Dynamic fluorescent materials capable of stimulus-responsive emission modulation have emerged as pivotal components in next-generation information security systems.This study presents a novel photoresponsive fluoresce...Dynamic fluorescent materials capable of stimulus-responsive emission modulation have emerged as pivotal components in next-generation information security systems.This study presents a novel photoresponsive fluorescent composite system in which spiropyran(SP)was covalently grafted onto naphthalimide-functionalized silica aerogel matrices.These architectures exhibit reversible fluorescence resonance energy transfer between the naphthalimide donors and merocyanine-form of SP acceptors under ultraviolet irradiation,enabling dynamic emission shifting from green(blue)to red.The aggregation-induced emission characteristics of SP were used to engineer a smart material system that can reversibly regulate its distinct red fluorescence by precisely controlling the dispersion of amino groups on naphthalimide-functionalized silica aerogels.This spatial manipulation directly governs the molecular packing state of SP,enabling dynamic fluorescence modulation.A programmable control over the fluorescence chromatic transitions in the composite material was achieved by systematically adjusting the SP grafting densities(1%,2%,and 3%w/w).A unique mode of dynamic information encryption technology was developed by utilizing dynamic fluorescence variations.These materials can substantially enhance information encryption levels due to their precisely adjustable fluorescence properties in response to external stimuli over time.This makes the encryption process even more unpredictable and complex,thereby exponentially increasing the difficulty for unauthorized parties to replicate or decode the encrypted information.展开更多
It is attractive and encouraging to develop new fluorescent carbon dots(CDs)with excellent optical properties and promising applications prospects.Herein,highly-efficient green emissive CDs(m-CDs)with a high quantum y...It is attractive and encouraging to develop new fluorescent carbon dots(CDs)with excellent optical properties and promising applications prospects.Herein,highly-efficient green emissive CDs(m-CDs)with a high quantum yield(QY)of 71.7%in water are prepared through a facile solvothermal method.Interestingly,the m-CDs exhibit excellent fluorescence stability in the pH range of 1–9.However,the fluorescence intensity of the m-CDs is almost completely quenched as the pH is increased from 9 to 10.The mechanism of the unique pH-responsive behavior is discussed in detail and a plausible mechanism is proposed.Owing to the unique pH-responsive behavior,the m-CDs are used as a on-off fluorescent probe for water quality identification.By combining the reversible pH-ultrasensitive optical properties of the m-CDs in the pH range of 9–10 with the glucose oxidase-mimicking(GOx-mimicking)ability of Au nanoparticles(AuNPs),glucose can be quantitatively detected.Finally,two environment-friendly starch-based solid-state fluorescence materials(powder and film)are developed through green preparation routes.展开更多
Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source....Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source. The experiment of the emission and excitation optical spectrum, decay curve of fluorescence and residuals for several sensitive materials confirms the match of Y2O2S:Eu using the light source and the feasibility of the system. The rare earth material Y2O2S:Eu is selected as the material candidate for being the most sensitive.展开更多
Chirality is an important natural characteristic of organic molecules,and chiral organic molecules have shown extensive application in areas such as pharmaceutical development and material science.Benefiting from the ...Chirality is an important natural characteristic of organic molecules,and chiral organic molecules have shown extensive application in areas such as pharmaceutical development and material science.Benefiting from the ability to achieve circularly polarized luminescence(CPL),chiral luminescent materials have shown potential applications in anti-glare display,optical communication and,3D display,etc.Due to the ability to harvest both singlet and triplet excitons by a fast reverse intersystem crossing process without involving noble metals,chiral thermally activated delayed fluorescence(TADF)materials with point chirality,axial chirality,planar chirality and helical chirality are regarded as the state-of-the-art materials for circularly polarized organic light-emitting diodes(CP-OLEDs).In recent years,the chiral TADF materials and CP-OLEDs have rapidly developed,but unfortunately,the dissymmetry factors(g)are far from the requirement of practical applications.The ideal emitters and devices should have both high efficiency and a g factor,or at least a balance between these two elements.This review gives an overview of recent progress in chiral TADF materials,with a particular focus on the chiral skeleton,CPL property and device performance.Furthermore,the molecular design concept,device structure and methods to improve the g factors of chiral materials and CP-OLEDs are also discussed.展开更多
Two novel thieno-[3,4-b]-pyrazine-based molecules, TP-E and TP-O, were designed and synthesized for potential application as red fluorescent emitters. The bulky tetraphenylethylene groups were attached at the peripher...Two novel thieno-[3,4-b]-pyrazine-based molecules, TP-E and TP-O, were designed and synthesized for potential application as red fluorescent emitters. The bulky tetraphenylethylene groups were attached at the periphery of the thieno-[3,4-b]-pyrazine core to form the non-planar molecules, as efficient solid- state emitting materials. The peripheral groups were grafted to the emissive core through either a conjugated acetylene bond, or a non-conjugated ether bond. These molecules exhibit strnng red fluorescence in both dilute solutions and in thin films with large Stokes shifts of over 100 nm. The cyclic voltammetry measurements showed the reversible oxidation and reduction behavior for both compounds. All these properties indicate the two compounds are possible functional materials for use in ontoelectronic devices.展开更多
