Optoelectronic materials are essential for today's scientific and technological development,and machine learning provides new ideas and tools for their research.In this paper,we first summarize the development his...Optoelectronic materials are essential for today's scientific and technological development,and machine learning provides new ideas and tools for their research.In this paper,we first summarize the development history of optoelectronic materials and how materials informatics drives the innovation and progress of optoelectronic materials and devices.Then,we introduce the development of machine learning and its general process in optoelectronic materials and describe the specific implementation methods.We focus on the cases of machine learning in several application scenarios of optoelectronic materials and devices,including the methods related to crystal structure,properties(defects,electronic structure)research,materials and devices optimization,material characterization,and process optimization.In summarizing the algorithms and feature representations used in different studies,it is noted that prior knowledge can improve optoelectronic materials design,research,and decision-making processes.Finally,the prospect of machine learning applications in optoelectronic materials is discussed,along with current challenges and future directions.This paper comprehensively describes the application value of machine learning in optoelectronic materials research and aims to provide reference and guidance for the continuous development of this field.展开更多
Near-infrared(NIR)light has shown great potential for military and civilian applications owing to its advantages in the composition of sunlight,invisibility to human eyes,deeper penetration into biological tissues,and...Near-infrared(NIR)light has shown great potential for military and civilian applications owing to its advantages in the composition of sunlight,invisibility to human eyes,deeper penetration into biological tissues,and low optical loss in optical fibers.Therefore,organic optoelectronic materials that can absorb or emit NIR light have aroused great scientific interest in basic science and practical applications.Based on these NIR organic optoelectronic materials,NIR optoelectronic devices have been greatly improved in performance and application.In this review,the representative NIR organic optoelectronic materials used in organic solar cells,organic photodetectors,organic light-emitting diodes,organic lasers,and organic optical waveguide devices are briefly introduced,and the potential applications of each kind of device are briefly summarized.Finally,we summarize and take up the development of NIR organic optoelectronic materials and devices.展开更多
In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applic...In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applications.Spiro[fluorene-9,9′-xanthene](SFX)has been becoming the robust building-block that fulfilling the practical requirements due to its key features of non-planarity,one-pot facile availability,well-defined quality assurance as well as performance behaviors.In this review,we introduce the SFX and its analogues,including synthesis,molecular design,device performance,and structure-property relationship,in the applications of organic light-emitting diodes(OLEDs),organic photovoltaics,perovskite solar cells(PSCs)and others.Furthermore,emitters or hosts for OLED and hole transport materials for PSCs are highlighted at the level of molecular configuration and film morphology.Tracing the thread from intrinsic photoelectric properties,molecular packing to optoelectronic application,the advantage of stability and low-cost of SFX-based materials are illuminated,and an outlook is given providing orientation for bring SFX into the fields of catalysis and energy chemistry in view of its binary conjugation and three-dimensional configuration.展开更多
Trger's base (TB) is a well-known chiral molecule with rigid concave shape that makes it applicable in different areas such as superamolecular chemistry,molecular recognition,biological labeling,and so on.In this ...Trger's base (TB) is a well-known chiral molecule with rigid concave shape that makes it applicable in different areas such as superamolecular chemistry,molecular recognition,biological labeling,and so on.In this article,we briefly summarize some recent research progress in the optoelectronic properties of novel TB analogues and their applications in optoelectronic field with emphasis on the developments achieved in our group.展开更多
Organic optoelectronic materials have received considerable attention due to their great potentials in electronic devices,such as organic field-effect transistors(OFETs),organic light-emit-ting diodes(OLED)and organic...Organic optoelectronic materials have received considerable attention due to their great potentials in electronic devices,such as organic field-effect transistors(OFETs),organic light-emit-ting diodes(OLED)and organic photovoltaic cells(OPV).Besides,their fascinating properties of flexibility,biocompatibility,molecular diversity,low-cost and solution processability bring new opportunities in bioelectronics in the past decade.While almost all known organic optoelectronic materials are obtained from unrenewable fossil resources and nondegradable,a new family of organic optoelectronic materials is now emerging,which can be obtained from green plants and are biodegradable.Meanwhile,they exhibit excellent optoelectronic properties.This review summarized the synthesis and important molecular properties of this new class of biodegradable organic opto-electronic materials:α-oligofurans.Recent progress of furan-based materials and the existing chal-lenges are also discussed to stimulate further advances in the study of this class of materials.展开更多
