care tumor markers biodetection with good convenience and high sensitivity possesses great significance for prompting cancer monitoring and screening in biomedical study field.Herein,the quantum...Realizing the point-of-care tumor markers biodetection with good convenience and high sensitivity possesses great significance for prompting cancer monitoring and screening in biomedical study field.Herein,the quantum dots luminescence and microfluidic biochip with machine vision algorithm-based intelligent biosensing platform have been designed and manufactured for point-of-care tumor markers diagnostics.The employed quantum dots with excellent photoluminescent performance are modified with specific antibody as the optical labeling agents for the designed sandwich structure immunoassay.The corresponding biosensing investigations of the designed biodetection platform illustrate several advantages involving high sensitivity(~0.021 ng mL^(−1)),outstanding accessibility,and great integrability.Moreover,related test results of human-sourced artificial saliva samples demonstrate better detection capabilities compared with commercially utilized rapid test strips.Combining these infusive abilities,our elaborate biosensing platform is expected to exhibit potential applications for the future point-of-care tumor markers diagnostic area.展开更多
Ln-containing polyoxoniobates(PONbs)have appealing applications in luminescence,information encryption and magnetic fields,but the synthesis of PONbs containing high-nuclearity Ln-O clusters is challenging due to the ...Ln-containing polyoxoniobates(PONbs)have appealing applications in luminescence,information encryption and magnetic fields,but the synthesis of PONbs containing high-nuclearity Ln-O clusters is challenging due to the easy hydrolysis of Ln^(3+)ions in alkaline environments.In this paper,we are able to integrate CO_(3)^(2-)and high-nuclearity Ln-O clusters into PONb to construct an inorganic giant Eu_(19)-embedded PONb H_(49)K_(16)Na_(13)(H_(2)O)_(63)[Eu_(21)O_(2)(OH)_(7)(H_(2)O)_(5)(Nb_(7)O_(22))_(10)(Nb_(2)O_(6))_(2)(CO_(3))_(18)]·91H_(2)O(1),which contains the highest nuclearity Eu-O clusters and the largest number of Eu^(3+)ions among PONbs.In addition,the film that was prepared by mixing 1 with gelatin and glycerol,exhibits reversible luminescence switching behavior under acid/alkali stimulation and has been used to create a fluorescence-encoded information approach.This work paves a feasible strategy for the construction of high-nuclearity Ln-O cluster-containing PONbs and the expansion of the application of Ln-containing PONbs in information encryption.展开更多
The development of multi-stimuli-responsive luminescent system to address emerging demands is essential in anti-counterfeiting field.Herein,a photoswitchable system was reported,which was constructed from photoacid su...The development of multi-stimuli-responsive luminescent system to address emerging demands is essential in anti-counterfeiting field.Herein,a photoswitchable system was reported,which was constructed from photoacid sulfonato-merocyanine(MEH-D)serving as H+donor and diarylethene derivative(DAEA1)as acceptor.After capturing 2 equiv.HCl,the obtained fluorescent molecule DAE-A1-H showed solvatochromic property.Further on,benefiting from that MEH-D released protons and became a ring-closed isomer spiropyran(SP-D)under 440 nm irradiation,DAE-A1 was protonated,turning on fluorescence effect was realized in DAE-A1/MEH-D.In dark,a photo-activated reversible process was realized with SPD changed to MEH-D in situ system.In addition,the OF-DAE-A1-H/SP-D could efficiently and reversibly switch on/off its luminescence upon irradiation by UV–vis light.Significantly,the multi-stimuli-responsive system was successfully applied in logic gate and fluorescence ink,making it an efficient strategy for information encryption and decryption with higher security requirements.展开更多
Lanthanide(Ln^(3+))-doped luminescent nanocrystals(NCs)with excitation and emission in the second near-infrared biological window(NIRII,1000-1700 nm)have attracted considerable attention in the fields of deep-tissue b...Lanthanide(Ln^(3+))-doped luminescent nanocrystals(NCs)with excitation and emission in the second near-infrared biological window(NIRII,1000-1700 nm)have attracted considerable attention in the fields of deep-tissue bioimaging and non-invasive biodetection,owing to their superior advantages including good photochemical stability,sharp emission peaks,large penetration depth,and high signal-to-noise ratio[1].Conventionally,Yb3t-and Nd3t-sensitized NCs have been utilized as NIR-II luminescent nanoprobes for in vivo bioimaging upon excitation with 980 and 808 nm diode laser,respectively[2].展开更多
Recently,it has been observed that during the operation of an inductively coupled plasma(ICP),a luminescent target(BAM,BaMgAl10O17:Eu)can interact with the plasma beam and emit blue light.After excluding the influence...Recently,it has been observed that during the operation of an inductively coupled plasma(ICP),a luminescent target(BAM,BaMgAl10O17:Eu)can interact with the plasma beam and emit blue light.After excluding the influence of ultraviolet(UV)and electromagnetic wave radiation,the results indicate that the BAM target may undergo luminescent excitation due to collisions with electrons and ions.This led us to investigate the physical mechanism behind this plasma luminescence excitation phenomenon.A spectrometer was used to record the luminescent spectroscopy and peak light intensity.Under excitation by argon plasma,the BAM material emits a continuum spectrum from 400 nm to 550 nm,with the peak light intensity located at 462.58 nm,which is the same as the spectrum excited by UV torchlight.To identify the