Developing efficient,non-toxic,and low-cost emitters is a key issue in promoting the applications of electrochemiluminescence(ECL).Among varied ECL emitters,polymeric emitters are attracting dramatically increasing in...Developing efficient,non-toxic,and low-cost emitters is a key issue in promoting the applications of electrochemiluminescence(ECL).Among varied ECL emitters,polymeric emitters are attracting dramatically increasing interest due to tunable structure,large surface area,brilliant transfer capability,and sustainable raw materials.In this review,we present a general overview of recent advances in developing polymeric luminophores,including their structural and synthetic methodologies.Methods rooted in straightforward unique structural modulation have been comprehensively summarized,aiming at enhancing the efficiency of ECL along with the underlying kinetic mechanisms.Moreover,as several conjugated polymers were just discovered in recent years,promising prospects and perspectives have also been deliberated.The insight of this review may provide a new avenue for helping develop advanced conjugated polymer ECL emitters and decode ECL applications.展开更多
Formation of dopant ions clusters in solid （glass） luminophores may affect efficiency of non-radiative energy transfer proc- esses between dopant （photoactivator） ions via shortening of the effective distance betw...Formation of dopant ions clusters in solid （glass） luminophores may affect efficiency of non-radiative energy transfer proc- esses between dopant （photoactivator） ions via shortening of the effective distance between them. This study was based on the as- sumption that the distance between the dopant ions affects the energy of crystal volume at proximity. According to this idea, semi-empirical and ab initio density functional theory （DFT） calculations were performed on various supercells of YVO4：Eu3＋ as a model system. It was noted that a shorter Eu-Eu distance resulted in lower total energy of the system, compared to an analogous structure with distant Eu3＋ ions. As lower energy configurations are preferred, the observed phenomenon was considered to be related to dopant ions clusters formation. Additionally, the values of energies obtained from DFT calculations were used to estimate the per- centage of dopant ions occurring as pairs, for different dopant concentrations. The estimation agreed quite well with the available lit- erature data.展开更多
Electrochemiluminescence has been developed as a robust analytical technique owing to its intrinsic advantages,such as near-zero background signal noise,wide dynamic ranges,high sensitivity and low cost and simple equ...Electrochemiluminescence has been developed as a robust analytical technique owing to its intrinsic advantages,such as near-zero background signal noise,wide dynamic ranges,high sensitivity and low cost and simple equipment.ECL luminophore as the critical component to generate light signals plays significant roles in this robust analytical system.Compared with traditional ECL luminophores,near infrared(NIR)ECL luminophores have attracted significant attentions recently due to their negligible autofluorescence,lower background interference and deep tissue penetration.Although substantial progresses have been achieved in exploring novel NIR ECL luminophores and elucidating their roles in addressing diverse challenges,there is still scarce of comprehensive reviews on the development of NIR ECL luminophores so far.In this review,the recent advancements on NIR ECL materials,including inorganic metal complexes,organic small molecules,metal nanoclusters,quantum dots and lanthanide-based materials,have been thoroughly summarized and discussed.In addition,we also provide a comprehensive overview of the challenges and prospects that lie ahead for the future development of NIR ECL luminophores in the future.展开更多
Solar-driven interfacial evaporation is a promising technology for desalination.The photothermal conversion materials are at the core and play a key role in thisfield.Design of photothermal conversion materials based ...Solar-driven interfacial evaporation is a promising technology for desalination.The photothermal conversion materials are at the core and play a key role in thisfield.Design of photothermal conversion materials based on organic dyes for desalina-tion is still a challenge due to lack of efficient guiding strategy.Herein,a new D(donor)-A(acceptor)type conjugated tetraphenylpyrazine(TPP)luminophore(namely TPP-2IND)was prepared as a photothermal conversion molecule.It exhib-ited a broad absorption spectrum and strongπ–πstacking in the solid state,resulting in efficient sunlight harvesting and boosting nonradiative decay.TPP-2IND powder exhibited high photothermal efficiency upon 660 nm laser irradiation(0.9 W cm^(-2)),and the surface temperature can reach to 200℃.Then,an interfacial heating system based on TPP-2IND is established successfully.The water evaporation rate and the solar-driven water evaporation efficiency were evaluated up to 1.04 kg m^(-2) h^(-1) and 65.8%under 1 sunlight,respectively.Thus,this novel solar-driven heating system shows high potential for desalination and stimulates the development of advanced photothermal conversion materials.展开更多