Synthesis of the optoelectronic storage material with structure for coating by nanosized metal and azo-dye was reported. The characterization of composites was made by using transmission electron microscope （TEM）, u...Synthesis of the optoelectronic storage material with structure for coating by nanosized metal and azo-dye was reported. The characterization of composites was made by using transmission electron microscope （TEM）, ultraviolet-visible spectrometer （UV-Vis） and thermogravity analyzer （TGA）. It is found that, due to the specific structure, in which azo-dye molecules are oriented and adsorbed on the spherical surface of nanosized metal, the absorption maximum of azo-dye methyl orange shift towards shorter wavelength band. The experimental results show that the proposed technique here wouM offer a promising way to synthesize short wavelength optoelectronic storage material by doping of metal nanoparticles coated with dyes in polymer. Furthermore, the composites based on the structure can present excellent thermal properties suitable for the requirements of optical storage. This new type of material is capable of matching semiconductor laser （GaN） in optoelectronic storage technology.展开更多
The electronic,optoelectronic and photonic materials are the fundamental materials for the information technology(IT).These materials are the drivers of the information and communication revolutions.Different kinds of...The electronic,optoelectronic and photonic materials are the fundamental materials for the information technology(IT).These materials are the drivers of the information and communication revolutions.Different kinds of artificial crystals are situated at the center of these materials.In the 21st century(“Tera” Era)the electronic and photonic materials still serve as the basic materials for the global IT.This paper will evaluate the present situation and the prospect of artificial crystals with a view of development from electronic materials to the photonic materials.展开更多
The research on circularly polarized luminescence(CPL)has garnered significant attention in recent years due to its many potential applications.One aspect of this research involves the pursuit of chiral materials that...The research on circularly polarized luminescence(CPL)has garnered significant attention in recent years due to its many potential applications.One aspect of this research involves the pursuit of chiral materials that posess both high luminescence efficiency and dissymmetry factors.The investigation of CPL behavior is of paramount importance because the structural information of chiral luminescent systems in the excited state can be uncovered.The objective of this review is to offer a comprehensive overview of the latest advancements in the CPL research field,with a particular focus on the development of chiral emissive materials,including organic,inorganic,and hybrid substances.Furthermore,this review outlines the recent applications of these materials in areas such as displays,photoelectric devices,anticounterfeiting measures,and sensors.Finally,we highlight the primary challenges and potential prospects of CPL materials.Our aspiration is that this endeavor will contribute new perspectives and insights that further advancements in related research fields.展开更多
A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structtire Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretical...A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structtire Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretically and experimentally. The electro-optic ceramic is used as a phase retarder for the clockwise and counter-clockwise polarized light, and their po- larization directions are adjusted to their orthogonal positions by using two half-wave plates. The output light then becomes polarization-independent with respect to the polarization direction of the input light. The switch characteristics, including splitter ratios and polarization states, are theoretically analyzed and simulated in detail by the matrix multiplication method. An experimental setup is built to verify the analysis and experimental results. A new component ceramic is used and a non- polarizing cube beam splitter （NPBS） replaces the beam splitter （BS） to lower the ON/OFF voltage to 305 V and improve the extinction ratio by 2 dB. Finally, the laser-induced damage threshold for the proposed switch is measured and discussed. It is believed that potential applications of this novel polarization-independent electro-optic switch technology will be wide, especially for ultrafast high-power laser systems.展开更多