Fluorescence material of Sm doped Si-Ca-Mg system was synthesized by using the method of solid phase reaction at high temperature. The phase composition and crystal structure of this material were analyzed with XRD me...Fluorescence material of Sm doped Si-Ca-Mg system was synthesized by using the method of solid phase reaction at high temperature. The phase composition and crystal structure of this material were analyzed with XRD method for its composition and the existence form of Sm atom. We aimed to exactly determine the phase composition of this fluorescence material and the doping position and environment of rare-earth Sm atom in the system because these factors have significant effects on the properties. The analytical results show that the Sm atoms dope in Ca2O26Si6Sm8 lattice in the form of atomic site-occupation in three different space positions with different occupancy rates. Therefore, based on the XRD analytical results, the fluorescence material of Sm doped Si-Ca-Mg system with high performance can be synthesized.展开更多
During past few years,the construction of fluorescent metallacycles featuring the fluorescenceresonance energy transfer behavior has attracted extensive attention due to their diverse applications such as real-time mo...During past few years,the construction of fluorescent metallacycles featuring the fluorescenceresonance energy transfer behavior has attracted extensive attention due to their diverse applications such as real-time monitoring the dynamics of coordination-driven self-assembly,photoswitching fluorescence-resonance energy transfer,and light-controlled generation of singlet oxygen for cancer therapy.This review focuses on the recent advances on the design principles,preparation methods,optical properties,and the wide applications of fluorescent metallacycles with the FRET property.展开更多
Under hydrothermal environment,we synthesized lanthanide ions doped sodium yttrium fluoride(NaYF4:Er,Tm@NaYF4:Ce,Tb) luminescent microcrystals via an epitaxial growth technique.The structure and morphology of these mi...Under hydrothermal environment,we synthesized lanthanide ions doped sodium yttrium fluoride(NaYF4:Er,Tm@NaYF4:Ce,Tb) luminescent microcrystals via an epitaxial growth technique.The structure and morphology of these microcrystals were examined by SEM,TEM,EDS and XRD measurements.These particles show dual-mode emissions with red upconversion(UC) and green down conversion(DC) as single particles level.The mean length and diameter of these microparticles increase from 0.43 to2.26 μm and from 1.33 to 1.86 μm,respectively.Most interestingly,the photoluminescence properties of NaYF4:Er,Tm@NaYF4:Ce,Tb phosphor crystals are highly dependent on the crystallite size.The microcrystals fluoresce emit dual-mode emissions when they are solid or dispersed in solvents.Benefiting its intensive fluorescence and uniform morphology,these materials hold great potential for security and anti-counterfeiting applications.展开更多
Metallacycles hold great promise for fluorescence-based sensing due to their synthetic advantages and unique physicochemical properties. However, it remains highly challenging to develop a versatile methodology for co...Metallacycles hold great promise for fluorescence-based sensing due to their synthetic advantages and unique physicochemical properties. However, it remains highly challenging to develop a versatile methodology for constructing highly emissive metallacycles with targeted functionalities and therefore soughtafter properties. Herein, we report a general strategy to construct a series of highly emissive perylene diimide-based metallacycles via the self-assembly of perylene diimide-based tetrapyridyl ligand with different dicarboxylic ligands featuring fixed angles and cis-Pt(PEt_(3))_(2)(OTf)_(2). Single crystal X-ray diffraction analyses verify the formation of bowtie-like metallacycles with two triangular cavities. Notably, the fluorescence quantum yields of most assemblies exceed 98%, amongst the highest values for metallacycles.Additionally, such metallacycles exhibit sensitive fluorescence responses toward picric acid with a detection limit of 2.8 × 10^(-6)mol/L. This study not only provides a rational strategy for preparing highly emissive bowtie-shaped metallacycles, but also sheds light on their usage in the detection of picric acid and associated compounds.展开更多
Optical imaging plays an important role in biomedical research being extremely useful for early detection, screening and image-guided therapy. Lanthanide-doped up-converting nanoparticles were ideally suited for bioim...Optical imaging plays an important role in biomedical research being extremely useful for early detection, screening and image-guided therapy. Lanthanide-doped up-converting nanoparticles were ideally suited for bioimaging because they could be ex- cited in near infrared （NIR） and emit in NIR or visible （VIS）. Here, we compared lanthanide doped up-converting NaYF4 and organic fluorophores for application in deep-tissue imaging. For that purpose - tissue phantoms mimicking the natural properties of light scat- tering by living tissues were prepared. The studies allowed to quantitatively compare optical resolution of different fluorescent com- pounds, revealing that the NIR photoexcitation was favorable over conventional UV photoexcitation.展开更多
Many researchers have studied the photocatalytic oxidation of trace levels of benzene,toluene and xy-lene in air over titania photocatalysts.However,atthe moment,the effectiveness of the photocatalytic oxidation is li...Many researchers have studied the photocatalytic oxidation of trace levels of benzene,toluene and xy-lene in air over titania photocatalysts.However,atthe moment,the effectiveness of the photocatalytic oxidation is limited by the deactivation of photocata-lysts.展开更多