Nonconventional luminophores have attracted significant attention for their unique photophysical properties and potential applications in different areas.Unlike classic luminogens consisting of remarkably conjugated s...Nonconventional luminophores have attracted significant attention for their unique photophysical properties and potential applications in different areas.Unlike classic luminogens consisting of remarkably conjugated segments,nonconventional luminophores generally possess merely nonconjugated or short-conjugated structures based on electron-rich units.Fluorescence,phosphorescence,and even color tunable room temperature phosphorescence(RTP)could be readily obtained from these unique luminophores.Herein,we summarized recent advances in the phosphorescence of nonconventional luminophores,with focus on RTP and color tunable RTP.The clustering-triggered emission(CTE)mechanism could be applied to explain the luminescence as clustering-triggered phosphorescence(CTP).Furthermore,strategies toward the RTP regulation are summarized,and corresponding applications are demonstrated.展开更多
Point-chiral groups as pendants conjugated to the aromatic luminophore generate weak chiroptical signals without self-assembly,showing the dependence on the flexibility of tethers,which hinders the development of poin...Point-chiral groups as pendants conjugated to the aromatic luminophore generate weak chiroptical signals without self-assembly,showing the dependence on the flexibility of tethers,which hinders the development of point-chiral molecular materials with chiroptical properties such as the circularly polarized luminescence(CPL).Herein we introduce the molecular chiroptical materials based on the point chirality on a single benzene luminophore scaffold.Substitutes were stepwise conjugated to single benzene luminophores to boost the steric hindrance and tension,whereby the chirality transfer efficiency from point-chiral substituents to luminophores was enhanced.Multiple intramolecular CH-πinteractions anchor the whole asymmetric geometry with ultra-high rotation energy barriers and excellent thermostability.Dissymmetry g-factors of circular dichroism and CPL spectra up to 10^(-3)order of magnitude were realized in solutions,which are comparable to the inherent-chiral luminophores such as helicene and binaphthyl derivatives.The acridine-appended single benzene system shows the emergence of thermally activated delayed fluorescence(TADF),which extends the potentials of the single benzene chiral system in the TADF-based chiroptical devices.展开更多
Developing dual-state luminophores(DSLs)with strong fluorescence in both the monomer and aggregate states is urgently needed but remains a huge challenge because most current luminophores are either aggregation-induce...Developing dual-state luminophores(DSLs)with strong fluorescence in both the monomer and aggregate states is urgently needed but remains a huge challenge because most current luminophores are either aggregation-induced emission or aggregation-caused quenching molecules.Moreover,limited by the structural conservation of the few existing DSLs,there are not enough response sites that can be used to customize various activatable fluorescent probes for specific molecular imaging.Herein,we engineered a general integration strategy for the fabrication of such DSLs with excellent photophysical properties.The DSLs,with their tunable spectra,a large Stokes shift(>170 nm),and achievable near-infrared(NIR)emission,show great potential for high-contrast imaging.Importantly,DSLs can be used as a universal platform for probe customization due to their activatable fluorescence through protection-deprotection of the phenolic hydroxyl group.Based on this,an NIR fluorescent probe DSL-Gal was developed for sensing of β-galactosidase in solutions,senescent cells,and liver metastases with high contrast,further confirming the superiority and universal feasibility of DSLs in probe design.The integration strategy may provide a novel approach for the generation of other DSLs and have great potential applications in bioimaging.展开更多
Perovskite(PRV)luminescent solar concentrators(LSCs)use PRV materials to concentrate and convert sunlight into electricity.LSCs are made up of a flat plate or sheet of glass or plastic that contains a layer of lumines...Perovskite(PRV)luminescent solar concentrators(LSCs)use PRV materials to concentrate and convert sunlight into electricity.LSCs are made up of a flat plate or sheet of glass or plastic that contains a layer of luminescent PRV material.When sunlight enters the LSC,the PRV material absorbs the light and emits it at a longer wavelength.This emitted light is then trapped inside the LSC by total internal reflection,and it travels to the edges of the plate where it is collected by photovoltaic(PV)solar cells(SCs).The use of PRV materials in LSCs offers several advantages over other materials.PRV materials are highly efficient at converting light into electricity.They are also flexible,low-cost,and easy to manufacture,making them a promising candidate for large-scale solar energy applications.However,PRV materials have some challenges preventing their adoption.They are sensitive to moisture or heat and can degrade quickly over time.This significantly limits their lifespan and stability.Research on PRV is mostly focused on making them more stable and durable,but finding ways to improve the manufacturing process to reduce costs and increase efficiency is also relevant.While the opportunities offered by PRV materials for the specific application to LCSs are certainly interesting,the challenges make the prospect of a commercial product very unlikely in the short term.展开更多