Inhomogeneous Pb/Sn elemental distribution and the resulted phase segregation in mixed Pb-Sn halide perovskites would result in energy disorder(band structure and phase distribution disorder),which greatly limits thei...Inhomogeneous Pb/Sn elemental distribution and the resulted phase segregation in mixed Pb-Sn halide perovskites would result in energy disorder(band structure and phase distribution disorder),which greatly limits their photovoltaic performance.Here,Pb S quantum dot has been synthesized and demonstrated as seeds for modulation crystallization dynamics of the mixed Pb-Sn inorganic perovskites,allowing an enhanced film quality and significantly suppressing phase segregation.With this additive power conversion efficiency of 8%and 6%is obtained under irradiation of full sunlight in planar and mesoporous structured solar cells in combination with CsPb_(0.5) Sn_(0.5)I_(2)Br inorganic perovskite,respectively.Our finding reveals exploring the actual Pb/Sn atoms location in perovskite structure and its influence on developing efficient and stable low-bandgap perovskite solar cells.展开更多
The inherent advantages of organic optoelectronic materials endow lightharvesting systems,including organic photovoltaics(OPVs)and organic photodiodes(OPDs),with multiple advantages,such as low-cost manufacturing,ligh...The inherent advantages of organic optoelectronic materials endow lightharvesting systems,including organic photovoltaics(OPVs)and organic photodiodes(OPDs),with multiple advantages,such as low-cost manufacturing,light weight,flexibility,and applicability to large-area fabrication,make them promising competitors with their inorganic counterparts.Among them,nearinfrared(NIR)organic optoelectronic materials occupy a special position and have become the subject of extensive research in both academia and industry.The introduction of NIR materials into OPVs extends the absorption spectrum range,thereby enhancing the photon-harvesting ability of the devices,due to which they have been widely used for the construction of semitransparent solar cells with single-junction or tandem architectures.NIR photodiodes have tremendous potential in industrial,military,and scientific applications,such as remote control of smart electronic devices,chemical/biological sensing,environmental monitoring,optical communication,and so forth.These practical and potential applications have stimulated the development of NIR photoelectric materials,which in turn has given impetus to innovation in light-harvesting systems.In this review,we summarize the common molecular design strategies of NIR photoelectric materials and enumerate their applications in OPVs and OPDs.展开更多
Organic optoelectronic materials have attracted extensive attention in the past decades due to their wide applications in organic light‐emitting diodes(OLEDs),organic photovoltaics(OPVs),photocatalysis,etc.Significan...Organic optoelectronic materials have attracted extensive attention in the past decades due to their wide applications in organic light‐emitting diodes(OLEDs),organic photovoltaics(OPVs),photocatalysis,etc.Significant ad-vancements have been obtained in the material designs based on the insight into the fundamental physics of exciton related to molecular stacking patterns in solid/condensed states.The exciton characteristics and behaviors are not only a starting point for studying photophysical and photochemical processes on a microscopic level,but also a crucial point in determining the optoelec-tronic properties of macroscopic aggregates.This review summarizes the historic development of exciton models,accompanied by the discoveries of special molecular stacking patterns(H‐/J‐/X‐/M‐aggregates),and the competitive de‐excitation pathways of excitons including fluorescence,energy transfer,singlet fission,excimer formation and symmetry‐breaking charge separation in the confined aggregate structures.Additionally,it highlights the capabilities of a correlation between molecular stacking modes and exciton behaviors,which provides new insights and perspectives for optimizing exciton character and behavior through the modulation of molecular arrangement in aggregate states,thereby enhancing the performance of optoelectronic materials.展开更多
Good film formation is one of basic requirements for organic optoelectronic materials to achieve the capability for fabrication of large area devices. Small molecular optoelectronic compounds have a definite chemical ...Good film formation is one of basic requirements for organic optoelectronic materials to achieve the capability for fabrication of large area devices. Small molecular optoelectronic compounds have a definite chemical structure and clear device performance, and thus are welcomed in the field. However, they are generally suffering from poor film formation, especially in a large area. For addressing it, this contribution proposes and demonstrates a strategy, that is, changing them into poly（rod-coil） polymers. With one optoelectronic compound [BDT（DTBT）2] and three poly（rod-coil） polymers （P1, P2, and P3） having different non-conjugated coil segments as examples, the work clearly shows that the change to poly（rod-coil） polymers keeps many basic optoelectronic properties of the refer- ence compound, including light absorption in solution, bandgap and frontier orbital energy levels, but suppresses strong intermolecular interactions and crystalline structure in film state. Further comparisons on film formation quality on glass and ITO glass illustrate that all the three polymers have a better film formation property than the reference compound.展开更多