relationship between the plasma parameters and the luminescent intensity,Langmuir and Faraday probes were employed to determine the local plasma parameters such as electron density,electron temperature,and current density.After normalizing the peak light intensity to the plasma parameters,the most interesting point is that the current density is linearly correlated with the luminescent light intensity.To verify the repeatability and lifetime of the plasma-luminescence interaction,a 600 s lifetime test was conducted in a 200 W ICP discharge environment.The maximum difference for the peak light strength of the luminescent spectrum is 6.5%.From a voltage bias experiment and a theoretical derivation,we initially identified that bombardment by ions plays the dominant role in the luminescence excitation process,which also explains the mechanism by which the current density is proportional to the luminescence intensity.This new finding leads us to reconsider the possibility of applying this plasma luminescence phenomenon to optical plasma diagnostics.The BAM light intensity can potentially be used to predict the current density of a plasma beam for large-area two-dimensional(2D)measurements and can capture high spatial resolution in a single test.We believe that this method may lead to high-efficiency,spatially resolved plasma current density measurement.展开更多
Y_(3)Al_(2)Ga_(3)O_(12):Ce^(3+),Cr^(3+)(YAGG:Ce^(3+),Cr^(3+)),as a persistent luminescent material,has advantages of high initial luminescence intensity and long persistent time,which is promising in persistent lumine...Y_(3)Al_(2)Ga_(3)O_(12):Ce^(3+),Cr^(3+)(YAGG:Ce^(3+),Cr^(3+)),as a persistent luminescent material,has advantages of high initial luminescence intensity and long persistent time,which is promising in persistent luminescent material applications.At present,YAGG:Ce^(3+),Cr^(3+)powders exhibit good persistent performance,but their persistent performance of ceramics still needs to be further improved to meet the new requirements.In this work,(Y_(0.998)Ce_(0.002))_(3)(Al_(1-x)Cr_(x))_(2)Ga_(3)O_(12) ceramics with different Cr^(3+)doping concentrations were prepared by solid-state reaction,including air pre-sintering,hot isostatic pressing(HIP)post-treatment and air annealing,to investigate the effects of Cr^(3+)doping concentration on the microstructure,optical properties and persistent performance of the ceramics.The results showed that as the doping concentration of Cr^(3+)increased from 0.025%to 0.2%(in atom),no significant effect of Cr^(3+)concentration on the morphology of pre-sintered ceramics or HIP post-treatment ceramics was observed,but the in-line transmittance gradually increased while the persistent performance gradually decreased.Among them,YAGG:Ce^(3+),Cr^(3+)ceramics doped with 0.025%Cr^(3+)showed the strongest initial luminescence intensity exceeding 6055 mcd/m^(2) and a persistent time of 1030 min after air pre-sintering combined with HIP post-treatment and air annealing.By optimizing the Cr^(3+)doping concentration and the fabrication process,the persistent luminescence(PersL)performance of the YAGG:Ce^(3+),Cr^(3+)ceramics was obviously improved.展开更多
Supramolecular luminescent materials(SLMs)exhibit exceptional luminescence properties and the ability to be intelligently regulated through diverse assembly approaches,making them highly attractive in the field of lum...Supramolecular luminescent materials(SLMs)exhibit exceptional luminescence properties and the ability to be intelligently regulated through diverse assembly approaches,making them highly attractive in the field of luminescent materials.In recent years,the novel macrocyclic arenes characterized by unique electron-rich structures,ease of derivatization,tunable conformations and even inherent luminescence properties afford much opportunities to create such dynamic smart luminescent materials.The incorporation of macrocyclic arenes into SLMs leads to simple preparation process,diverse photophysical phenomena and sophisticated regulatory mechanisms,which is also currently one of the most frontier and hot topics in macrocyclic and supramolecular chemistry and even luminescent materials.In this review,the research advances in construction and applications of SLMs based on macrocyclic arenes in the last several years will be presented from the different assembly strategies,including host-vip complexes,supramolecular polymers,nanoparticles,and other assemblies.Moreover,some insights into future directions for this research area will also be offered.展开更多
The advancement of various types of fluorescent nanoparticles is crucial for enhancing the application of lateral flow immunoassays(LFIA)across multiple fields.Currently,the fluorescent nanoparticles utilized in LFIA ...The advancement of various types of fluorescent nanoparticles is crucial for enhancing the application of lateral flow immunoassays(LFIA)across multiple fields.Currently,the fluorescent nanoparticles utilized in LFIA predominantly consist of traditional dye-doped nanoparticles or aggregation-induced luminescence dye-doped nanoparticles.The reliance on specific types of nanoparticles limits the diversity of signal reporting groups available for LFIA.Herein,we developed a solid-state luminescent dye-doped nanoparticles(SLDNPs)-based LFIA system with exceptional stability for the detection of C-reactive protein(CRP)in serum.The synthesis of SLD_(520)NP_(S)was simplicity,efficient and eco-friendly,which was ideal for large-scale production of the LFIA test strip.And the SLD_(520)NP_(S)exhibits superior fluorescence quantum yield(49%),fully guarantees the performance of the LFIA test strip.The constructed SLD_(520)NPsm Ab1-based LFIA demonstrated a satisfactory linear relationship with CRP concentrations ranging from 0.5 ng/mL to 100 ng/mL,with limits of detection(LOD)of 0.78 ng/mL and a visible LOD of 1 ng/mL using a handheld 405 nm lamp.Furthermore,the developed LFIA exhibited excellent recoveries in serum,ranging from 94.45%to 102.5%.Overall,the outstanding performance of the SLD_(520)NPs-mAb1-based LFIA indicates that solid-state luminescent dyes have significant potential applications in the field of LFIA.展开更多