The construction of molecular chirality is crucial for exploring novel luminophores with chiroptical properties.Classic asymmetric synthesis of chiral center or axial is not powerful enough on through-space architectu...The construction of molecular chirality is crucial for exploring novel luminophores with chiroptical properties.Classic asymmetric synthesis of chiral center or axial is not powerful enough on through-space architecture.Accessible methodologies for breaking molecular symmetry could be promising but remain less investigated.Herein,we report a novel methodology for constructing chiral through-space luminophores via simple chlorination on bridged carbazole motifs.The chlorination breaks the molecular symmetry and thus results in molecular chirality by eliminating the mirror plane or rotating axis.Interestingly,continuous multiple chlorinations can rebuild and break the symmetry of the skeleton in succession.Several chiral and achiral isomeric analogues are synthesized and characterized with impressive chiroptical properties.Results of chiral high performance liquid chromatography(HPLC),single-crystal X-ray diffraction,kinetic racemization,and chiroptical property investigation demonstrate the effectiveness of our rational design strategy.It provides a feasible methodology for exploring novel chiral luminescent materials based on versatile though-space skeletons.展开更多
The thermal stability of sprayable fast-responding Pressure-Sensitive Paint(fast PSP)was investigated to explore the possibility for application in turbomachinery and hypersonic research with temperature above 100℃.T...The thermal stability of sprayable fast-responding Pressure-Sensitive Paint(fast PSP)was investigated to explore the possibility for application in turbomachinery and hypersonic research with temperature above 100℃.The first part of the study focused on a widely-used Polymer Ceramic PSP(PC-PSP).The effects of thermal degradation on its key sensing properties,including luminescent intensity,pressure sensitivity and response time,were examined for a temperature range from 60 to 100℃.Severe degradation in intensity and pressure sensitivity was found as temperature reached 70℃or higher,which would cause failure of PSP application in these conditions.Subsequently,a fast-responding Mesoporous-Particle PSP(MP-PSP)was developed which did not show degradation effects until 140℃.The greatly improved thermal stability of MP-PSP was attributed to:selection of polymer with higher glass transition temperature(polystyrene)to delay the saturation effect of oxygen quenching as temperature increased;porous and hollow structure of particles for luminophore deposition that minimizes polymer–luminophore interaction.This new paint formulation has significantly raised the upper temperature limit of fast PSP and offers more opportunities for applications in harsh environment.展开更多
Point-of-care testing(POCT)technology is highly desirable for clinical diagnosis,healthcare monitoring,food safety inspection,and environment surveillance,because it enables rapid detection anywhere,anytime,and by any...Point-of-care testing(POCT)technology is highly desirable for clinical diagnosis,healthcare monitoring,food safety inspection,and environment surveillance,because it enables rapid detection anywhere,anytime,and by anyone.Electrochemiluminescence(ECL)has been widely used in chemo-/bio analysis due to its advantages such as high sensitivity,simplicity,rapidity and easy to control,and is now attracting increasing attention for POCT applications.However,to realize the accurate on-site quantitation,it is still challenging to develop portable devices which can precisely collect,analyze,transmit and display the ECL signals.This review will focus on how to develop a portable ECL device by summarizing recent examples and analyzing their key components part by part.Then the possible solutions to the existing challenges in the development and applications of portable ECL devices are summarized and discussed in detail,followed by offering future perspectives.We attempted to provide an appealing viewpoint to inspire interested researchers to comprehend and explore portable ECL sensing systems for practical applications and even commercialization.展开更多
Mixed strontium-yttrium borate phosphor Sr3Y2（BO3）4 doped with Eu^3＋ ions was obtained by the sol-gel Pechini method. Crystal structure of the synthesized compound was analyzed by X-ray powder diffraction. Optimal ...Mixed strontium-yttrium borate phosphor Sr3Y2（BO3）4 doped with Eu^3＋ ions was obtained by the sol-gel Pechini method. Crystal structure of the synthesized compound was analyzed by X-ray powder diffraction. Optimal conditions for the synthesis were found. Photophysical properties of the phosphor samples were investigated by collecting excitation and luminescence spectra as well as measuring lumi- nescence lifetime. Judd-Ofelt analysis showed that Eu^3＋ ions occupied Y^3＋ sites in the crystalline network. The studied compound showed a red emission with the quantum yield of 54%-55% and can be potentially used as phosphor for plasma display panels and luminescent tubes.展开更多
The luminophors of four kinds of alkaline earth meta-silicates doped with Eu^3 and/or Bi^(3+)ion(s)were synthesized and the luminescence properties of Bi^(3+)and Eu^(3+)ions were studied.The regularities that Me(Ⅱ) i...The luminophors of four kinds of alkaline earth meta-silicates doped with Eu^3 and/or Bi^(3+)ion(s)were synthesized and the luminescence properties of Bi^(3+)and Eu^(3+)ions were studied.The regularities that Me(Ⅱ) ions affect the luminescence of Eu^(3+)ion sensitized by Bi^(3+)ion were investigated.The optimum composition and synthesis condition were obtained.The absorption and emission peak are situated at 283 and 353nm with the optimum concentration 0.02 mol of Bi^(3+)in CaSiO_3:Bi.In CaSiO_3:Bi,the optimum concentration of Bi^(3+)is 0.007 mol and that of Eu^(3+)is 0.040 mol.For all of the alkaline earth ions concerned in MeSiO_3:Eu,Bi,the Bi^(3+)can sensitize the Eu^(3+)and the Me(Ⅱ)ions in host and make a great difference in the adsorption hand of Bi^(3+)ion.by exciting Bi^(3+)ion,the emissions are from both Eu^(3+)and Bi^(3+)ions and the best sensitization effect is achieved when Me(Ⅱ)is Sr.展开更多