Metal-halide perovskites are novel optoelectronic materials that are considered good candidates for solar harvesting and light emitting applications. In this study, we develop a reproducible and low-cost approach for ...Metal-halide perovskites are novel optoelectronic materials that are considered good candidates for solar harvesting and light emitting applications. In this study, we develop a reproducible and low-cost approach for synthesizing high- quality cesium lead halide perovskite （CsPbX3, X = CI, Br, and I or C1/Br and I/Br） nanocrystals （NCs） by direct heating of precursors in octadecene in air. Experimental results show that the particle size and composition of as-prepared CsPbX3 nanocrystals can be successfully tuned by a simple variation of reaction temperature. The emission peak positions of the as-prepared nanocrystals can be conveniently tuned from the UV to the NIR （360-700 nm） region, and the quantum yield of the as-obtained samples （green and red emissions） can reach up to 87%. The structures and chemical compositions of the as-obtained NCs were characterized by transmission electron microscopy, X-ray diffraction, and elemental analysis. This proposed synthetic route can yield large amounts of high-quality NCs with a one-batch reaction, usually on the gram scale, and could pave the way for further applications of perovskite-based light-emitting and photovoltaic solar cells.展开更多
Conductive coordination polymers(CCPs)have shown great potential for electronic purposes.However,their applications in photodetection have been limited by poor sensitivity,low on/off current ratio,and slow response ow...Conductive coordination polymers(CCPs)have shown great potential for electronic purposes.However,their applications in photodetection have been limited by poor sensitivity,low on/off current ratio,and slow response owing to the low charge generation and/or separation efficiency.In this work,metal-to-ligand chargetransfer(MLCT)in PhSeAg was used to fabricate a single-component MLCT photodetecting material for the first time to solve the above challenges.The material obtained possesses ultrahigh sensitivity to weak-light intensity(0.03 mW cm^(−2)),the highest on/off ratio,and the fastest response speed than other wellknown CCPs materials tested.Our work might provide a simple but common strategy for designing high-performance CCPs composites for optoelectrical applications.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.61601198)the University of Jinan PhD Foundation (Grant No.XBS1714)。
文摘Optoelectronic materials are essential for today's scientific and technological development,and machine learning provides new ideas and tools for their research.In this paper,we first summarize the development history of optoelectronic materials and how materials informatics drives the innovation and progress of optoelectronic materials and devices.Then,we introduce the development of machine learning and its general process in optoelectronic materials and describe the specific implementation methods.We focus on the cases of machine learning in several application scenarios of optoelectronic materials and devices,including the methods related to crystal structure,properties(defects,electronic structure)research,materials and devices optimization,material characterization,and process optimization.In summarizing the algorithms and feature representations used in different studies,it is noted that prior knowledge can improve optoelectronic materials design,research,and decision-making processes.Finally,the prospect of machine learning applications in optoelectronic materials is discussed,along with current challenges and future directions.This paper comprehensively describes the application value of machine learning in optoelectronic materials research and aims to provide reference and guidance for the continuous development of this field.
基金the financial support from the National Natural Science Foundation of China(Grant Nos.52173177,21971185,22105139)the Natural Science Foundation of Jiangsu Province(Grant No.BK20221362)+4 种基金the Science and Technology Support Program of Jiangsu Province(Grant No.TJ-2022-002)supported by the Suzhou Key Laboratory of Functional Nano&Soft Materials,Collaborative Innovation Center of Suzhou Nano Science&Technologythe 111 ProjectJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow University Tang Scholar
文摘Near-infrared(NIR)light has shown great potential for military and civilian applications owing to its advantages in the composition of sunlight,invisibility to human eyes,deeper penetration into biological tissues,and low optical loss in optical fibers.Therefore,organic optoelectronic materials that can absorb or emit NIR light have aroused great scientific interest in basic science and practical applications.Based on these NIR organic optoelectronic materials,NIR optoelectronic devices have been greatly improved in performance and application.In this review,the representative NIR organic optoelectronic materials used in organic solar cells,organic photodetectors,organic light-emitting diodes,organic lasers,and organic optical waveguide devices are briefly introduced,and the potential applications of each kind of device are briefly summarized.Finally,we summarize and take up the development of NIR organic optoelectronic materials and devices.