Benzo-21-crown-7(B21 C7)is one of the most important crown ethers,which not only shows excellent physicochemical properties but also exhibits promising binding capability with dialkylammonium salts.In this paper,we de...Benzo-21-crown-7(B21 C7)is one of the most important crown ethers,which not only shows excellent physicochemical properties but also exhibits promising binding capability with dialkylammonium salts.In this paper,we designed and synthesized a fixed-tetraphenylethylene(FTPE)motif bridged ditopic benzo-21-crown-7 molecule(H).The fixed tetraphenylethylene motif endows H with aggregation induced emission(AIE)prope rty.In the presence of a ditopic dialkylammonium salt vip molecule(G),a fluorescent supramolecular polymer with golden luminescent property could be fabricated.This B21 C7-based host-vip supramolecular polymer with golden fluorescence may have potential application in dynamic luminescent materials.展开更多
Phospholes are emerging as distinctive conjugated scaffolds for organic fluorescent materials owing to their unique structural characteristics that are different from many commonly studied heterocyclic frameworks.Rece...Phospholes are emerging as distinctive conjugated scaffolds for organic fluorescent materials owing to their unique structural characteristics that are different from many commonly studied heterocyclic frameworks.Recently,phosphole-derived skeletons have garnered significant attention as a remarkable electron-accepting moiety,which has achieved substantial advance-ments in the application of fluorescent biomaterials because of their physicochemical traits,especially in the aspects of stability and versatility.In this context,this review summarizes the progress in phosphole-based fluorescent biomaterials over the past decade(2015-2024).It begins with an overview of the currently developed phosphole-based scaffolds specifically designed for biological applications,illustrating their unique structures and favorable properties.Representative examples are then showcased to demonstrate their potential in various biological scenarios with a primary focus on bioimaging and therapy.Last,challenges and prospects in this field are presented.This review could serve as a consolidated and valuable reference for the future exploration and innovation of bioimaging and therapy platforms.展开更多
Organic fluorescentmaterials(OFMs),characterized by their unique molecular structures and exceptional optical properties,have demonstrated significant potential in diverse applications such as bioimaging,sensors,and d...Organic fluorescentmaterials(OFMs),characterized by their unique molecular structures and exceptional optical properties,have demonstrated significant potential in diverse applications such as bioimaging,sensors,and display technologies.Nevertheless,the reliance on chemists’intuition and experience in the traditional design of OFMs,coupled with the high cost and lack of scalability of conventional methods such as fluorescence detection and Density Functional Theory(DFT)calculations,makes it difficult to keep up with the rapid development of the field.The advent ofmachine learning(ML)has introduced transformative possibilities,enabling data-driven exploration of the intricate relationships between molecular structures and fluorescence properties.Herein,we review the applications of ML in the innovative design of OFMs with an emphasis on the workflow of modeling,optical property prediction,and OFM design.We also discuss the critical role of data curation and feature engineering in enhancing model performance.Our review provides an overview of commonly used models and assesses their efficacy.We critically examine key challenges such as database construction,model interpretability,and generalization ability,trying to provide a comprehensive framework that advances the integration of ML in the research of organic fluorescentmaterials,thereby facilitating the development of next-generation materials.展开更多
A three-dimensional(3D)zinc metal-organic framework(MOF),Zn4(μ4-O)(bcd)3(complex 1)has been synthesized by using 1-[bis(4-carboxylphenyl)methyl]-1,3-diazole(H2 bcd)and Zn(NO3)2·6 H2O under hydrothermal condition...A three-dimensional(3D)zinc metal-organic framework(MOF),Zn4(μ4-O)(bcd)3(complex 1)has been synthesized by using 1-[bis(4-carboxylphenyl)methyl]-1,3-diazole(H2 bcd)and Zn(NO3)2·6 H2O under hydrothermal conditions.The structure has been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses,IR spectra,powder X-ray diffraction(PXRD)and thermogravimetric analyses(TGA).Single-crystal X-ray diffraction analyses reveal that complex 1 crystallizes in trigonal system,space group R3 with a=23.0521(6),b=23.0521(6),c=15.3326(6)A,γ=120°,V=7056.2(4)A^3,Z=6,C54H36N6O13Zn4,Mr=1242.37,Dc=1.754 g/cm^3,F(000)=3756,the final R=0.0411 and wR=0.1007 for 2743 observed reflections(I>2σ(I)).Complex 1 consists of a 3D network constructed by four nuclear clusters Zn4(μ4-O)(COO)6 N3 and the bcd2-ligand.Interestingly,1 exhibits strong luminescent emission in solid state at room temperature and could be used as a qualitative fluorescence enhancing sensor for ammonia vapor in air.展开更多
Near-infrared （NIR） fluorescent metal nanodots may have significant advantages in biological detection and bioimaging. Herein, we introduce tunable near-infrared fluorescent gold nanodots （AuNDs） protected by bran...Near-infrared （NIR） fluorescent metal nanodots may have significant advantages in biological detection and bioimaging. Herein, we introduce tunable near-infrared fluorescent gold nanodots （AuNDs） protected by branched polyethylenimine （PEI） modified by surface segmental attachment of sulfhydryl groups （PEI-SH）, abbreviated as PEI-SH-AuNDs, for simultaneous gene delivery and cell imaging. The modified PEI endows the resultant PEI-SH-AuNDs with the following excellent advantages. Sulfhydryl groups of PEI-SH anchor to the surface of AuNDs, and such polycations with amine groups give PEI-SH-AuNDs remarkable stability. The cationic polymer PEI-SH with positive charges enables PEI-SH-AuNDs to perform gene delivery, and the gene transfection efficiency can reach 22.8%. Moreover, the fluorescence of PEI-SH-AuNDs is tunable from visible red light （wavelength 609 nm） to NIR light （wavelength 811 run） via an increase in the size of AuNDs. PEI-SH-AuNDs yielded gene transfection efficiency similar to that of commercial PEI, but showed much lower cytotoxicity and much greater red-shift fluorescence. With excellent photoluminescent properties, such multifunctional fluorescent PEI-SH-AuNDs hold promise in applications to bioimaging and as ideal fluorescent probes for tracking gene transfection behavior.展开更多