Spherulites are generally fabricated from cooling polymer melts,while their fabrication under mild conditions or from small molecule materials has been barely reported.Besides,organic luminescent molecules typically s...Spherulites are generally fabricated from cooling polymer melts,while their fabrication under mild conditions or from small molecule materials has been barely reported.Besides,organic luminescent molecules typically suffer from low quantum yields in a solid state.Moreover,preparing material with interconnected and simultaneous changes in structural and fluorescent colors is challenging.Here,we present the first solution-derived spherulites with unique interconnected structural and fluorescent colors,self-assembled from stearoylated monosaccharides at room temperature.D-galactose stearoyl ester self-assembled into banded spherulites,containing twisted nanoplates and interconnected simultaneously changing structural and fluorescent colors.In comparison,D-mannose stearoyl ester can only form nonbanded spherulites,which contain oriented nanoplates and uniform structural and fluorescent colors.Such materials revealed a novel negative correlation between fluorescence and birefringence,termed alignment-promoted quenching propensity.Remarkably,the solid-state fluorescence quantum yields of galactose and mannosederived spherulites are as high as 49±2%and 51±2%respectively,approximately ten times higher than those of unmodified monosaccharides.These quantum yield values are among the highest of reported organic nonconventional fluorophores and even comparable to those of conventional aromatic chromophores.Moreover,these spherulites manifested an unexpected excitation-dependent multicolor photoluminescence with a broad-spectrum emission(410−620 nm).They show multiple peaks in the photoluminescent emission spectra and broad fluorescence lifetime distributions,which should be attributed to the clustering of a variety of oxygen-containing functional groups as emissive moieties.展开更多
Ultralong organic room-temperature phosphorescence(RTP)materials have attracted tremendous attention recently due to their diverse applications.Several ultralong organic RTP materials mimicking the host-vip architec...Ultralong organic room-temperature phosphorescence(RTP)materials have attracted tremendous attention recently due to their diverse applications.Several ultralong organic RTP materials mimicking the host-vip architecture of inorganic systems have been exploited successfully.However,complicated synthesis and high expenditure are still inevitable in these studies.Herein,we develop a series of novel host-vip organic phosphorescence systems,in which all luminophores are electron-rich,commercially available and halogen-atom-free.The maximum phosphorescence efficiency and the longest lifetime could reach 23.6%and 362 ms,respectively.Experimental results and theoretical calculation indicate that the host molecules not only play a vital role in providing a rigid environment to suppress non-radiative decay of the vip,but also show a synergistic effect to the vip through Förster resonance energy transfer(FRET).The commercial availability,facile preparation and unique properties also make these new host-vip materials an excellent candidate for the anti-counterfeiting application.This work will inspire researchers to develop new RTP systems with different wavelengths from commercially available luminophores.展开更多
Acenes with linearly fused benzene rings have attracted much attention due to their intriguing optical and electronic properties.Nevertheless,the poor ambient stability of longer acenes has hampered the investigation ...Acenes with linearly fused benzene rings have attracted much attention due to their intriguing optical and electronic properties.Nevertheless,the poor ambient stability of longer acenes has hampered the investigation of their physicochemical properties and potential applications.The incorporation of main group elements into the acene backbones provides a viable strategy to enhance the stability,and meanwhile,generates a new family of heteroatom-doped acenes(namely heteroacenes)with modified properties and functions.In particular,boron-containing acenes represent an attractive class of heteroacenes owing to the existence of vacant p orbital of boron,which endows theπ-conjugated systems with appealing features,such as Lewis acidity,electron-accepting capability,stimuli-responsivity,and adjustable photophysical properties.During the past decade,significant progress has been achieved in the synthesis and applications of boron-containing acenes,but a focused review on this topic has been elusive.Here,we summarize the recent advances in the studies on boron-containing acenes,covering their synthesis,intriguing properties,and various applications in electroluminescence and electronic devices,as well as in biosensors,etc.We hope that this timely review will stimulate new research interest in this unique family of materials and promote their optoelectronic applications.展开更多
Ⅰ. INTRODUCTION A kind of chemical wet process developed at the beginning of the seventies is the sol-gel method. Because of its lower synthesis temperature in inorganic materials, it is also called lowtemperature sy...Ⅰ. INTRODUCTION A kind of chemical wet process developed at the beginning of the seventies is the sol-gel method. Because of its lower synthesis temperature in inorganic materials, it is also called lowtemperature synthesis method. The sol-gel method has many obvious advantages compared with the high-temperature solid state reaction. On the one hand, the lower展开更多
基金supported by the National Natural Science Foundation of China(Nos.22174014 and 22074015)China Postdoctoral Science Foundation(No.2023M740595)+1 种基金Postdoctoral Fellowship Program of CPSF(No.GZC20230427)Jiangsu Funding Program for Excellent Postdoctoral Talent(No.2023ZB353).