基金support by the the Sci-ence Research Plan of Shenyang University of Chemical Technol-ogy(XXLJ2019006)the Natural Science Foundation of Liaoning Province(2021-MS-254).
文摘In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applications.Spiro[fluorene-9,9′-xanthene](SFX)has been becoming the robust building-block that fulfilling the practical requirements due to its key features of non-planarity,one-pot facile availability,well-defined quality assurance as well as performance behaviors.In this review,we introduce the SFX and its analogues,including synthesis,molecular design,device performance,and structure-property relationship,in the applications of organic light-emitting diodes(OLEDs),organic photovoltaics,perovskite solar cells(PSCs)and others.Furthermore,emitters or hosts for OLED and hole transport materials for PSCs are highlighted at the level of molecular configuration and film morphology.Tracing the thread from intrinsic photoelectric properties,molecular packing to optoelectronic application,the advantage of stability and low-cost of SFX-based materials are illuminated,and an outlook is given providing orientation for bring SFX into the fields of catalysis and energy chemistry in view of its binary conjugation and three-dimensional configuration.
基金financially supported by the National Natural Science Foundation of China (50721002,50990061,and 50802054)National Basic Research Program of China (973 program) (2010CB630702)
文摘Trger's base (TB) is a well-known chiral molecule with rigid concave shape that makes it applicable in different areas such as superamolecular chemistry,molecular recognition,biological labeling,and so on.In this article,we briefly summarize some recent research progress in the optoelectronic properties of novel TB analogues and their applications in optoelectronic field with emphasis on the developments achieved in our group.
文摘Organic optoelectronic materials have received considerable attention due to their great potentials in electronic devices,such as organic field-effect transistors(OFETs),organic light-emit-ting diodes(OLED)and organic photovoltaic cells(OPV).Besides,their fascinating properties of flexibility,biocompatibility,molecular diversity,low-cost and solution processability bring new opportunities in bioelectronics in the past decade.While almost all known organic optoelectronic materials are obtained from unrenewable fossil resources and nondegradable,a new family of organic optoelectronic materials is now emerging,which can be obtained from green plants and are biodegradable.Meanwhile,they exhibit excellent optoelectronic properties.This review summarized the synthesis and important molecular properties of this new class of biodegradable organic opto-electronic materials:α-oligofurans.Recent progress of furan-based materials and the existing chal-lenges are also discussed to stimulate further advances in the study of this class of materials.
基金Supported by the National Natural Science Foundation of China (No. 50271038) and the Key Research Project Foundation of Shaanxi Normal University (No.200403)
文摘Synthesis of the optoelectronic storage material with structure for coating by nanosized metal and azo-dye was reported. The characterization of composites was made by using transmission electron microscope （TEM）, ultraviolet-visible spectrometer （UV-Vis） and thermogravity analyzer （TGA）. It is found that, due to the specific structure, in which azo-dye molecules are oriented and adsorbed on the spherical surface of nanosized metal, the absorption maximum of azo-dye methyl orange shift towards shorter wavelength band. The experimental results show that the proposed technique here wouM offer a promising way to synthesize short wavelength optoelectronic storage material by doping of metal nanoparticles coated with dyes in polymer. Furthermore, the composites based on the structure can present excellent thermal properties suitable for the requirements of optical storage. This new type of material is capable of matching semiconductor laser （GaN） in optoelectronic storage technology.
文摘The electronic,optoelectronic and photonic materials are the fundamental materials for the information technology(IT).These materials are the drivers of the information and communication revolutions.Different kinds of artificial crystals are situated at the center of these materials.In the 21st century(“Tera” Era)the electronic and photonic materials still serve as the basic materials for the global IT.This paper will evaluate the present situation and the prospect of artificial crystals with a view of development from electronic materials to the photonic materials.
基金supported by the Chirality Major Research Plan of the National Natural Science Foundation of China(grant nos.92256304 and 92056204).