Eu^(2+)ions'occupancy in a-cordierite structure has been a hot research topic.In this study,Eu^(2+)ions were introduced intoα-Mg_(2)Al_(4)Si_(5)O_(18)structure by glass skeleton modification relaxation crystalliz...Eu^(2+)ions'occupancy in a-cordierite structure has been a hot research topic.In this study,Eu^(2+)ions were introduced intoα-Mg_(2)Al_(4)Si_(5)O_(18)structure by glass skeleton modification relaxation crystallization route,and optimizing Eu^(2+)ions'occupancy was induced by changing the skeleton structure through Al^(3+)content and B^(3+)-P^(5+)double substituting 2Si4+.Three occupied luminescent structures'evolution was verified by combining photo luminescence spectra and lattice parameters.The results show that within the range of Al^(3+)content lower than 1.1 mol or B^(3+)-P^(5+)content higher than 3 mol%,the lattice parameters are dominated by the a/b direction.This is beneficial for Eu^(2+)ions to occupy structural channel sites and Ca^(2+)sites,which forms occupied luminescent structures Eu^(2+)_(vac)and Eu^(2+)_(Ca).When the Al^(3+)content is higher than 1.1 mol or B^(3+)-P^(5+)content is lower than 3 mol%,the lattice parameters are dominated by c direction,which is more conducive to Eu^(2+)ions occupying Mg2+sites and occupied luminescent structure Eu^(2+)_(Mg)formation.By sensitivity calculations,occupancy priority of Eu^(2+)ions are derived as Eu^(2+)_(Ca)>Eu^(2+)_(vac)>Eu^(2+)_(Mg).This study provides an effective strategy to modulate Eu^(2+)occupancy thereby achieving single-component white light emission.展开更多
Lanthanide complex-based materials with magnetic and luminescent properties have received a great deal of attention,owing to their importantly potential applications in diverse fields.In this work,the 9-anthracenecarb...Lanthanide complex-based materials with magnetic and luminescent properties have received a great deal of attention,owing to their importantly potential applications in diverse fields.In this work,the 9-anthracenecarboxylic acid(9-Haca)as bridging ligand was applied in combination with optically activeπ-conjugated 2,4,6-tri(2-pyridyl)-1,3,5-triazine(tptz)to construct a series of new di-nuclear and tetranuclear lanthanide 9-anthracenecarboxylates[La_(2)(9-aca)_(6)(tptz)_(2)(μ-H_(2)O)]·0.25H_(2)O(1),[Ln_(2)(9-aca)_(6)(tptz)_(2)(H_(2)O)_(2)]·0.5AQ·CH_(3)COOH_(2)H_(2)O[Ln=Sm(2a),Eu(2b),Gd(2c),Tb(2d),Dy(2e),Tm(2f);AQ=9,10-anthracenedione]and[Ln_(4)(9-aca)_(10)(tptz)_(2)(CH3COO)2]·H_(2)O[Ln=Eu(3a),Gd(3b),Dy(3c)].1 displays a di-nuclear centrosymmetric moiety[La_(2)(9-aca)_(6)(tptz)_(2)(μ-H_(2)O)]built up from two complex[La(9-aca)_(2)(tptz)]groups bridged by one H_(2)O molecule and two syn-syn-μ2-η1:η1-9-aca-bridging ligands,while 2a-2f are isostructural and co mprise another di-nuclear centrosymmetric moieties[Ln_(2)(9-aca)_(6)(tptz)_(2)(H_(2)O)_(2)]based on two complex[Ln(9-aca)_(2)(tptz)(H_(2)O)]groups connected by two syn-syn-μ2-η1:η1-9-aca-bridging ligands,3a-3c are isostructural and show tetra-nuclear centro symmetric moieties[Ln4(9-aca)10(tptz)2(CH3COO)2]containing three types of coordination modes of 9-aca-ligands.The present compounds offer the only examples of lanthanide 9-anthracenecarboxylates decorated by optically active tptz.Magnetic investigations of 2a,2c-2f,and 3b-3c indicate that 3c is typical of slow relaxation of the magnetization,while 2c and 3b show significant magnetocaloric effect(MCE)with the value of-ΔSm of 5.26 J/(kg·K)at 4 K and 15.65 J/(kg·K)at 2 K(ΔH=7 T),respectively.The luminescent properties were also studied and reveal that the characteristic luminescent properties of the 7r-conjugated aromatic ligands are introduced into magnetic lanthanide 9-anthracenecarboxylates,simultaneously exhibiting slow magnetic relaxation(or MCE)and luminescent properties.展开更多
A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material ...A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material with excellent performance.CaGeO_(3):Tb^(3+)shows LPL emission peak at 442,490.9,548.7,588.5 and 623.8 nm,corresponding to ^(5)D_(3) to^(7)F_(4)and^(5)D_(4)to^(7)F_(J)(J=6,5,4,3)transitions of Tb^(3+).Its CIE coordinates are(0.27,0.50),indicating that the afterglow emission is close to the light of green region.In addition,after the excitation source is turned off,the afterglow time is longer than 90 min.After an interval of 7 h,the photo-stimulation luminescence(PSL)can be observed by using 980 nm laser cyclic excitation.The thermoluminescence(ThL)results show that there are three types of traps in the material and their depths are 0.666,0.774 and 0.892 eV respectively,which are caused by the doping of Tb^(3+).All the results show that CaGeO_(3):Tb^(3+)is an excellent long afterglow luminescent material.展开更多
Herein, the K<sub>3</sub>MoO<sub>2</sub>F<sub>5</sub><sup>.</sup>2H<sub>2</sub>O:Mn<sup>4+</sup> phosphor was synthesized by using low toxic NH&l...Herein, the K<sub>3</sub>MoO<sub>2</sub>F<sub>5</sub><sup>.</sup>2H<sub>2</sub>O:Mn<sup>4+</sup> phosphor was synthesized by using low toxic NH<sub>4</sub>HF<sub>2</sub> and HCl instead of highly toxic HF. The K3</sub>MoO2</sub>F<sub>5</sub><sup>.</sup><sub></sub>2H2</sub>O:Mn4+</sup> phosphor has a blocky structure and exhibits sharp red emission at the range of 580 to 670 nm excited by the blue light at 470 nm. The fabricated WLED device at 20 mA current has low correlation color temperature (CCT = 3608 K) and high color rendering index (Ra = 90.1), which can significantly improve the electroluminescence performance of cold WLED devices. These results indicate that the K3</sub>MoO2</sub>F5</sub><sup>.</sup>2H2</sub>O:Mn4+</sup> phosphor has potential application value in warm WLED excited by blue light chip. .展开更多