文摘Developing efficient,non-toxic,and low-cost emitters is a key issue in promoting the applications of electrochemiluminescence(ECL).Among varied ECL emitters,polymeric emitters are attracting dramatically increasing interest due to tunable structure,large surface area,brilliant transfer capability,and sustainable raw materials.In this review,we present a general overview of recent advances in developing polymeric luminophores,including their structural and synthetic methodologies.Methods rooted in straightforward unique structural modulation have been comprehensively summarized,aiming at enhancing the efficiency of ECL along with the underlying kinetic mechanisms.Moreover,as several conjugated polymers were just discovered in recent years,promising prospects and perspectives have also been deliberated.The insight of this review may provide a new avenue for helping develop advanced conjugated polymer ECL emitters and decode ECL applications.
基金Project supported by the National Science Centre(NCN,Poland)(Grant DEC-2012/06/M/ST5/00325,Etiuda Project 2013/08/T/ST5/00490)
文摘Formation of dopant ions clusters in solid （glass） luminophores may affect efficiency of non-radiative energy transfer proc- esses between dopant （photoactivator） ions via shortening of the effective distance between them. This study was based on the as- sumption that the distance between the dopant ions affects the energy of crystal volume at proximity. According to this idea, semi-empirical and ab initio density functional theory （DFT） calculations were performed on various supercells of YVO4：Eu3＋ as a model system. It was noted that a shorter Eu-Eu distance resulted in lower total energy of the system, compared to an analogous structure with distant Eu3＋ ions. As lower energy configurations are preferred, the observed phenomenon was considered to be related to dopant ions clusters formation. Additionally, the values of energies obtained from DFT calculations were used to estimate the per- centage of dopant ions occurring as pairs, for different dopant concentrations. The estimation agreed quite well with the available lit- erature data.
基金financially supported by Qing Lan Project of Jiangsu Province and Postgraduate Research and Practice Innovation Program of Jiangsu Province(No.KYCX22_3293)IndustryUniversity-Research cooperation project of Jiangsu Province(No.BY20230314)Industry-University Research Cooperation Prospect Project of Zhangjiagang City(No.ZKYY2203)。
文摘Electrochemiluminescence has been developed as a robust analytical technique owing to its intrinsic advantages,such as near-zero background signal noise,wide dynamic ranges,high sensitivity and low cost and simple equipment.ECL luminophore as the critical component to generate light signals plays significant roles in this robust analytical system.Compared with traditional ECL luminophores,near infrared(NIR)ECL luminophores have attracted significant attentions recently due to their negligible autofluorescence,lower background interference and deep tissue penetration.Although substantial progresses have been achieved in exploring novel NIR ECL luminophores and elucidating their roles in addressing diverse challenges,there is still scarce of comprehensive reviews on the development of NIR ECL luminophores so far.In this review,the recent advancements on NIR ECL materials,including inorganic metal complexes,organic small molecules,metal nanoclusters,quantum dots and lanthanide-based materials,have been thoroughly summarized and discussed.In addition,we also provide a comprehensive overview of the challenges and prospects that lie ahead for the future development of NIR ECL luminophores in the future.
基金National Natural Science Foundation of China,Grant/Award Numbers:52173152,21805002The Fund of the Rising Stars of Shaanxi Province,Grant/Award Number:2021KJXX-48+5 种基金The Natural Science Basic Research Plan in Shaanxi Province of China,Grant/Award Number:2023-JC-QN-0163Young Talent Fund of University Association for Science and Technology in Shaanxi,China,Grant/Award Numbers:20190610,20210606Research Foundation of Education Department of Shaanxi Province,Grant/Award Number:21JK0487Scientific and Technological Innovation Team of Shaanxi Province,Grant/Award Number:2022TD-36Basic and Applied Basic Research Foundation of Guangdong Province,Grant/Award Number:2020A1515110476College Students’Innovative Entrepreneurial Training Plan Program of Baoji University of Arts and Sciences,Grant/Award Number:S202210721040。
文摘Solar-driven interfacial evaporation is a promising technology for desalination.The photothermal conversion materials are at the core and play a key role in thisfield.Design of photothermal conversion materials based on organic dyes for desalina-tion is still a challenge due to lack of efficient guiding strategy.Herein,a new D(donor)-A(acceptor)type conjugated tetraphenylpyrazine(TPP)luminophore(namely TPP-2IND)was prepared as a photothermal conversion molecule.It exhib-ited a broad absorption spectrum and strongπ–πstacking in the solid state,resulting in efficient sunlight harvesting and boosting nonradiative decay.TPP-2IND powder exhibited high photothermal efficiency upon 660 nm laser irradiation(0.9 W cm^(-2)),and the surface temperature can reach to 200℃.Then,an interfacial heating system based on TPP-2IND is established successfully.The water evaporation rate and the solar-driven water evaporation efficiency were evaluated up to 1.04 kg m^(-2) h^(-1) and 65.8%under 1 sunlight,respectively.Thus,this novel solar-driven heating system shows high potential for desalination and stimulates the development of advanced photothermal conversion materials.