A π-conjugated optical functional organic compound comprising an electron donor(D) and acceptor(A) was synthesized. The crystal structure was determined through single-crystal X-ray diffraction analysis. It crystalli...A π-conjugated optical functional organic compound comprising an electron donor(D) and acceptor(A) was synthesized. The crystal structure was determined through single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P2_(1) with a = 9.6610(5), b = 8.9093(4), c = 26.303(1)Å, β = 96.262(4)°, V = 2250.5(2)Å^(3), Z = 4, D_(c)= 1.220 Mg/m^(3), F(000) = 872, Μr = 413.50, μ = 0.072 mm^(-1), the final R = 0.0569 and wR = 0.1700 for 8976 observed reflections with I > 2σ(I). Optical properties were studied in detail through theoretical calculation and experimental study. The result reveals that the compound exhibits excellent fluorescence performance and it can be compatible in the cytoplasm of NIH/3T3 cells, showing potential in fluorescence microscopy bioimaging.展开更多
Comprehensive Summary Fluorescent silk has potential application in many fields such as bioimaging,tissue engineering scaffolds,luminescent marks,and dazzling fabrics.Among the methods to endow natural silk with fluor...Comprehensive Summary Fluorescent silk has potential application in many fields such as bioimaging,tissue engineering scaffolds,luminescent marks,and dazzling fabrics.Among the methods to endow natural silk with fluorescent properties,feeding silkworms with fluorescent additives is facile,low-cost and environment friendly,which has the prospect of large-scale production.In this paper,we reviewed the research progress for this aim in the past ten years,and summarized the unified characteristics for the substances that can enter the silk gland by digestive tract of silkworms.The advantages and disadvantages of various fluorescent materials for this application are compared in detail.And the future research directions are suggested to overcome the shortcomings of the present research.展开更多
A pure-blue light-emitting material is one of the key components in the preparation of organic lightemitting diode(OLED)displays.Although highefficiency blue OLEDs have been realized in thermally activated delayed flu...A pure-blue light-emitting material is one of the key components in the preparation of organic lightemitting diode(OLED)displays.Although highefficiency blue OLEDs have been realized in thermally activated delayed fluorescence(TADF)materials,they need to be dispersed into suitable hostmaterials.Hence,exploring efficient nondoped,pure-blue luminous molecules is important.展开更多
Carbazole-triazine dendrimers with a bulky terminal substituent were synthesized,and the thermally activated delayed fluorescence(TADF)property was investigated.Compared to unsubstituted carbazole dendrimers,dendrimer...Carbazole-triazine dendrimers with a bulky terminal substituent were synthesized,and the thermally activated delayed fluorescence(TADF)property was investigated.Compared to unsubstituted carbazole dendrimers,dendrimers with bulky terminal substituents showed comparable to better photoluminescence quantum yields(PLQY)in neat films.Phenylfluorene(PF)-substituted dendrimers showed the highest PLQY of 81%,a smallΔEst of 0.06 eV,and the fastest reverse intersystem crossing(RISC)rate of∼1×10^(5 )s^(−1) compared to other dendrimers.Phosphorescence measurements of dendrimers and dendrons(fragments)indicate that the close proximity of the triplet energy of phenylfluorene-substituted carbazole dendrons(^(3)LE)to that of phenylfluorene-substituted dendrimers(^(1)CT,^(3)CT)contributes to RISC promotion and improves TADF efficiency.Terminal modification fine-tunes the energy level and suppresses intermolecular interactions,and this study provides a guideline for designing efficient solution-processable and non-doped TADF materials.展开更多
基金supported by the Zhejiang Sci-Tech University Shengzhou Innovation Research Institute(SYY2.023C000005)the National Natural Science Foundation of China(51803184)。
文摘Dynamic fluorescent materials capable of stimulus-responsive emission modulation have emerged as pivotal components in next-generation information security systems.This study presents a novel photoresponsive fluorescent composite system in which spiropyran(SP)was covalently grafted onto naphthalimide-functionalized silica aerogel matrices.These architectures exhibit reversible fluorescence resonance energy transfer between the naphthalimide donors and merocyanine-form of SP acceptors under ultraviolet irradiation,enabling dynamic emission shifting from green(blue)to red.The aggregation-induced emission characteristics of SP were used to engineer a smart material system that can reversibly regulate its distinct red fluorescence by precisely controlling the dispersion of amino groups on naphthalimide-functionalized silica aerogels.This spatial manipulation directly governs the molecular packing state of SP,enabling dynamic fluorescence modulation.A programmable control over the fluorescence chromatic transitions in the composite material was achieved by systematically adjusting the SP grafting densities(1%,2%,and 3%w/w).A unique mode of dynamic information encryption technology was developed by utilizing dynamic fluorescence variations.These materials can substantially enhance information encryption levels due to their precisely adjustable fluorescence properties in response to external stimuli over time.This makes the encryption process even more unpredictable and complex,thereby exponentially increasing the difficulty for unauthorized parties to replicate or decode the encrypted information.