Light emitting diode(LED) is the fourth generation lighting source,but it has some shortcomings such as complex chip packaging process and the unbalanced light color of phosphor in long-time application.In this study,...Light emitting diode(LED) is the fourth generation lighting source,but it has some shortcomings such as complex chip packaging process and the unbalanced light color of phosphor in long-time application.In this study,a kind of Eu-terephthalic acid/Tb-sulfosalicylate/ZrO_(2)/ZnZrO_(3)(Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3))phosphor with warm white light emission properties was prepared,and the warm white light LED(wWLEDs) was successfully prepared by encapsulating Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) phosphors together with 270 nm UV-chip.The ZrO_(2)/ZnZrO_(3),Tb-SSA/ZrO_(2)/ZnZrO_(3) and Eu-PTA/ZrO_(2)/ZnZrO_(3) samples show blue emission,green emission and red emission under deep ultraviolet(UV,270 nm) excitation,respectively.The Tb-SSA and Eu-PTA are co-doped into ZrO_(2)/ZnZrO_(3) matrix with blue emission to achieve the warm white light emission,and the light color can be adjusted by controlling the doping amount of Eu^(3+)-and Tb^(3+).Through the excitation method of single-component phosphor by the single chip,the complex chip packaging process of w-LED can be solved.By doping rare earth organic complexes into porous ZrO_(2)/ZnZrO_(3) matrix,the problems of the light color unbalanced of phosphor and the low luminescence intensity of rare earth doped metal oxides composites can be solved.展开更多
文摘Luminescence thermometry has attracted more and more attention due to its non-contact and noninvasive operation,fast response,high spatial resolution,and so on,for which the luminescent thermometers are the key.Here,a 1D complex[Tb_(4)(HTC4A)(TC4A)(OBBA)_(2)(CH_(3)OH)_(4)(μ4-OH)]n(1)was obtained by solvothermal synthesis,where H 4TC4A=p-tert-butylthiacalix[4]arene,and H_(2)OBBA=4,4'-oxybisbenzoic acid.This complex is featured with a chain-like polymer constructed by bridging some sandwich-like Tb_(4)-(TC4A)_(2)entities through OBBA2-ligands.It exhibited the characteristic emission of the Tb^(3+)ion.Both fluorescence intensity and lifetime decreased with increasing temperature.The relative sensitivity was up to 8.743%·K^(-1)at 473 K,indicating it is a good ratiometric luminescent thermometer.This complex had good stability under different pH values and in common solvents.CCDC:2392643.
基金sponsored by the Hengdian Group Holding Co.LTDsupported by the joint fund from Hengdian Group and Shanghai Institute of Ceram-ics,Chinese Academy of Sciences
文摘Stability hinders further development of all-inorganic CsPb X_(3)(X=Cl,Br,I)quantum dots(QDs)although they exhibit promising prospects in optoelectronic applications.Coating perovskite quantum dots(PQDs)with a glass network to form QD glass can significantly improve their stability.However,the dense glass network degrades their luminescent performance.In this work,the crystallization behavior of PQDs in glass and better luminescence properties are prompted by introducing titanium dioxide into borosilicate glass.The luminescence intensity of TiO_(2)-doped CsPbBr_(3)QD glass is increased by 1.6 times and the PLQY is increased from 49.8%to 79%compared to the undoped glass.Evidence proves that the improved prop-erties are attributed to the enhanced nucleation effect of titanium dioxide during the annealing process.Benefiting from the densification of the glass network caused by titanium dioxide doping,the stability of the PQD glass is further improved.LED devices with an ultra-wide color gamut that fully covers the NTSC1953 standard and achieves 128.6%of the NTSC1953 standard as well as 91.1%of the Rec.2020 stan-dard were fabricated by coupling PQD glass powder,demonstrating promising commercial applications of PQD glass in optoelectronic displays.
基金supported by the National Natural Science Foundation of China(52403403)Guizhou Provincial Basic Research Program(Natural Science)(Qian ke he ji chu-ZK2024 YiBan 095)。
文摘Er^(3+)-doped BaLaGaO_(4)green phosphors was synthesized through a high-temperature solid-state reaction technique.The phase structure and morphology test results of the phosphor indicate that the BaLaGaO_(4)material was successfully synthesized and Er^(3+)ions were successfully doped into the main lattice.This doping does change the basic structure of the crystal.BaLaGaO_(4):Er^(3+)phosphor exhibits bright green emission centered at 545 nm when excited by 381 nm ultraviolet light or 980 nm near-infrared light.The optimal doping concentration is found to be x=0.04.To quantify the temperature sensitivity of the phosphor,the fluorescence intensity ratio method was used.Within the temperature range of 298-473 K,the maximum relative sensitivities are 1.35%/K(298 K,381 nm)and 1.45%/K(298 K,980 nm),respectively.The maximum absolute sensitivities are 0.67%/K(473 K,381 nm)and 0.69%/K(473 K,980 nm),respectively.Finally,white light-emitting diodes(WLEDs)with a high colour index of Ra=82and a relatively low correlated colour temperature of CCT=5064 K are obtained by integrating the synthesized BaLaGaO_(4):0.04Er^(3+)green phosphor into warm WLEDs devices.These results suggest that Er^(3+)-activated BaLaGaO_(4)multifunctional phosphors hold considerable promise in the areas of optical temperature sensing and WLEDs phosphor conversion.
