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Design and performance tuning of luminescent materials for Micro LED

Design and performance tuning of luminescent materials for M...

China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Yuhua Wang Xicheng Wang Deyin Wang Tianrong Li Takatoshi Seto School of Materials and Energy Lanzhou University Lanzhou China National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou University Lanzhou China

Micro-LED is regarded as the next generation of display technology, and luminescence materials are one of the key materials to achieve full color, but there are still great challenges to developing efficient quantum dots and stable small-sized phosphors. In view of the key problems in quantum dots, such as poor stability, low quantum efficiency, and difficulty in balancing the small size and brightness of phosphor materials, this report will introduce the research progress in the realization of controllable material preparation and performance regulation.

关键词： Toxicology Quantum dots Phosphors Brightness Luminescence Doping Perovskites

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Water-stable Mn-based MOF nanosheet as robust visible-light-responsive photocatalyst in aqueous solution

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Science China Chemistry 2020年第12期63卷 1756-1760页

作者： Yejun Xiao Xiangyang Guo Tongtong Yang Junxue Liu Xuan Liu Yu Xiao Lifang Liu Taifeng Liu Sheng Ye Jun Jiang Fuxiang Zhang Can Li State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energythe Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Molecular Reaction Dynamics the Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalin 116023China University of Chinese Academy of Sciences Beijing 100049China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Collaborative Innovation Center of Nano Functional Materials and Applications of Henan ProvinceHenan UniversityKaifeng 475000China

Development of visible-light-responsive metal-organic frameworks(MOFs) for promising solar energy conversion has inspired continuous interest, but it still suffers from poor stability especially in aqueous solution and/or under photoirradiation due to their relatively labile coordination bonds. Herein, a new synthesized layered Mn-based MOF(Mn-TBAPy-BK) and its exfoliated twodemensional nanosheets(Mn-TBAPy-NS) are revealed to be highly stable no matter in aqueous solution with wide p H region or under visible light irradiation. As expected, the exfoliated Mn-TBAPy-NS exhibits enhanced surface area, shortened charge transfer distance, and superior charge separation with respect to the bulk one. Moreover, the as-obtained nanosheets can be employed as effective building block for nanocomposite and heterostructure assembly to further promote charge separation as well as solar hydrogen production from aqueous solution under visible light. The finding of water stable MOF nanosheet under visible light demonstrates its promising future for solar energy conversion.

关键词： metal-organic framework nanosheet water stable photocatalyst nanocomposite

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In Situ Passivation and Thiol-Mediated Anchoring of Perovskite Quantum Dots in Mesoporous Covalent-Organic Frameworks

SSRN

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SSRN 2022年

作者： Ren, Jiejun Zhou, Xiaopeng Wang, Yuhua School of Materials and Energy National and Local Joint Engineering Laboratory for Optical Conversion Materials Lanzhou University Tianshui South Road Lanzhou222 China

Metal halide perovskite quantum dots (PQDs) are considered as promising candidate for the next generation optoelectronic applications. However, their development is severely restricted by their poor stability. Here, we demonstrate the in situ growth of PQDs in the ordered channels of functionalized covalent-organic frameworks (COFs). The strong S-Pb chemical binding firmly anchors the PQDs in COF matrix, which prevent the aggregation of PQDs and eliminate the nonradiative trap centers of PQDs, leading to the high photoluminescence quantum yield (81.5 %) and remarkable stability. Femtosecond transient absorption spectroscopy reveal the elimination of nonradiative trap centers in PQD@COFs. Theoretical simulation results demonstrate the strong waveguide effect in PQD@COFs, which reduces the reabsorption loss. Further, the obtained white light-emitting diode exhibits ultrahigh luminous efficiency of 89.6 lm/W and excellent operating stability, which paves the way for the commercial application of PQDs. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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Na2FePO4F/C composite synthesized via a simple solid state route for lithium-ion batteries

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Journal of Central South University 2019年第6期26卷 1521-1529页

作者： HU Hai WANG Yu HUANG Yan SHU Hong-bo WANG Xian-you School of Mechanical Engineering and School of Chemistry Xiangtan UniversityXiangtan 411105China National Base for International Science & Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionXiangtan 411105China

Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction *** XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indicating high crystalline and phase *** SEM and TEM images reveal that diameter of the spherical-like Na2FePO4F/C particles ranges from 50 to 300 nm,and HRTEM image shows that the surface of Na2FePO4F/C composite is uniformly coated by carbon layer with a average thickness of about 3.6 *** carbon coating constrains the growth of the particles and effectively reduces the agglomeration of *** lithium metal as anode,the composite delivers a discharge capacities of 102.8,96.4 and 90.3 mA·h/g at rates of 0.5C,1C and 2C,*** 100 cycles at 0.5C,a discharge capacity of 98.9 mA·h/g is maintained with capacity retention of 96.2%.The Li+diffusion coefficient(D)of Na2FePO4F/C composite is calculated as 1.71×10^–9 cm^2/*** study reveals that the simple solid state reaction could be a practical and effective synthetic route for the industrial production of Na2FePO4F/C material.