基金supported by the National Natural Science Foundation of China(51822303,52073172)the Natural Science Foundation of Shanghai(20ZR1429400)+1 种基金“Shuguang Program”(20SG11)cosponsored by Shanghai Education Development Foundation and Shanghai Municipal Education Commissionthe State Key Laboratory of BioFibers and Eco-Textiles(Qingdao University,KF2020107)。
文摘Nonconventional luminophores have attracted significant attention for their unique photophysical properties and potential applications in different areas.Unlike classic luminogens consisting of remarkably conjugated segments,nonconventional luminophores generally possess merely nonconjugated or short-conjugated structures based on electron-rich units.Fluorescence,phosphorescence,and even color tunable room temperature phosphorescence(RTP)could be readily obtained from these unique luminophores.Herein,we summarized recent advances in the phosphorescence of nonconventional luminophores,with focus on RTP and color tunable RTP.The clustering-triggered emission(CTE)mechanism could be applied to explain the luminescence as clustering-triggered phosphorescence(CTP).Furthermore,strategies toward the RTP regulation are summarized,and corresponding applications are demonstrated.
基金supported by the National Natural Science Foundation of China(21901145,22171165)the financial support from Youth cross-scientific innovation group of Shandong University(2020QNQT003)the project of construction and management research of laboratory of Shandong University(sy20202202)
文摘Point-chiral groups as pendants conjugated to the aromatic luminophore generate weak chiroptical signals without self-assembly,showing the dependence on the flexibility of tethers,which hinders the development of point-chiral molecular materials with chiroptical properties such as the circularly polarized luminescence(CPL).Herein we introduce the molecular chiroptical materials based on the point chirality on a single benzene luminophore scaffold.Substitutes were stepwise conjugated to single benzene luminophores to boost the steric hindrance and tension,whereby the chirality transfer efficiency from point-chiral substituents to luminophores was enhanced.Multiple intramolecular CH-πinteractions anchor the whole asymmetric geometry with ultra-high rotation energy barriers and excellent thermostability.Dissymmetry g-factors of circular dichroism and CPL spectra up to 10^(-3)order of magnitude were realized in solutions,which are comparable to the inherent-chiral luminophores such as helicene and binaphthyl derivatives.The acridine-appended single benzene system shows the emergence of thermally activated delayed fluorescence(TADF),which extends the potentials of the single benzene chiral system in the TADF-based chiroptical devices.
基金the generous financial support of the National Key R&D Program of China(grant no.2019YFA0210100)the National Natural Science Foundation of China(grant nos.21890744 and 21877029)+1 种基金the Hunan Postgraduate Research and Innovation Project(grant no.CX2018B187)the China Postdoctoral Science Foundation(grant nos.2019TQ0085 and 2020M682538).
文摘Developing dual-state luminophores(DSLs)with strong fluorescence in both the monomer and aggregate states is urgently needed but remains a huge challenge because most current luminophores are either aggregation-induced emission or aggregation-caused quenching molecules.Moreover,limited by the structural conservation of the few existing DSLs,there are not enough response sites that can be used to customize various activatable fluorescent probes for specific molecular imaging.Herein,we engineered a general integration strategy for the fabrication of such DSLs with excellent photophysical properties.The DSLs,with their tunable spectra,a large Stokes shift(>170 nm),and achievable near-infrared(NIR)emission,show great potential for high-contrast imaging.Importantly,DSLs can be used as a universal platform for probe customization due to their activatable fluorescence through protection-deprotection of the phenolic hydroxyl group.Based on this,an NIR fluorescent probe DSL-Gal was developed for sensing of β-galactosidase in solutions,senescent cells,and liver metastases with high contrast,further confirming the superiority and universal feasibility of DSLs in probe design.The integration strategy may provide a novel approach for the generation of other DSLs and have great potential applications in bioimaging.
文摘Perovskite(PRV)luminescent solar concentrators(LSCs)use PRV materials to concentrate and convert sunlight into electricity.LSCs are made up of a flat plate or sheet of glass or plastic that contains a layer of luminescent PRV material.When sunlight enters the LSC,the PRV material absorbs the light and emits it at a longer wavelength.This emitted light is then trapped inside the LSC by total internal reflection,and it travels to the edges of the plate where it is collected by photovoltaic(PV)solar cells(SCs).The use of PRV materials in LSCs offers several advantages over other materials.PRV materials are highly efficient at converting light into electricity.They are also flexible,low-cost,and easy to manufacture,making them a promising candidate for large-scale solar energy applications.However,PRV materials have some challenges preventing their adoption.They are sensitive to moisture or heat and can degrade quickly over time.This significantly limits their lifespan and stability.Research on PRV is mostly focused on making them more stable and durable,but finding ways to improve the manufacturing process to reduce costs and increase efficiency is also relevant.While the opportunities offered by PRV materials for the specific application to LCSs are certainly interesting,the challenges make the prospect of a commercial product very unlikely in the short term.