基金supported financially by Natural Science Foundation of Tianjin(No.18JCYBJC89700)Science&Technology Development Fund of Tianjin Education Commission for Higher Education(No.2019ZD15)。
文摘Biological sensing technology plays a crucial role in various key areas such as disease diagnosis,environmental monitoring,and biotechnology.Luminescent metal-organic frameworks(LMOFs),with their remarkable advantages including large surface area,customizable pore structures,and highly active functional sites,have emerged as a frontier in biosensor research.This review clarifies the potential of LMOFs in biological sensing applications,with particular emphasis on their efficient performance in detecting amino acids,biomarkers,and drugs,explore the possibility of integrating LMOFs with portable analytical techniques,providing an innovative perspective for advancing luminescence detection technology.Some effective characterization methods to encode these sensing mechanisms including F?rster resonance energy transfer(FRET),photoinduced electron transfer(PET)and thermally activated energy back transfer(BENT)highlighted their connection and difference.Finally,the article summarizes the achievements of LMOFs in biological sensing and provides a perspective on future research directions and potential applications,aiming to propel the continuous development of this field.
基金supported by the National Natural Science Foundations of China(21801254,52002411,52272174,22205017,U1301242)China Postdoctoral Science Foundation(2022M720400,2023M743978)+1 种基金Specialized Research Fund for the Doctoral Program of Higher Education of China(20130171130001)the Ministry of Science,Technological Development,and Innovation of the Republic of Serbia(451-03-66/2024-03/200017)。
文摘Nowadays,high-quality phosphor-converted white light-emitting diodes(pc-WLEDs)ought to include cyan-emitting phosphors allowing for full-spectrum light similar to sunlight.Herein,we report a garnetstructured Ce^(3+)-doped SrLu_(2)Ga_(1.5)Al_(2.5)SiO_(12)(SLGASO)phosphor that significantly compensates for the absence of cyan light,known as the"cyan cavity".The SLGASO host crystallizes into a cubic structure with the Ia3d space group.The cell parameters were determined using Rietveld refinement.Under430 nm blue excitation,SLGASO:Ce^(3+)emits intense cyan-green light in the 450-700 nm wavelength range.The representative SLGASO:0.07Ce^(3+)phosphor has an internal quantum efficiency(IQE)of 95.4%and excellent thermal stability,remaining 92.7%of its initial emission intensity at 152℃.After 155 d of immersion in water,the luminous intensity of SLGASO:0.07Ce^(3+)remains constant,confirming its waterproofness.Furthermore,a pc-WLED device with luminous efficiency(LE)of 101.58 lm/W,color rendering index(Ra)of 91,correlated color temperature(CCT)of 4536 K,and Commission Internationale de L'Eclairage(CIE)chromaticity coordinates of(0.3555,0.3390)was fabricated by combining asprepared cyan-green-emitting SLGASO:0.07Ce^(3+),yellow-emitting Y_(3)Al_(5)O_(12):Ce^(3+)(YAG:Ce^(3+)),and redemitting(Ca,Sr)AlSiN_(3):Eu^(2+)phosphors,as well as a 450 nm blue chip.These findings indicate that SLGASO:0.07Ce^(3+)phosphor can bridge the cyan gap and improve the performance of as-fabricated fullvisible-spectrum WLEDs.
基金supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.CRF No.PolyU C5110-20G)PolyU Grants(1-CE0H,1-W30M,1-CD4S).
文摘Realizing the point-of-care tumor markers biodetection with good convenience and high sensitivity possesses great significance for prompting cancer monitoring and screening in biomedical study field.Herein,the quantum dots luminescence and microfluidic biochip with machine vision algorithm-based intelligent biosensing platform have been designed and manufactured for point-of-care tumor markers diagnostics.The employed quantum dots with excellent photoluminescent performance are modified with specific antibody as the optical labeling agents for the designed sandwich structure immunoassay.The corresponding biosensing investigations of the designed biodetection platform illustrate several advantages involving high sensitivity(~0.021 ng mL^(−1)),outstanding accessibility,and great integrability.Moreover,related test results of human-sourced artificial saliva samples demonstrate better detection capabilities compared with commercially utilized rapid test strips.Combining these infusive abilities,our elaborate biosensing platform is expected to exhibit potential applications for the future point-of-care tumor markers diagnostic area.
基金the financial support from the National Natural Science Foundation of China(Nos.21971040,22171045,and 22371046)。
文摘Ln-containing polyoxoniobates(PONbs)have appealing applications in luminescence,information encryption and magnetic fields,but the synthesis of PONbs containing high-nuclearity Ln-O clusters is challenging due to the easy hydrolysis of Ln^(3+)ions in alkaline environments.In this paper,we are able to integrate CO_(3)^(2-)and high-nuclearity Ln-O clusters into PONb to construct an inorganic giant Eu_(19)-embedded PONb H_(49)K_(16)Na_(13)(H_(2)O)_(63)[Eu_(21)O_(2)(OH)_(7)(H_(2)O)_(5)(Nb_(7)O_(22))_(10)(Nb_(2)O_(6))_(2)(CO_(3))_(18)]·91H_(2)O(1),which contains the highest nuclearity Eu-O clusters and the largest number of Eu^(3+)ions among PONbs.In addition,the film that was prepared by mixing 1 with gelatin and glycerol,exhibits reversible luminescence switching behavior under acid/alkali stimulation and has been used to create a fluorescence-encoded information approach.This work paves a feasible strategy for the construction of high-nuclearity Ln-O cluster-containing PONbs and the expansion of the application of Ln-containing PONbs in information encryption.