基金supported by the National Natural Science Foundation of China(Nos.21375123,21675151,and 21721003)the Ministry of Science and Technology of China(No.2016YFA0203203).
文摘It is attractive and encouraging to develop new fluorescent carbon dots(CDs)with excellent optical properties and promising applications prospects.Herein,highly-efficient green emissive CDs(m-CDs)with a high quantum yield(QY)of 71.7%in water are prepared through a facile solvothermal method.Interestingly,the m-CDs exhibit excellent fluorescence stability in the pH range of 1–9.However,the fluorescence intensity of the m-CDs is almost completely quenched as the pH is increased from 9 to 10.The mechanism of the unique pH-responsive behavior is discussed in detail and a plausible mechanism is proposed.Owing to the unique pH-responsive behavior,the m-CDs are used as a on-off fluorescent probe for water quality identification.By combining the reversible pH-ultrasensitive optical properties of the m-CDs in the pH range of 9–10 with the glucose oxidase-mimicking(GOx-mimicking)ability of Au nanoparticles(AuNPs),glucose can be quantitatively detected.Finally,two environment-friendly starch-based solid-state fluorescence materials(powder and film)are developed through green preparation routes.
基金supported by the National Natural Science Foundation of China (Grant Nos. 50775198, 60102002, 60974115 and 60977061)the Youth Foundation of Education Bureau of Hebei Province (Grant No.2011225)
文摘Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source. The experiment of the emission and excitation optical spectrum, decay curve of fluorescence and residuals for several sensitive materials confirms the match of Y2O2S:Eu using the light source and the feasibility of the system. The rare earth material Y2O2S:Eu is selected as the material candidate for being the most sensitive.
基金supported by the National Natural Science Foundation of China(92256304,U23A20593)the Fundamental Research Funds for the Central Universities(020514380294)。
文摘Chirality is an important natural characteristic of organic molecules,and chiral organic molecules have shown extensive application in areas such as pharmaceutical development and material science.Benefiting from the ability to achieve circularly polarized luminescence(CPL),chiral luminescent materials have shown potential applications in anti-glare display,optical communication and,3D display,etc.Due to the ability to harvest both singlet and triplet excitons by a fast reverse intersystem crossing process without involving noble metals,chiral thermally activated delayed fluorescence(TADF)materials with point chirality,axial chirality,planar chirality and helical chirality are regarded as the state-of-the-art materials for circularly polarized organic light-emitting diodes(CP-OLEDs).In recent years,the chiral TADF materials and CP-OLEDs have rapidly developed,but unfortunately,the dissymmetry factors(g)are far from the requirement of practical applications.The ideal emitters and devices should have both high efficiency and a g factor,or at least a balance between these two elements.This review gives an overview of recent progress in chiral TADF materials,with a particular focus on the chiral skeleton,CPL property and device performance.Furthermore,the molecular design concept,device structure and methods to improve the g factors of chiral materials and CP-OLEDs are also discussed.
基金the National Natural Science Foundation of China(Nos.21274016 and 21072026)Fundamental Research Funds for the Central Universities(No.DUT13LK06)for financial support to this work
文摘Two novel thieno-[3,4-b]-pyrazine-based molecules, TP-E and TP-O, were designed and synthesized for potential application as red fluorescent emitters. The bulky tetraphenylethylene groups were attached at the periphery of the thieno-[3,4-b]-pyrazine core to form the non-planar molecules, as efficient solid- state emitting materials. The peripheral groups were grafted to the emissive core through either a conjugated acetylene bond, or a non-conjugated ether bond. These molecules exhibit strnng red fluorescence in both dilute solutions and in thin films with large Stokes shifts of over 100 nm. The cyclic voltammetry measurements showed the reversible oxidation and reduction behavior for both compounds. All these properties indicate the two compounds are possible functional materials for use in ontoelectronic devices.