文摘The research on circularly polarized luminescence(CPL)has garnered significant attention in recent years due to its many potential applications.One aspect of this research involves the pursuit of chiral materials that posess both high luminescence efficiency and dissymmetry factors.The investigation of CPL behavior is of paramount importance because the structural information of chiral luminescent systems in the excited state can be uncovered.The objective of this review is to offer a comprehensive overview of the latest advancements in the CPL research field,with a particular focus on the development of chiral emissive materials,including organic,inorganic,and hybrid substances.Furthermore,this review outlines the recent applications of these materials in areas such as displays,photoelectric devices,anticounterfeiting measures,and sensors.Finally,we highlight the primary challenges and potential prospects of CPL materials.Our aspiration is that this endeavor will contribute new perspectives and insights that further advancements in related research fields.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61137004,61405218,and 61535014)
文摘A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structtire Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretically and experimentally. The electro-optic ceramic is used as a phase retarder for the clockwise and counter-clockwise polarized light, and their po- larization directions are adjusted to their orthogonal positions by using two half-wave plates. The output light then becomes polarization-independent with respect to the polarization direction of the input light. The switch characteristics, including splitter ratios and polarization states, are theoretically analyzed and simulated in detail by the matrix multiplication method. An experimental setup is built to verify the analysis and experimental results. A new component ceramic is used and a non- polarizing cube beam splitter （NPBS） replaces the beam splitter （BS） to lower the ON/OFF voltage to 305 V and improve the extinction ratio by 2 dB. Finally, the laser-induced damage threshold for the proposed switch is measured and discussed. It is believed that potential applications of this novel polarization-independent electro-optic switch technology will be wide, especially for ultrafast high-power laser systems.
基金Financial support from the National Key Research and Development Program of China (2019YFE0101300, 2018YFB1502900)the National Natural Science Foundation of China (No. 21975088)+1 种基金the National Natural Science Foundation of China Major International (Regional) Joint Research Project (No. 51961165106)the double first-class research funding of China-EU Institute for Clean and Renewable Energy (3011187029)。
文摘Inhomogeneous Pb/Sn elemental distribution and the resulted phase segregation in mixed Pb-Sn halide perovskites would result in energy disorder(band structure and phase distribution disorder),which greatly limits their photovoltaic performance.Here,Pb S quantum dot has been synthesized and demonstrated as seeds for modulation crystallization dynamics of the mixed Pb-Sn inorganic perovskites,allowing an enhanced film quality and significantly suppressing phase segregation.With this additive power conversion efficiency of 8%and 6%is obtained under irradiation of full sunlight in planar and mesoporous structured solar cells in combination with CsPb_(0.5) Sn_(0.5)I_(2)Br inorganic perovskite,respectively.Our finding reveals exploring the actual Pb/Sn atoms location in perovskite structure and its influence on developing efficient and stable low-bandgap perovskite solar cells.
基金Foundation of Guangzhou Science and Technology Project,Grant/Award Number:201707020019Natural Science Foundation of China,Grant/Award Numbers:21520102006,21634004。
文摘The inherent advantages of organic optoelectronic materials endow lightharvesting systems,including organic photovoltaics(OPVs)and organic photodiodes(OPDs),with multiple advantages,such as low-cost manufacturing,light weight,flexibility,and applicability to large-area fabrication,make them promising competitors with their inorganic counterparts.Among them,nearinfrared(NIR)organic optoelectronic materials occupy a special position and have become the subject of extensive research in both academia and industry.The introduction of NIR materials into OPVs extends the absorption spectrum range,thereby enhancing the photon-harvesting ability of the devices,due to which they have been widely used for the construction of semitransparent solar cells with single-junction or tandem architectures.NIR photodiodes have tremendous potential in industrial,military,and scientific applications,such as remote control of smart electronic devices,chemical/biological sensing,environmental monitoring,optical communication,and so forth.These practical and potential applications have stimulated the development of NIR photoelectric materials,which in turn has given impetus to innovation in light-harvesting systems.In this review,we summarize the common molecular design strategies of NIR photoelectric materials and enumerate their applications in OPVs and OPDs.
