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Science China Chemistry 2015年第4期58卷 658-665页

作者： Dongdong Wang Hua Dong Xiaoyu Zhang Yong wu Shaohua Shen Bo Jiao zhaoxin wu Min Gao Geng Wang Department of Applied Chemistry School of Science Xi’an Jiaotong University Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic and information Engineering Xi’An Jiaotong University Key Laboratory for Advanced Materials Institute of Fine Chemicals and Department of Chemistry East China University of Science and Technology International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

Iridium complexes with dicyanovinyl-grafted phenylpyridine/l-phenylisoquinoline as ligands are synthesized and their photo- physical, electrochemical, and sensitization properties in DSSCs are investigated. The iridium complexes present significantly enhanced absorption from 400 to 525 nm. The 1-phenylisoquinoline-based iridium complex show bathochromic-shift emission in DMSO solution compared with their phenylpyridine-based counterpart, while their absorption response and photoluminescence peak in solid show little difference despite extension of the conjugated system. Using DSSCs, the conversion efficiency of 0.62% and open-circuit current of 1.4 mA/cm2 is achieved. The poor performance is attributed to the excited-state properties of iridium complexes according to the TD-DFT calculation.

关键词： dicyanovinyl group iridium complexes absorption response dye-sensitized solar cell

Dependence of the stability of organic light-emitting diodes on driving mode

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Chinese Science Bulletin 2011年第21期56卷 2210-2214页

作者： ZHANG WenWen wu zhaoxin ZHANG XinWen LIANG ShiXiong JIAO Bo HOU Xun State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Photonics Technology for Information of Shaanxi Province School of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China

We investigated the effects of pulsed current (PC) and direct current (DC) driving modes on the stability of organic light-emitting diodes with and without hole-injection layers (HILs).Two different HIL materials were used:copper phthalocyanine (CuPc) and 4,4',4″-tris(3-methylphenylphenylamino)triphenylamine (m-MDTATA).It was found that the half-lives of devices using PC driving modes were different from those of comparable devices using DC driving *** the devices without HILs,with CuPc HILs and with MTDATA HILs,the half-lives of the devices were changed by factors of 1.91,1.41 and 0.86,respectively,when operated in PC rather than DC driving *** analysis of the electrical characteristics of the corresponding hole-only devices showed that the number of holes injected into devices was greatly reduced by inserting an m-MTDATA layer compared with other *** results indicate that different ratios of injected electrons and holes can be obtained in these ***,these ratios play a dominant role in the dependence of the stability of the device on the driving mode.

关键词：有机发光二极管驾驶模式稳定 ILS设备驱动模式脉冲电流 CuPc 电气特性

Silafluorene moieties as promising building blocks for constructing wide-energy-gap host materials of blue phosphorescent organic light-emitting devices

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Science China Chemistry 2015年第6期58卷 993-998页

作者： Dongdong Wang Qingqing Liu Yue Yu Yong wu Xinwen Zhang Hua Dong Lin Ma Guijiang Zhou Bo Jiao zhaoxin wu Runfeng Chen Department of Applied Chemistry School of Science Xi'an Jiaotong University Key Laboratory of Organic Electronics and Information Displays Institute of Advanced Materials School of Electronic and Information Engineering Nanjing University of Posts and Telecommunications Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic and Information Engineering Xi'an Jiaotong University

In this article, we reported the synthesis and characterization of a novel silafluorene-based host material, 1,3-bis（5-methyl-5H- dibenzo[b,d]silol-5-yl）benzene （Me-DBSiB）, for blue phosphorescent organic light-emitting devices （PHOLEDs）. The Me- DBSiB was constructed by linking 9-methyl-9-silafluorene units to the phenyl framework through the sp3-hybridized silica atom to maintain high singlet and triplet energy, as well as to enhance thermal and photo-stability. The calculated result shows that the phenyl core does not contribute to both the highest occupied molecular orbital and lowest unoccupied molecular orbital. Wide optical energy gap of 4.1 eV was achieved. When the Me-DBSiB was used as the host and iridium （Ⅲ） bis[（4,6-difluorophenyl）pyridinato-N,C2＇]picolate （Firpic） as the guest, a maximum current efficiency was 14.8 cd/A, lower than the counterpart of 1,3-bis（9-carbazolyl）benzene （28 cd/A）. The unbalanced barrier for electron and hole injection to host layer may be responsible for low efficiency. Even so, our results show that silafluorene moieties are promising building blocks for constructing wide-energy-gap host materials.