基金National Natural Science Foundation of China 20671020
文摘Fluorescence material of Sm doped Si-Ca-Mg system was synthesized by using the method of solid phase reaction at high temperature. The phase composition and crystal structure of this material were analyzed with XRD method for its composition and the existence form of Sm atom. We aimed to exactly determine the phase composition of this fluorescence material and the doping position and environment of rare-earth Sm atom in the system because these factors have significant effects on the properties. The analytical results show that the Sm atoms dope in Ca2O26Si6Sm8 lattice in the form of atomic site-occupation in three different space positions with different occupancy rates. Therefore, based on the XRD analytical results, the fluorescence material of Sm doped Si-Ca-Mg system with high performance can be synthesized.
基金the National Nature Science Foundation of China(Nos.21922506,21871092,21672070 and31702070)Shanghai Pujiang Program(No.18PJD015)+1 种基金the Fundamental Research Funds for the Central Universities,Shanghai Municipal Natural Science Foundation(No.19ZR1437900)the Opening Projects of Shanghai Key Laboratory of Green Chemistry and Chemical Processes,and State Key Laboratory of Fine Chemicals(No.KF 1801)。
文摘During past few years,the construction of fluorescent metallacycles featuring the fluorescenceresonance energy transfer behavior has attracted extensive attention due to their diverse applications such as real-time monitoring the dynamics of coordination-driven self-assembly,photoswitching fluorescence-resonance energy transfer,and light-controlled generation of singlet oxygen for cancer therapy.This review focuses on the recent advances on the design principles,preparation methods,optical properties,and the wide applications of fluorescent metallacycles with the FRET property.
基金Project supported by the National Natural Science Foundation of China (21271074,51372091)the Teamwork Projects funded by the Guangdong Natural Science Foundation (S2013030012842)+1 种基金Guangdong Provincial Science&Technology Project (2015B090903074)Guangzhou Science&Technology Project (201605030005)。
文摘Under hydrothermal environment,we synthesized lanthanide ions doped sodium yttrium fluoride(NaYF4:Er,Tm@NaYF4:Ce,Tb) luminescent microcrystals via an epitaxial growth technique.The structure and morphology of these microcrystals were examined by SEM,TEM,EDS and XRD measurements.These particles show dual-mode emissions with red upconversion(UC) and green down conversion(DC) as single particles level.The mean length and diameter of these microparticles increase from 0.43 to2.26 μm and from 1.33 to 1.86 μm,respectively.Most interestingly,the photoluminescence properties of NaYF4:Er,Tm@NaYF4:Ce,Tb phosphor crystals are highly dependent on the crystallite size.The microcrystals fluoresce emit dual-mode emissions when they are solid or dispersed in solvents.Benefiting its intensive fluorescence and uniform morphology,these materials hold great potential for security and anti-counterfeiting applications.
基金supported by the National Natural Science Foundation of China (No. 22171219)the Fundamental Research Funds for the Central Universities (No. xzy022021004)。
文摘Metallacycles hold great promise for fluorescence-based sensing due to their synthetic advantages and unique physicochemical properties. However, it remains highly challenging to develop a versatile methodology for constructing highly emissive metallacycles with targeted functionalities and therefore soughtafter properties. Herein, we report a general strategy to construct a series of highly emissive perylene diimide-based metallacycles via the self-assembly of perylene diimide-based tetrapyridyl ligand with different dicarboxylic ligands featuring fixed angles and cis-Pt(PEt_(3))_(2)(OTf)_(2). Single crystal X-ray diffraction analyses verify the formation of bowtie-like metallacycles with two triangular cavities. Notably, the fluorescence quantum yields of most assemblies exceed 98%, amongst the highest values for metallacycles.Additionally, such metallacycles exhibit sensitive fluorescence responses toward picric acid with a detection limit of 2.8 × 10^(-6)mol/L. This study not only provides a rational strategy for preparing highly emissive bowtie-shaped metallacycles, but also sheds light on their usage in the detection of picric acid and associated compounds.
基金Project supported by Wroclaw Research Centre EIT+within the project"The Application of Nanotechnology in Advanced Materials"-NanoMat(POIG.01.01.02-02-002/08)financed by the European Regional Development Fund(Operational Programme Innovative Economy,1.1.2)
文摘Optical imaging plays an important role in biomedical research being extremely useful for early detection, screening and image-guided therapy. Lanthanide-doped up-converting nanoparticles were ideally suited for bioimaging because they could be ex- cited in near infrared （NIR） and emit in NIR or visible （VIS）. Here, we compared lanthanide doped up-converting NaYF4 and organic fluorophores for application in deep-tissue imaging. For that purpose - tissue phantoms mimicking the natural properties of light scat- tering by living tissues were prepared. The studies allowed to quantitatively compare optical resolution of different fluorescent com- pounds, revealing that the NIR photoexcitation was favorable over conventional UV photoexcitation.
文摘Many researchers have studied the photocatalytic oxidation of trace levels of benzene,toluene and xy-lene in air over titania photocatalysts.However,atthe moment,the effectiveness of the photocatalytic oxidation is limited by the deactivation of photocata-lysts.