基金financially supported by Natural Science Foundation of Shandong Province(Nos.ZR2022QB061,2022KJ181)National Key R&D Program of China(No.2023YFD1700903)。
文摘The development of multi-stimuli-responsive luminescent system to address emerging demands is essential in anti-counterfeiting field.Herein,a photoswitchable system was reported,which was constructed from photoacid sulfonato-merocyanine(MEH-D)serving as H+donor and diarylethene derivative(DAEA1)as acceptor.After capturing 2 equiv.HCl,the obtained fluorescent molecule DAE-A1-H showed solvatochromic property.Further on,benefiting from that MEH-D released protons and became a ring-closed isomer spiropyran(SP-D)under 440 nm irradiation,DAE-A1 was protonated,turning on fluorescence effect was realized in DAE-A1/MEH-D.In dark,a photo-activated reversible process was realized with SPD changed to MEH-D in situ system.In addition,the OF-DAE-A1-H/SP-D could efficiently and reversibly switch on/off its luminescence upon irradiation by UV–vis light.Significantly,the multi-stimuli-responsive system was successfully applied in logic gate and fluorescence ink,making it an efficient strategy for information encryption and decryption with higher security requirements.
基金supported by the National Natural Science Foundation of China(Nos.12474418,U22A20398,and 22135008).
文摘Lanthanide(Ln^(3+))-doped luminescent nanocrystals(NCs)with excitation and emission in the second near-infrared biological window(NIRII,1000-1700 nm)have attracted considerable attention in the fields of deep-tissue bioimaging and non-invasive biodetection,owing to their superior advantages including good photochemical stability,sharp emission peaks,large penetration depth,and high signal-to-noise ratio[1].Conventionally,Yb3t-and Nd3t-sensitized NCs have been utilized as NIR-II luminescent nanoprobes for in vivo bioimaging upon excitation with 980 and 808 nm diode laser,respectively[2].
基金partly supported by National Natural Science Foundation of China(Nos.52302464 and 52177128)supported by the Key Scientific Research Project for Institutions of Higher Education of Henan Province(No.22B140002).
文摘Recently,it has been observed that during the operation of an inductively coupled plasma(ICP),a luminescent target(BAM,BaMgAl10O17:Eu)can interact with the plasma beam and emit blue light.After excluding the influence of ultraviolet(UV)and electromagnetic wave radiation,the results indicate that the BAM target may undergo luminescent excitation due to collisions with electrons and ions.This led us to investigate the physical mechanism behind this plasma luminescence excitation phenomenon.A spectrometer was used to record the luminescent spectroscopy and peak light intensity.Under excitation by argon plasma,the BAM material emits a continuum spectrum from 400 nm to 550 nm,with the peak light intensity located at 462.58 nm,which is the same as the spectrum excited by UV torchlight.To identify the relationship between the plasma parameters and the luminescent intensity,Langmuir and Faraday probes were employed to determine the local plasma parameters such as electron density,electron temperature,and current density.After normalizing the peak light intensity to the plasma parameters,the most interesting point is that the current density is linearly correlated with the luminescent light intensity.To verify the repeatability and lifetime of the plasma-luminescence interaction,a 600 s lifetime test was conducted in a 200 W ICP discharge environment.The maximum difference for the peak light strength of the luminescent spectrum is 6.5%.From a voltage bias experiment and a theoretical derivation,we initially identified that bombardment by ions plays the dominant role in the luminescence excitation process,which also explains the mechanism by which the current density is proportional to the luminescence intensity.This new finding leads us to reconsider the possibility of applying this plasma luminescence phenomenon to optical plasma diagnostics.The BAM light intensity can potentially be used to predict the current density of a plasma beam for large-area two-dimensional(2D)measurements and can capture high spatial resolution in a single test.We believe that this method may lead to high-efficiency,spatially resolved plasma current density measurement.
基金National Key R&D Program of China(2023YFB3506600)。
文摘Y_(3)Al_(2)Ga_(3)O_(12):Ce^(3+),Cr^(3+)(YAGG:Ce^(3+),Cr^(3+)),as a persistent luminescent material,has advantages of high initial luminescence intensity and long persistent time,which is promising in persistent luminescent material applications.At present,YAGG:Ce^(3+),Cr^(3+)powders exhibit good persistent performance,but their persistent performance of ceramics still needs to be further improved to meet the new requirements.In this work,(Y_(0.998)Ce_(0.002))_(3)(Al_(1-x)Cr_(x))_(2)Ga_(3)O_(12) ceramics with different Cr^(3+)doping concentrations were prepared by solid-state reaction,including air pre-sintering,hot isostatic pressing(HIP)post-treatment and air annealing,to investigate the effects of Cr^(3+)doping concentration on the microstructure,optical properties and persistent performance of the ceramics.The results showed that as the doping concentration of Cr^(3+)increased from 0.025%to 0.2%(in atom),no significant effect of Cr^(3+)concentration on the morphology of pre-sintered ceramics or HIP post-treatment ceramics was observed,but the in-line transmittance gradually increased while the persistent performance gradually decreased.Among them,YAGG:Ce^(3+),Cr^(3+)ceramics doped with 0.025%Cr^(3+)showed the strongest initial luminescence intensity exceeding 6055 mcd/m^(2) and a persistent time of 1030 min after air pre-sintering combined with HIP post-treatment and air annealing.By optimizing the Cr^(3+)doping concentration and the fabrication process,the persistent luminescence(PersL)performance of the YAGG:Ce^(3+),Cr^(3+)ceramics was obviously improved.