关键词： silafluorene moiety wide energy gap host materials blue phosphorescence organic light-emitting device

Perovskite solar cell towards lower toxicity: a theoretical study of physical lead reduction strategy

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Science Bulletin 2019年第17期64卷 1255-1261页

作者： Yifan Zheng Rui Su Zhaojian Xu Deying Luo Hua Dong Bo Jiao zhaoxin wu Qihuang Gong Rui Zhu State Key Laboratory for Mesoscopic Physics School of Physics Nano-optoelectronics Frontier Center of Ministry of Education (NFC-MOE)& Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China Key Laboratory of Photonics Technology for Information Key Laboratory for Physical Electronics and Devices of the Ministry o f Education Department o f Electronic Science and Technology School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China

The huge performance enhancements of the organometal halide perovskite solar cells(OHPSCs) have appealed enormous attention within recent ten years. Although the rapid growth of the device power conversion efficiency(PCE) has attained over 25%, the contamination of health-hazardous components still holds back its sustainable applications. To reduce the lead usage, many groups have tried chemical lead reduction solutions: substituting the lead by other group 14 metal elements to realize the low-lead OHPSCs. Unfortunately, neither the PCE nor the stability, low-lead OHPSCs all lag far behind the state-ofthe-art conventional lead-based OHPSCs. In this work, we present a physical lead reduction(PLR) concept by reducing the perovskite film thickness to restrict the perovskite hazard risk with minor scarification in device performances. Through the simulation of transfer matrix model, we theoretically demonstrated that by introducing the optical space layer, the device PCE could maintain 96% of the original maximum value while attenuating the perovskite film thickness to one-third. This means that the usage of lead can be reduced by $70% with PLR concept, which could have broad appeal as a new lead reduction strategy towards high performance OHPSCs.

关键词： Perovskite solar cell Physical lead reduction Low toxicity Optical space layer Transfer matrix model

Ligand Engineering in Tin-Based Perovskite Solar Cells

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Nano-Micro Letters 2023年第10期15卷 112-150页

作者： Peizhou Li Xiangrong Cao Jingrui Li Bo Jiao Xun Hou Feng Hao Zhijun Ning Zuqiang Bian Jun Xi Liming Ding zhaoxin wu Hua Dong Key Laboratory for Physical Electronics and Devices(MoE) Shaanxi Key Lab of Information Photonic TechniqueSchool of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731People’s Republic of China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210People’s Republic of China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China

Perovskite solar cells(PSCs)have attracted aggressive attention in the photovoltaic field in light of the rapid increasing power conversion ***,their large-scale application and commercialization are limited by the toxicity issue of lead(Pb).Among all the lead-free perovskites,tin(Sn)-based perovskites have shown potential due to their low toxicity,ideal bandgap structure,high carrier mobility,and long hot carrier *** progress of Sn-based PSCs has been realized in recent years,and the certified efficiency has now reached over 14%.Nevertheless,this record still falls far behind the theoretical *** is likely due to the uncontrolled nucleation states and pronounced Sn(Ⅳ)*** insights into the methodologies resolving both issues,ligand engineering-assisted perovskite film fabrication dictates the state-of-the-art Sn-based ***,we summarize the role of ligand engineering during each state of film fabrication,ranging from the starting precursors to the ending fabricated *** incorporation of ligands to suppress Sn~(2+)oxidation,passivate bulk defects,optimize crystal orientation,and improve stability is discussed,***,the remained challenges and perspectives toward advancing the performance of Sn-based PSCs are *** expect this review can draw a clear roadmap to facilitate Sn-based PSCs via ligand engineering.

关键词： Perovskite Solar cells Lead-free Ligand engineering Defects Stability

Chlorine-Substituent Regulation in Dopant-Free Small-Molecule Hole-Transport Materials Improves the Effi ciency and Stability of Inverted Perovskite Solar Cells

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Transactions of Tianjin University 2024年第4期30卷 314-323页

作者： Xinyi Liu Xiaoye Zhang Zhanfeng Li Jinbo Chen Yanting Tian Baoyou Liu Changfeng Si Gang Yue Hua Dong zhaoxin wu Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China School of Electrical Engineering University of South ChinaHengyang 421001China College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024China Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center Ningxia Sinostar Display Material Co.Ltd.Yinchuan 750003China Organic Semiconductor Centre EaStCHEM School of ChemistryUniversity of St AndrewsFife KY169STUK Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

Although doped hole-transport materials(HTMs)off er an effi ciency benefi t for perovskite solar cells(PSCs),they inevi-tably diminish the ***,we describe the use of various chlorinated small molecules,specifi cally fl uorenone-triphenylamine(FO-TPA)-x-Cl[x=para,meta,and ortho(p,m,and o)],with diff erent chlorine-substituent positions,as dopant-free HTMs for *** chlorinated molecules feature a symmetrical donor-acceptor-donor structure and ideal intramolecular charge transfer properties,allowing for self-doping and the establishment of built-in potentials for improving charge *** effi cient hole-transfer interfaces are constructed between perovskites and these HTMs by strategi-cally modifying the chlorine ***,the chlorinated HTM-derived inverted PSCs exhibited superior effi ciencies and air ***,the dopant-free HTM FO-TPA-o-Cl not only attains a power conversion effi ciency of 20.82% but also demonstrates exceptional stability,retaining 93.8%of its initial effi ciency even after a 30-day aging test conducted under ambient air conditions in PSCs without *** fi ndings underscore the critical role of chlorine-substituent regulation in HTMs in ensuring the formation and maintenance of effi cient and stable PSCs.