基金the financial support from the National Natural Science Foundation of China(No.21702020)。
文摘Benzo-21-crown-7(B21 C7)is one of the most important crown ethers,which not only shows excellent physicochemical properties but also exhibits promising binding capability with dialkylammonium salts.In this paper,we designed and synthesized a fixed-tetraphenylethylene(FTPE)motif bridged ditopic benzo-21-crown-7 molecule(H).The fixed tetraphenylethylene motif endows H with aggregation induced emission(AIE)prope rty.In the presence of a ditopic dialkylammonium salt vip molecule(G),a fluorescent supramolecular polymer with golden luminescent property could be fabricated.This B21 C7-based host-vip supramolecular polymer with golden fluorescence may have potential application in dynamic luminescent materials.
基金supported by the National Natural Science Foundation of China(2375066 and U23A20594)the Guangdong Basic and Applied Basic Research Foundation(2023B1515040003).
文摘Phospholes are emerging as distinctive conjugated scaffolds for organic fluorescent materials owing to their unique structural characteristics that are different from many commonly studied heterocyclic frameworks.Recently,phosphole-derived skeletons have garnered significant attention as a remarkable electron-accepting moiety,which has achieved substantial advance-ments in the application of fluorescent biomaterials because of their physicochemical traits,especially in the aspects of stability and versatility.In this context,this review summarizes the progress in phosphole-based fluorescent biomaterials over the past decade(2015-2024).It begins with an overview of the currently developed phosphole-based scaffolds specifically designed for biological applications,illustrating their unique structures and favorable properties.Representative examples are then showcased to demonstrate their potential in various biological scenarios with a primary focus on bioimaging and therapy.Last,challenges and prospects in this field are presented.This review could serve as a consolidated and valuable reference for the future exploration and innovation of bioimaging and therapy platforms.
基金funded by the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(LQ23B020010)the Science Foundation of Zhejiang Sci-Tech University(22202010-Y).
文摘Organic fluorescentmaterials(OFMs),characterized by their unique molecular structures and exceptional optical properties,have demonstrated significant potential in diverse applications such as bioimaging,sensors,and display technologies.Nevertheless,the reliance on chemists’intuition and experience in the traditional design of OFMs,coupled with the high cost and lack of scalability of conventional methods such as fluorescence detection and Density Functional Theory(DFT)calculations,makes it difficult to keep up with the rapid development of the field.The advent ofmachine learning(ML)has introduced transformative possibilities,enabling data-driven exploration of the intricate relationships between molecular structures and fluorescence properties.Herein,we review the applications of ML in the innovative design of OFMs with an emphasis on the workflow of modeling,optical property prediction,and OFM design.We also discuss the critical role of data curation and feature engineering in enhancing model performance.Our review provides an overview of commonly used models and assesses their efficacy.We critically examine key challenges such as database construction,model interpretability,and generalization ability,trying to provide a comprehensive framework that advances the integration of ML in the research of organic fluorescentmaterials,thereby facilitating the development of next-generation materials.
基金Natural Science Foundation and Innovative Talents Promotion Plan of Shaanxi Province(2019KJXX-075,2018JQ2079,2018JQ2040)。
文摘A three-dimensional(3D)zinc metal-organic framework(MOF),Zn4(μ4-O)(bcd)3(complex 1)has been synthesized by using 1-[bis(4-carboxylphenyl)methyl]-1,3-diazole(H2 bcd)and Zn(NO3)2·6 H2O under hydrothermal conditions.The structure has been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses,IR spectra,powder X-ray diffraction(PXRD)and thermogravimetric analyses(TGA).Single-crystal X-ray diffraction analyses reveal that complex 1 crystallizes in trigonal system,space group R3 with a=23.0521(6),b=23.0521(6),c=15.3326(6)A,γ=120°,V=7056.2(4)A^3,Z=6,C54H36N6O13Zn4,Mr=1242.37,Dc=1.754 g/cm^3,F(000)=3756,the final R=0.0411 and wR=0.1007 for 2743 observed reflections(I>2σ(I)).Complex 1 consists of a 3D network constructed by four nuclear clusters Zn4(μ4-O)(COO)6 N3 and the bcd2-ligand.Interestingly,1 exhibits strong luminescent emission in solid state at room temperature and could be used as a qualitative fluorescence enhancing sensor for ammonia vapor in air.
基金This work was supported by the National Natural Science Foundation of China （Nos. 51503085, 51373061 and 21304090）, Science Foundation of China University of Petroleum, Beijing （No. 2462017YJRC027）, open project of state key laboratory of supramolecular structure and materials （No. sklssm201724） and Graduate Innovation Fund of Jilin University （Project 2016112）.