关键词： lithium-ion batteries Na2FePO4F/C composite alcohol-assisted ball milling solid state reaction spherical-like particles

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Band offsets and electronic properties of the Ga_(2)O_(3)/FTO heterojunction via transfer of free-standing Ga_(2)O_(3) onto FTO/glass

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Chinese Physics B 2021年第11期30卷 385-388页

作者： Xia Wang Wei-Fang Gu Yong-Feng Qiao Zhi-Yong Feng Yue-Hua An Shao-Hui Zhang Zeng Liu Department of Electrical Engineering and Automation Shanxi Institute of TechnologyYangquan 045000China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

The determination of band offsets is crucial in the optimization of Ga_(2)O_(3)-based devices,since the band alignment types could determine the operations of devices due to the restriction of carrier transport across the heterogeneous *** this work,the band offsets of the Ga_(2)O_(3)/FTO heterojunction are studied using x-ray photoelectron spectroscopy(XPS)based on Kraut’s method,which suggests a staggered type-II alignment with a conduction band offset(DEC)of 1.66 eV and a valence band offset(DEV)of􀀀2.41 ***,the electronic properties of the Ga_(2)O_(3)/FTO heterostructure are also measured,both in the dark and under ultraviolet(UV)illuminated conditions(254 nm UV light).Overall,this work can provide meaningful guidance for the design and construction of oxide hetero-structured devices based on wide-bandgap semiconducting Ga_(2)O_(3).

关键词： Ga_(2)O_(3)/FTO heterojunction band alignment magnetron sputtering free-standing

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From liquid metal to stretchable electronics:Overcoming the surface tension

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Science China materials 2022年第8期65卷 2072-2088页

作者： Zixu Yang Dan Yang Xizheng Zhao Qinyi Zhao Ming Zhu Yan Liu Yu Wang Weihong Lu Dianpeng Qi MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China National and Local Joint Engineering Laboratory for Synthesis Transformation and Separation of Extreme Environmental NutrientsHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 450001China

The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or *** these products need to work during deformation,their requirements for materials focus on stretchability and *** metals are excellent materials with these ***,liquid metals have extremely high surface tension at room temperature,which will spontaneously form a spherical shape and are difficult to form the shape required by stretchable devices,which is the biggest obstacle to their development in this emerging ***,the emphasis is placed on the principle of overcoming the high surface tension in this review,and various methods of using liquid metals to fabricate stretchable electronic devices based on these principles have been *** metals show promise in the convenience of sensing,energy harvesting,*** existing challenges and opportunities are also discussed here.

关键词： liquid metals EGaIn Galinstan stretchable electronics surface tension

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多孔氮掺杂FeP/C纳米纤维作为钾离子电池负极

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Journal of Central South University 2023年第10期30卷 3248-3259页

作者：张文刘烨叶仲强阳敏罗琪戴晶王乾富刘黎 National Base for International Science&Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionKey Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China

由于自然界中钾储量巨大且K+/K电位低,钾离子电池(PIBs)被认为是锂离子电池的替代品之一。因此,在这项工作中,我们合成了多孔氮掺杂FeP/C纳米纤维(P-FeP/C-N NFs),一种用于PIB的新型电极材料。通过简单的静电纺丝和随后的煅烧处理,将聚... 详细信息

由于自然界中钾储量巨大且K+/K电位低,钾离子电池(PIBs)被认为是锂离子电池的替代品之一。因此,在这项工作中,我们合成了多孔氮掺杂FeP/C纳米纤维(P-FeP/C-N NFs),一种用于PIB的新型电极材料。通过简单的静电纺丝和随后的煅烧处理,将聚丙烯腈(PAN)和聚甲基丙烯酸甲酯(PMMA)分别用作氮源和造孔剂,引入氮提高了材料的导电性,多孔结构的形成增加了比表面积。将P-FeP/CN NFs用作钾离子电池的电极,表现出优异的电化学性能。P-FeP/C-N NFs电极在100 mA/g循环250次后放电容量为274.2 mA·h/g,在1000 mA/g循环300次后放电容量为171.3 mA·h/g。即使在5000 mA/g下,也显示出150.1 mA·h/g的高放电容量。结果表明P-FeP/C-N NFs有望成为钾离子电池负极材料的候选材料。

关键词：静电纺丝 FeP 氮掺杂多孔纳米纤维钾离子电池

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Broadband photomultiplication-type polymer photodetectors and its application in light-controlled circuit

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Science China Chemistry 2022年第8期65卷 1642-1649页