基金supported by the National Natural Science Foundation of China(21975061)Shenzhen Fundamental Research Program(JCYJ20190806142403535,GXWD20201230155427003-20200728150952003)
文摘The construction of molecular chirality is crucial for exploring novel luminophores with chiroptical properties.Classic asymmetric synthesis of chiral center or axial is not powerful enough on through-space architecture.Accessible methodologies for breaking molecular symmetry could be promising but remain less investigated.Herein,we report a novel methodology for constructing chiral through-space luminophores via simple chlorination on bridged carbazole motifs.The chlorination breaks the molecular symmetry and thus results in molecular chirality by eliminating the mirror plane or rotating axis.Interestingly,continuous multiple chlorinations can rebuild and break the symmetry of the skeleton in succession.Several chiral and achiral isomeric analogues are synthesized and characterized with impressive chiroptical properties.Results of chiral high performance liquid chromatography(HPLC),single-crystal X-ray diffraction,kinetic racemization,and chiroptical property investigation demonstrate the effectiveness of our rational design strategy.It provides a feasible methodology for exploring novel chiral luminescent materials based on versatile though-space skeletons.
基金supported by the National Natural Science Foundation of China(Nos.:11872038 and 11725209)funding from Gas Turbine Research Institute of Shanghai Jiao Tong University。
文摘The thermal stability of sprayable fast-responding Pressure-Sensitive Paint(fast PSP)was investigated to explore the possibility for application in turbomachinery and hypersonic research with temperature above 100℃.The first part of the study focused on a widely-used Polymer Ceramic PSP(PC-PSP).The effects of thermal degradation on its key sensing properties,including luminescent intensity,pressure sensitivity and response time,were examined for a temperature range from 60 to 100℃.Severe degradation in intensity and pressure sensitivity was found as temperature reached 70℃or higher,which would cause failure of PSP application in these conditions.Subsequently,a fast-responding Mesoporous-Particle PSP(MP-PSP)was developed which did not show degradation effects until 140℃.The greatly improved thermal stability of MP-PSP was attributed to:selection of polymer with higher glass transition temperature(polystyrene)to delay the saturation effect of oxygen quenching as temperature increased;porous and hollow structure of particles for luminophore deposition that minimizes polymer–luminophore interaction.This new paint formulation has significantly raised the upper temperature limit of fast PSP and offers more opportunities for applications in harsh environment.
基金The financial support from the National Key Research and Development Program of China(No.2022YFE0201800)Shenzhen Science and Technology Innovation Commission(Nos.GJHZ20210705142200001 and JCYJ20210324140004013)Guangdong Natural Science Foundation(Nos.2021A1515220020 and 2020B1212060077)is gratefully acknowledged。
文摘Point-of-care testing(POCT)technology is highly desirable for clinical diagnosis,healthcare monitoring,food safety inspection,and environment surveillance,because it enables rapid detection anywhere,anytime,and by anyone.Electrochemiluminescence(ECL)has been widely used in chemo-/bio analysis due to its advantages such as high sensitivity,simplicity,rapidity and easy to control,and is now attracting increasing attention for POCT applications.However,to realize the accurate on-site quantitation,it is still challenging to develop portable devices which can precisely collect,analyze,transmit and display the ECL signals.This review will focus on how to develop a portable ECL device by summarizing recent examples and analyzing their key components part by part.Then the possible solutions to the existing challenges in the development and applications of portable ECL devices are summarized and discussed in detail,followed by offering future perspectives.We attempted to provide an appealing viewpoint to inspire interested researchers to comprehend and explore portable ECL sensing systems for practical applications and even commercialization.
基金Project supported by International Visegrad Fund (51000547 (2010-2011))
文摘Mixed strontium-yttrium borate phosphor Sr3Y2（BO3）4 doped with Eu^3＋ ions was obtained by the sol-gel Pechini method. Crystal structure of the synthesized compound was analyzed by X-ray powder diffraction. Optimal conditions for the synthesis were found. Photophysical properties of the phosphor samples were investigated by collecting excitation and luminescence spectra as well as measuring lumi- nescence lifetime. Judd-Ofelt analysis showed that Eu^3＋ ions occupied Y^3＋ sites in the crystalline network. The studied compound showed a red emission with the quantum yield of 54%-55% and can be potentially used as phosphor for plasma display panels and luminescent tubes.
文摘The luminophors of four kinds of alkaline earth meta-silicates doped with Eu^3 and/or Bi^(3+)ion(s)were synthesized and the luminescence properties of Bi^(3+)and Eu^(3+)ions were studied.The regularities that Me(Ⅱ) ions affect the luminescence of Eu^(3+)ion sensitized by Bi^(3+)ion were investigated.The optimum composition and synthesis condition were obtained.The absorption and emission peak are situated at 283 and 353nm with the optimum concentration 0.02 mol of Bi^(3+)in CaSiO_3:Bi.In CaSiO_3:Bi,the optimum concentration of Bi^(3+)is 0.007 mol and that of Eu^(3+)is 0.040 mol.For all of the alkaline earth ions concerned in MeSiO_3:Eu,Bi,the Bi^(3+)can sensitize the Eu^(3+)and the Me(Ⅱ)ions in host and make a great difference in the adsorption hand of Bi^(3+)ion.by exciting Bi^(3+)ion,the emissions are from both Eu^(3+)and Bi^(3+)ions and the best sensitization effect is achieved when Me(Ⅱ)is Sr.