关键词： Hole-transport materials Inverted perovskite solar cells Chlorinated small molecules Donor–acceptor–donor structure

White organic light-emitting devices fabricated by spin-coating molecular materials

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Chinese Science Bulletin 2010年第24期55卷 986-991页

作者： WANG DongDong wu zhaoxin ZHANG XinWen JIAO Bo WANG DaWei HOU Xun School of Science Xi' an Jiaotong University Xi'an 710049 China Key Laboratory for Physical Electronics and Devices of the Ministry of Education Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering Xi' an Jiaotong University Xi 'an 710049 China

White organic light-emitting device (WOLEDs) employing molecular mixed host (MH) is demonstrated by *** spin-coated film functions as light-emitting layer and hole transporting layer,with the former formed by spin-coating solution containing MH of NPB (N.N'-Bis(naphthalene-1-yl)-N,N'-bis(phenyl)-benzidine) and MADN (2-methyl-9,10-di(2-naphthyl) anthracene),blue dye (4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl) and yellow dye (5,6,11,12-tetraphenylnaphacene).The performances of the devices made with different mixed ratio of MH are *** is found that the device performances depends on the MH ratio,and under the optimal NPB:MADN ratio (60:40),the WOLEDs show a maximum luminance of 24 671 cd/m2 and a current efficiency of 5.8 cd/A for the practical luminance of 1000 cd/*** effect of MH ratio on device performances can be attributed to the difference of hole mobility between the NPB and MADN.

关键词：白色有机发光器件高分子材料制备设备旋涂混合比例装置性能空穴传输层 NPB

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相干态和压缩态光场与二能级原子相互作用的演化特性

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光子学报 2000年第9期29卷 773-779页

作者：吴朝新顾樵侯洵西北大学光子学与光子技术研究所西安710069 德国国际生物物理研究所中国科学院西安光学精密机械研究所西安710068

本文着重讨论了在相干态、压缩态光场与二能级原子的相互作用中某些物理量的演化特性 .

关键词：相干态压缩态光场二能级原子 JCM 演化特性

Round-trip imaging through scattering media based on optical transmission matrix

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Chinese Optics Letters 2018年第4期16卷 66-69页

作者： Bin Zhuang Chengfang Xu Yi Geng Guangzhi Zhao Hui Chen Zhengquan He zhaoxin wu Liyong Ren Research Department of Information Photonics Xi＇an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi＇an 710119 China University of Chinese Academy of Sciences Beijing 100049 China of Electronics Science and Technolog School of Electronic ＆ Information Engineering Xi＇an Jiaotong University Xi＇an 710049 China

Traditional one-way imaging methods become invalid when a target object is completely hidden behind scattering media. In this case, it has been much more challenging, since the light wave is distorted *** solve this problem, we propose an imaging method, so-called round-trip imaging, based on the optical transmission matrix of the scattering medium. We show that the object can be recovered directly from the distorted output wave, where no scanning is required during the imaging process. We predict that this method might improve the imaging speed and have potential application for real-time imaging.

关键词： Round-trip imaging through scattering media based on optical transmission matrix

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锡基钙钛矿太阳能电池研究进展

物理化学学报 2021年第4期37卷 27-43页

作者：李淏淼董化李璟睿吴朝新西安交通大学电子科学与工程学院电子物理与器件教育部重点实验室陕西省信息光子技术重点实验室西安710049 山西大学极端光学协同创新中心太原030006 西安交通大学电子科学与工程学院电子陶瓷与器件教育部重点实验室国际电介质研究中心西安710049

自2009年以来,有机-无机卤化物钙钛矿因其独特的光学和电学性能,在光电材料领域受到了广泛的研究,尤其是Pb基的卤化物钙钛矿太阳能电池,目前光电转换效率高达创纪录的约25.2%,显示出强大的商业化潜力。然而,Pb元素的毒性及因而导致的环... 详细信息

自2009年以来,有机-无机卤化物钙钛矿因其独特的光学和电学性能,在光电材料领域受到了广泛的研究,尤其是Pb基的卤化物钙钛矿太阳能电池,目前光电转换效率高达创纪录的约25.2%,显示出强大的商业化潜力。然而,Pb元素的毒性及因而导致的环境隐患问题,一直是其产业化过程中的顾虑之一。因此,寻求能替代Pb的环境友好的元素,是一个十分重要的课题。Pb基钙钛矿材料优异的光电特性来源于Pb^(2+)的最外层6s2孤对电子,与Pb元素同主族的Sn元素能够形成三维钙钛矿结构且同样具有惰性5s2外层电子结构,因而是替代Pb的首选。本文系统地介绍了Sn基钙钛矿的光学和电学性质,并从薄膜制备方法和不同的器件结构方面介绍Sn基钙钛矿太阳能电池的最新进展。

关键词： Sn基有机/无机钙钛矿太阳能电池成膜方法器件结构