基金the National Natural Science Foundation of China(Nos.22171272,22031010)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB0520302)the Youth Innovation Promotion Association CAS(No.2021035)for financial support。
文摘Supramolecular luminescent materials(SLMs)exhibit exceptional luminescence properties and the ability to be intelligently regulated through diverse assembly approaches,making them highly attractive in the field of luminescent materials.In recent years,the novel macrocyclic arenes characterized by unique electron-rich structures,ease of derivatization,tunable conformations and even inherent luminescence properties afford much opportunities to create such dynamic smart luminescent materials.The incorporation of macrocyclic arenes into SLMs leads to simple preparation process,diverse photophysical phenomena and sophisticated regulatory mechanisms,which is also currently one of the most frontier and hot topics in macrocyclic and supramolecular chemistry and even luminescent materials.In this review,the research advances in construction and applications of SLMs based on macrocyclic arenes in the last several years will be presented from the different assembly strategies,including host-vip complexes,supramolecular polymers,nanoparticles,and other assemblies.Moreover,some insights into future directions for this research area will also be offered.
基金supported by the National Natural Science Foundation of China(Nos.22064014,21765013)the Science and Technology Development Plan Project of Lanzhou(No.20211-146)+3 种基金the Science and Technology Project of Gansu Province(Nos.21YF5FA071,21JR7RA538)the Industrial Support Programme for Higher Education Institutions Project(Nos.2023CYZC-69,2024CYCZ-05)the 2023 Gansu Provincial Key Talent Project(No.2023RCXM26)a Gansu province postdoctoral grant(No.00247)。
文摘The advancement of various types of fluorescent nanoparticles is crucial for enhancing the application of lateral flow immunoassays(LFIA)across multiple fields.Currently,the fluorescent nanoparticles utilized in LFIA predominantly consist of traditional dye-doped nanoparticles or aggregation-induced luminescence dye-doped nanoparticles.The reliance on specific types of nanoparticles limits the diversity of signal reporting groups available for LFIA.Herein,we developed a solid-state luminescent dye-doped nanoparticles(SLDNPs)-based LFIA system with exceptional stability for the detection of C-reactive protein(CRP)in serum.The synthesis of SLD_(520)NP_(S)was simplicity,efficient and eco-friendly,which was ideal for large-scale production of the LFIA test strip.And the SLD_(520)NP_(S)exhibits superior fluorescence quantum yield(49%),fully guarantees the performance of the LFIA test strip.The constructed SLD_(520)NPsm Ab1-based LFIA demonstrated a satisfactory linear relationship with CRP concentrations ranging from 0.5 ng/mL to 100 ng/mL,with limits of detection(LOD)of 0.78 ng/mL and a visible LOD of 1 ng/mL using a handheld 405 nm lamp.Furthermore,the developed LFIA exhibited excellent recoveries in serum,ranging from 94.45%to 102.5%.Overall,the outstanding performance of the SLD_(520)NPs-mAb1-based LFIA indicates that solid-state luminescent dyes have significant potential applications in the field of LFIA.
基金Project supported by Anhui Natural Science(1808085ME136)。
文摘Eu^(2+)ions'occupancy in a-cordierite structure has been a hot research topic.In this study,Eu^(2+)ions were introduced intoα-Mg_(2)Al_(4)Si_(5)O_(18)structure by glass skeleton modification relaxation crystallization route,and optimizing Eu^(2+)ions'occupancy was induced by changing the skeleton structure through Al^(3+)content and B^(3+)-P^(5+)double substituting 2Si4+.Three occupied luminescent structures'evolution was verified by combining photo luminescence spectra and lattice parameters.The results show that within the range of Al^(3+)content lower than 1.1 mol or B^(3+)-P^(5+)content higher than 3 mol%,the lattice parameters are dominated by the a/b direction.This is beneficial for Eu^(2+)ions to occupy structural channel sites and Ca^(2+)sites,which forms occupied luminescent structures Eu^(2+)_(vac)and Eu^(2+)_(Ca).When the Al^(3+)content is higher than 1.1 mol or B^(3+)-P^(5+)content is lower than 3 mol%,the lattice parameters are dominated by c direction,which is more conducive to Eu^(2+)ions occupying Mg2+sites and occupied luminescent structure Eu^(2+)_(Mg)formation.By sensitivity calculations,occupancy priority of Eu^(2+)ions are derived as Eu^(2+)_(Ca)>Eu^(2+)_(vac)>Eu^(2+)_(Mg).This study provides an effective strategy to modulate Eu^(2+)occupancy thereby achieving single-component white light emission.