基金EU,Grant/Award Number:NEuM(ZW7-85191973)German Research Foundation(DFG),Grant/Award Numbers:ZH 546/8-1,INST186/1397-1/FUGG,INST208/761-1FUGG+3 种基金Lower Saxony Ministry of Science and Culture,Grant/Award Number:INST186/1397-1/FUGGChina Scholarship CouncilNatural Sciences and Engineering Research Council of CanadaAlexander von Humboldt Foundation。
文摘Spherulites are generally fabricated from cooling polymer melts,while their fabrication under mild conditions or from small molecule materials has been barely reported.Besides,organic luminescent molecules typically suffer from low quantum yields in a solid state.Moreover,preparing material with interconnected and simultaneous changes in structural and fluorescent colors is challenging.Here,we present the first solution-derived spherulites with unique interconnected structural and fluorescent colors,self-assembled from stearoylated monosaccharides at room temperature.D-galactose stearoyl ester self-assembled into banded spherulites,containing twisted nanoplates and interconnected simultaneously changing structural and fluorescent colors.In comparison,D-mannose stearoyl ester can only form nonbanded spherulites,which contain oriented nanoplates and uniform structural and fluorescent colors.Such materials revealed a novel negative correlation between fluorescence and birefringence,termed alignment-promoted quenching propensity.Remarkably,the solid-state fluorescence quantum yields of galactose and mannosederived spherulites are as high as 49±2%and 51±2%respectively,approximately ten times higher than those of unmodified monosaccharides.These quantum yield values are among the highest of reported organic nonconventional fluorophores and even comparable to those of conventional aromatic chromophores.Moreover,these spherulites manifested an unexpected excitation-dependent multicolor photoluminescence with a broad-spectrum emission(410−620 nm).They show multiple peaks in the photoluminescent emission spectra and broad fluorescence lifetime distributions,which should be attributed to the clustering of a variety of oxygen-containing functional groups as emissive moieties.
基金This work was supported by the National Natural Science Foundation of China(21788102 and 21525417)the Natural Science Foundation of Guangdong Province(2019B030301003 and 2016A030312002)the Innovation and Technology Commission of Hong Kong(ITC-CNERC14S01).
文摘Ultralong organic room-temperature phosphorescence(RTP)materials have attracted tremendous attention recently due to their diverse applications.Several ultralong organic RTP materials mimicking the host-vip architecture of inorganic systems have been exploited successfully.However,complicated synthesis and high expenditure are still inevitable in these studies.Herein,we develop a series of novel host-vip organic phosphorescence systems,in which all luminophores are electron-rich,commercially available and halogen-atom-free.The maximum phosphorescence efficiency and the longest lifetime could reach 23.6%and 362 ms,respectively.Experimental results and theoretical calculation indicate that the host molecules not only play a vital role in providing a rigid environment to suppress non-radiative decay of the vip,but also show a synergistic effect to the vip through Förster resonance energy transfer(FRET).The commercial availability,facile preparation and unique properties also make these new host-vip materials an excellent candidate for the anti-counterfeiting application.This work will inspire researchers to develop new RTP systems with different wavelengths from commercially available luminophores.
基金financial support from the National Natural Science Foundation of China(Nos.92256304 and 22071120)the National Key R&D Program of China(2020YFA0711500)the Fundamental Research Funds for the Central Universities.
文摘Acenes with linearly fused benzene rings have attracted much attention due to their intriguing optical and electronic properties.Nevertheless,the poor ambient stability of longer acenes has hampered the investigation of their physicochemical properties and potential applications.The incorporation of main group elements into the acene backbones provides a viable strategy to enhance the stability,and meanwhile,generates a new family of heteroatom-doped acenes(namely heteroacenes)with modified properties and functions.In particular,boron-containing acenes represent an attractive class of heteroacenes owing to the existence of vacant p orbital of boron,which endows theπ-conjugated systems with appealing features,such as Lewis acidity,electron-accepting capability,stimuli-responsivity,and adjustable photophysical properties.During the past decade,significant progress has been achieved in the synthesis and applications of boron-containing acenes,but a focused review on this topic has been elusive.Here,we summarize the recent advances in the studies on boron-containing acenes,covering their synthesis,intriguing properties,and various applications in electroluminescence and electronic devices,as well as in biosensors,etc.We hope that this timely review will stimulate new research interest in this unique family of materials and promote their optoelectronic applications.
基金Project supported by the National Natural Science Foundation of China.
文摘Ⅰ. INTRODUCTION A kind of chemical wet process developed at the beginning of the seventies is the sol-gel method. Because of its lower synthesis temperature in inorganic materials, it is also called lowtemperature synthesis method. The sol-gel method has many obvious advantages compared with the high-temperature solid state reaction. On the one hand, the lower