基金State Key Lab of Luminescent Materials and Devices,South China University of Technology.National Natural Science Foundation of China,Grant/Award Numbers:21975076,52003089,52103206,52373178+2 种基金Fund of the Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province,Grant/Award Number:2019B030301003Ministry of Science and Technology of the People's Republic of China,Grant/Award Number:2022YFA1204404111 Project,Grant/Award Number:G2022163017L。
文摘Organic optoelectronic materials have attracted extensive attention in the past decades due to their wide applications in organic light‐emitting diodes(OLEDs),organic photovoltaics(OPVs),photocatalysis,etc.Significant ad-vancements have been obtained in the material designs based on the insight into the fundamental physics of exciton related to molecular stacking patterns in solid/condensed states.The exciton characteristics and behaviors are not only a starting point for studying photophysical and photochemical processes on a microscopic level,but also a crucial point in determining the optoelec-tronic properties of macroscopic aggregates.This review summarizes the historic development of exciton models,accompanied by the discoveries of special molecular stacking patterns(H‐/J‐/X‐/M‐aggregates),and the competitive de‐excitation pathways of excitons including fluorescence,energy transfer,singlet fission,excimer formation and symmetry‐breaking charge separation in the confined aggregate structures.Additionally,it highlights the capabilities of a correlation between molecular stacking modes and exciton behaviors,which provides new insights and perspectives for optimizing exciton character and behavior through the modulation of molecular arrangement in aggregate states,thereby enhancing the performance of optoelectronic materials.
文摘Good film formation is one of basic requirements for organic optoelectronic materials to achieve the capability for fabrication of large area devices. Small molecular optoelectronic compounds have a definite chemical structure and clear device performance, and thus are welcomed in the field. However, they are generally suffering from poor film formation, especially in a large area. For addressing it, this contribution proposes and demonstrates a strategy, that is, changing them into poly（rod-coil） polymers. With one optoelectronic compound [BDT（DTBT）2] and three poly（rod-coil） polymers （P1, P2, and P3） having different non-conjugated coil segments as examples, the work clearly shows that the change to poly（rod-coil） polymers keeps many basic optoelectronic properties of the refer- ence compound, including light absorption in solution, bandgap and frontier orbital energy levels, but suppresses strong intermolecular interactions and crystalline structure in film state. Further comparisons on film formation quality on glass and ITO glass illustrate that all the three polymers have a better film formation property than the reference compound.
基金This work was supported by the National Natural Science Foundation of China （Nos. 21373097 and 51072067）.
文摘Metal-halide perovskites are novel optoelectronic materials that are considered good candidates for solar harvesting and light emitting applications. In this study, we develop a reproducible and low-cost approach for synthesizing high- quality cesium lead halide perovskite （CsPbX3, X = CI, Br, and I or C1/Br and I/Br） nanocrystals （NCs） by direct heating of precursors in octadecene in air. Experimental results show that the particle size and composition of as-prepared CsPbX3 nanocrystals can be successfully tuned by a simple variation of reaction temperature. The emission peak positions of the as-prepared nanocrystals can be conveniently tuned from the UV to the NIR （360-700 nm） region, and the quantum yield of the as-obtained samples （green and red emissions） can reach up to 87%. The structures and chemical compositions of the as-obtained NCs were characterized by transmission electron microscopy, X-ray diffraction, and elemental analysis. This proposed synthetic route can yield large amounts of high-quality NCs with a one-batch reaction, usually on the gram scale, and could pave the way for further applications of perovskite-based light-emitting and photovoltaic solar cells.
基金This work was supported by the NSF of China(21822109,21805276,21773245,21773151,21975254)National Key R&D Program of China(2017YFA0206802)+2 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(XDB20000000)Key Research Program of Frontier Science,Chinese Academy of Sciences(QYZDB-SSW-SLH023)Youth Innovation Promotion Association CAS,International Partnership Program of CAS(121835KYSB201800).
文摘Conductive coordination polymers(CCPs)have shown great potential for electronic purposes.However,their applications in photodetection have been limited by poor sensitivity,low on/off current ratio,and slow response owing to the low charge generation and/or separation efficiency.In this work,metal-to-ligand chargetransfer(MLCT)in PhSeAg was used to fabricate a single-component MLCT photodetecting material for the first time to solve the above challenges.The material obtained possesses ultrahigh sensitivity to weak-light intensity(0.03 mW cm^(−2)),the highest on/off ratio,and the fastest response speed than other wellknown CCPs materials tested.Our work might provide a simple but common strategy for designing high-performance CCPs composites for optoelectrical applications.