文摘Near-infrared （NIR） fluorescent metal nanodots may have significant advantages in biological detection and bioimaging. Herein, we introduce tunable near-infrared fluorescent gold nanodots （AuNDs） protected by branched polyethylenimine （PEI） modified by surface segmental attachment of sulfhydryl groups （PEI-SH）, abbreviated as PEI-SH-AuNDs, for simultaneous gene delivery and cell imaging. The modified PEI endows the resultant PEI-SH-AuNDs with the following excellent advantages. Sulfhydryl groups of PEI-SH anchor to the surface of AuNDs, and such polycations with amine groups give PEI-SH-AuNDs remarkable stability. The cationic polymer PEI-SH with positive charges enables PEI-SH-AuNDs to perform gene delivery, and the gene transfection efficiency can reach 22.8%. Moreover, the fluorescence of PEI-SH-AuNDs is tunable from visible red light （wavelength 609 nm） to NIR light （wavelength 811 run） via an increase in the size of AuNDs. PEI-SH-AuNDs yielded gene transfection efficiency similar to that of commercial PEI, but showed much lower cytotoxicity and much greater red-shift fluorescence. With excellent photoluminescent properties, such multifunctional fluorescent PEI-SH-AuNDs hold promise in applications to bioimaging and as ideal fluorescent probes for tracking gene transfection behavior.
基金supported by the Major Project of Natural Science Research in Universities of Anhui Province(KJ2020A0533,KJ2020A0525)Natural Science Foundation of Anhui Province(1508085MB21)+2 种基金National Students Research Training Program(201910371016,201910371004,S202010371055)Research Innovation Team of Fuyang Normal University(kytd201710)Key Laboratory of Degradation and Detection of Environmental Pollutants of Anhui Province。
文摘A π-conjugated optical functional organic compound comprising an electron donor(D) and acceptor(A) was synthesized. The crystal structure was determined through single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P2_(1) with a = 9.6610(5), b = 8.9093(4), c = 26.303(1)Å, β = 96.262(4)°, V = 2250.5(2)Å^(3), Z = 4, D_(c)= 1.220 Mg/m^(3), F(000) = 872, Μr = 413.50, μ = 0.072 mm^(-1), the final R = 0.0569 and wR = 0.1700 for 8976 observed reflections with I > 2σ(I). Optical properties were studied in detail through theoretical calculation and experimental study. The result reveals that the compound exhibits excellent fluorescence performance and it can be compatible in the cytoplasm of NIH/3T3 cells, showing potential in fluorescence microscopy bioimaging.
基金by the National Natural Science Foundation of China(21975048,21771039)the Shanghai Science and Technology Committee(19Dz2270100).
文摘Comprehensive Summary Fluorescent silk has potential application in many fields such as bioimaging,tissue engineering scaffolds,luminescent marks,and dazzling fabrics.Among the methods to endow natural silk with fluorescent properties,feeding silkworms with fluorescent additives is facile,low-cost and environment friendly,which has the prospect of large-scale production.In this paper,we reviewed the research progress for this aim in the past ten years,and summarized the unified characteristics for the substances that can enter the silk gland by digestive tract of silkworms.The advantages and disadvantages of various fluorescent materials for this application are compared in detail.And the future research directions are suggested to overcome the shortcomings of the present research.
基金National Natural Science Foundation of China(nos.51873095 and 51673105)the Natural Science Foundation of Qingdao City of China(no.16-5-1-89-jch)+1 种基金the Open Project of the State Key Laboratory of Supramolecular Structure and Materials of Jilin University(no.SKLSSM-202032)the Key Project of Higher Educational Science and Technology Program of Shandong Province of China(no.J18KZ001)for their support.
文摘A pure-blue light-emitting material is one of the key components in the preparation of organic lightemitting diode(OLED)displays.Although highefficiency blue OLEDs have been realized in thermally activated delayed fluorescence(TADF)materials,they need to be dispersed into suitable hostmaterials.Hence,exploring efficient nondoped,pure-blue luminous molecules is important.
基金Ministry of Education,Culture,Sports,Science and Technology,Grant/Award Number:ARIM/JPMXP1222JI0040Japan Society for the Promotion of Science,Grant/Award Numbers:KAKENHI/JP20KK0316,KAKENHI/JP21H05405,KAKENHI/JP22H02055,KAKENHI/JP23H02026,KAKENHI/JP23H03966,KAKENHI/JP20H02801。
文摘Carbazole-triazine dendrimers with a bulky terminal substituent were synthesized,and the thermally activated delayed fluorescence(TADF)property was investigated.Compared to unsubstituted carbazole dendrimers,dendrimers with bulky terminal substituents showed comparable to better photoluminescence quantum yields(PLQY)in neat films.Phenylfluorene(PF)-substituted dendrimers showed the highest PLQY of 81%,a smallΔEst of 0.06 eV,and the fastest reverse intersystem crossing(RISC)rate of∼1×10^(5 )s^(−1) compared to other dendrimers.Phosphorescence measurements of dendrimers and dendrons(fragments)indicate that the close proximity of the triplet energy of phenylfluorene-substituted carbazole dendrons(^(3)LE)to that of phenylfluorene-substituted dendrimers(^(1)CT,^(3)CT)contributes to RISC promotion and improves TADF efficiency.Terminal modification fine-tunes the energy level and suppresses intermolecular interactions,and this study provides a guideline for designing efficient solution-processable and non-doped TADF materials.