作者： Ming Liu Qunping Fan Kaixuan Yang Zijin Zhao Xingchao Zhao Zhengji Zhou Jian Zhang Francis Lin Alex K.-Y.Jen Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Chemistry City University of Hong KongHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand School of MaterialsHenan UniversityKaifeng 475004China Guangxi Key Laboratory of Information Materials School of Material Science and TechnologyGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering University of WashingtonWashington 98195-2120United States Hong Kong Institute for Clean Energy City University of Hong KongHong Kong 999077China

Photomultiplication-type polymer photodetectors(PM-PPDs)were achieved with polymer P3HT as donor and PY3Se-1V as acceptor based on structure of ITO/PEDOT:PSS/active layer/*** optimal weight ratio of P3HT to PY3Se-1V is about 100:*** of isolated electron traps are formed with PY3Se-1V surrounded by P3HT due to rather less content of PY3Se-1V in active layers and about 0.94 e V energy offset between the lowest unoccupied molecular orbitals(LUMO)of P3HT and *** optimal PM-PPDs exhibit broad spectral response from 350 to 950 nm and external quantum efficiency(EQE)values of68,200%at 360 nm,26,400%at 630 nm and 19,500%at 850 nm under-15 V *** working mechanism of PM-PPDs is attributed to the interfacial trap-assisted hole tunneling injection from external *** performance of PM-PPDs can be further improved by incorporating appropriate PMBBDT with high hole mobility as the third *** EQE values of optimal ternary PM-PPDs are increased to 105,000%at 360 nm,40,000%at 630 nm and 31,800%at 850 nm under-15 V bias,benefiting from the enhanced hole transport in ternary active *** optimal ternary PM-PPDs were successfully applied in a light-controlled circuit to turn on or turn off light emitting diode(LED).

关键词： polymer photodetectors photomultiplication external quantum efficiency broadband

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Unraveling the efficiency losses and improving methods in quantum dot-based infrared up-conversion photodetectors

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Opto-Electronic Science 2024年第4期3卷 1-11页

作者： Jiao Jiao Liu Xinxin Yang Qiulei Xu Ruiguang Chang Zhenghui Wu Huaibin Shen Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of MaterialsHenan UniversityKaifeng 475004China

Quantum dot-based up-conversion photodetector,in which an infrared photodiode(PD)and a quantum dot light-emitting diode(QLED)are back-to-back connected,is a promising candidate for low-cost infrared ***,the huge efficiency losses caused by integrating the PD and QLED together hasn’t been studied *** work revealed at least three origins for the efficiency ***,the PD unit and QLED unit usually didn’t work under optimal conditions at the same ***,the potential barriers and traps at the interconnection between PD and QLED units induced unfavorable carrier ***,much emitted visible light was lost due to the strong visible absorption in the PD *** on the understandings on the loss mechanisms,the infrared up-conversion photodetectors were optimized and achieved a breakthrough photon-to-photon conversion efficiency of 6.9%.This study provided valuable guidance on how to optimize the way of integration for up-conversion photodetectors.

关键词： infrared colloidal quantum dots up-conversion photodetector integration loss interconnection voltage allocation

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Design and Preparation of High Color Rendering Red Inorganic Pigment Via Red Light Emission Phosphor

SSRN

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SSRN 2023年

作者： Wang, Qiangbin Du, Yuze Seto, Takatoshi Wang, Yuhua Liu, Wenjing National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology National Development and Reform Commission Department of Materials Science School of Materials and Energy Lanzhou University No. 222 South Tianshui Road Gansu Lanzhou730000 China

In this paper, a new method to improve the color rendering performance of inorganic red pigment by adding phosphor is proposed. The optimal mixing ratios of (Ca,Sr)AlSiN3:Eu2+, (Sr,Ba)2Si5N8:Eu2+ and NaMgPO4:Eu2+ phosphors in the γ-Ce2S3 red material are 20%, 10% and 5%, respectively. At the optimal mixing ratios;L* increased by 12.9%, 3.5% and 3%, separately;a* increased by 4.3%, 4% and 1.6% severally;C* increased by 7.9%, 4.3% and 1.5% in turn. Of course, the different properties of the phosphors themselves make the mixing ratios different. Subsequently, the mechanism of pigment fluorescent materials is further investigated by using Chromatometer, SEM, Fluorescence Photometer, UV-vis Spectrophotometer and Fluorescence Microscope. The results shows that, under the irradiation of sunlight, the fluorescent materials in the fluorescent pigments are excited by the light of specific wavelengths in the sunlight, producing an asymmetric broad-band emission in the visible red region. The light emitted as a second light source is diffusely reflected by the pigment particles, which plays a superimposed effect and finally improves the color rendering ability of the red γ-Ce2S3 pigment that originally relies only on the reflected sunlight energy. © 2023, The Authors. All rights reserved.

关键词： Phosphors

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