基金Project supported by the National Natural Science Foundation of China(21671029)Innovation andEntrepreneurship Team of Inorganic Optoelectronic Functional Materials for Chongqing Yingcai(cstc2021ycjh-bgzxm0131)+3 种基金MajorProject of the Science and Technology Research Program of Chongqing Education Commission of China(KJZD-M202100501)theInnovation Program for Chongqing’s Overseas Returnees(cx2019037)Natural Science Foundation of Chongqing,China(cstc2021jcyj-msxmX0380)Chongqing Normal University(21XLB034)。
文摘Lanthanide complex-based materials with magnetic and luminescent properties have received a great deal of attention,owing to their importantly potential applications in diverse fields.In this work,the 9-anthracenecarboxylic acid(9-Haca)as bridging ligand was applied in combination with optically activeπ-conjugated 2,4,6-tri(2-pyridyl)-1,3,5-triazine(tptz)to construct a series of new di-nuclear and tetranuclear lanthanide 9-anthracenecarboxylates[La_(2)(9-aca)_(6)(tptz)_(2)(μ-H_(2)O)]·0.25H_(2)O(1),[Ln_(2)(9-aca)_(6)(tptz)_(2)(H_(2)O)_(2)]·0.5AQ·CH_(3)COOH_(2)H_(2)O[Ln=Sm(2a),Eu(2b),Gd(2c),Tb(2d),Dy(2e),Tm(2f);AQ=9,10-anthracenedione]and[Ln_(4)(9-aca)_(10)(tptz)_(2)(CH3COO)2]·H_(2)O[Ln=Eu(3a),Gd(3b),Dy(3c)].1 displays a di-nuclear centrosymmetric moiety[La_(2)(9-aca)_(6)(tptz)_(2)(μ-H_(2)O)]built up from two complex[La(9-aca)_(2)(tptz)]groups bridged by one H_(2)O molecule and two syn-syn-μ2-η1:η1-9-aca-bridging ligands,while 2a-2f are isostructural and co mprise another di-nuclear centrosymmetric moieties[Ln_(2)(9-aca)_(6)(tptz)_(2)(H_(2)O)_(2)]based on two complex[Ln(9-aca)_(2)(tptz)(H_(2)O)]groups connected by two syn-syn-μ2-η1:η1-9-aca-bridging ligands,3a-3c are isostructural and show tetra-nuclear centro symmetric moieties[Ln4(9-aca)10(tptz)2(CH3COO)2]containing three types of coordination modes of 9-aca-ligands.The present compounds offer the only examples of lanthanide 9-anthracenecarboxylates decorated by optically active tptz.Magnetic investigations of 2a,2c-2f,and 3b-3c indicate that 3c is typical of slow relaxation of the magnetization,while 2c and 3b show significant magnetocaloric effect(MCE)with the value of-ΔSm of 5.26 J/(kg·K)at 4 K and 15.65 J/(kg·K)at 2 K(ΔH=7 T),respectively.The luminescent properties were also studied and reveal that the characteristic luminescent properties of the 7r-conjugated aromatic ligands are introduced into magnetic lanthanide 9-anthracenecarboxylates,simultaneously exhibiting slow magnetic relaxation(or MCE)and luminescent properties.
基金Project supported by the State Key Research Projects of Shandong Natural Science Foundation(ZR2020KB019)the fund of"Two-Hundred Talent"Plan of Yantai City+1 种基金the National Natural Science Foundation of China(11974013)the Natural Science Foundation of Fujian Province(2022J011270)。
文摘A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material with excellent performance.CaGeO_(3):Tb^(3+)shows LPL emission peak at 442,490.9,548.7,588.5 and 623.8 nm,corresponding to ^(5)D_(3) to^(7)F_(4)and^(5)D_(4)to^(7)F_(J)(J=6,5,4,3)transitions of Tb^(3+).Its CIE coordinates are(0.27,0.50),indicating that the afterglow emission is close to the light of green region.In addition,after the excitation source is turned off,the afterglow time is longer than 90 min.After an interval of 7 h,the photo-stimulation luminescence(PSL)can be observed by using 980 nm laser cyclic excitation.The thermoluminescence(ThL)results show that there are three types of traps in the material and their depths are 0.666,0.774 and 0.892 eV respectively,which are caused by the doping of Tb^(3+).All the results show that CaGeO_(3):Tb^(3+)is an excellent long afterglow luminescent material.
文摘Herein, the K<sub>3</sub>MoO<sub>2</sub>F<sub>5</sub><sup>.</sup>2H<sub>2</sub>O:Mn<sup>4+</sup> phosphor was synthesized by using low toxic NH<sub>4</sub>HF<sub>2</sub> and HCl instead of highly toxic HF. The K3</sub>MoO2</sub>F<sub>5</sub><sup>.</sup><sub></sub>2H2</sub>O:Mn4+</sup> phosphor has a blocky structure and exhibits sharp red emission at the range of 580 to 670 nm excited by the blue light at 470 nm. The fabricated WLED device at 20 mA current has low correlation color temperature (CCT = 3608 K) and high color rendering index (Ra = 90.1), which can significantly improve the electroluminescence performance of cold WLED devices. These results indicate that the K3</sub>MoO2</sub>F5</sub><sup>.</sup>2H2</sub>O:Mn4+</sup> phosphor has potential application value in warm WLED excited by blue light chip. .
基金supported by the National Natural Science Foundation of China (51572034)the Jilin Province Science and Technology Development Plan Project of China (20220203168SF)。
文摘Light emitting diode(LED) is the fourth generation lighting source,but it has some shortcomings such as complex chip packaging process and the unbalanced light color of phosphor in long-time application.In this study,a kind of Eu-terephthalic acid/Tb-sulfosalicylate/ZrO_(2)/ZnZrO_(3)(Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3))phosphor with warm white light emission properties was prepared,and the warm white light LED(wWLEDs) was successfully prepared by encapsulating Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) phosphors together with 270 nm UV-chip.The ZrO_(2)/ZnZrO_(3),Tb-SSA/ZrO_(2)/ZnZrO_(3) and Eu-PTA/ZrO_(2)/ZnZrO_(3) samples show blue emission,green emission and red emission under deep ultraviolet(UV,270 nm) excitation,respectively.The Tb-SSA and Eu-PTA are co-doped into ZrO_(2)/ZnZrO_(3) matrix with blue emission to achieve the warm white light emission,and the light color can be adjusted by controlling the doping amount of Eu^(3+)-and Tb^(3+).Through the excitation method of single-component phosphor by the single chip,the complex chip packaging process of w-LED can be solved.By doping rare earth organic complexes into porous ZrO_(2)/ZnZrO_(3) matrix,the problems of the light color unbalanced of phosphor and the low luminescence intensity of rare earth doped metal oxides composites can be solved.
