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Heat revolution on photophysical properties and electroluminescent performance of Ir(ppy)_3-doped bipolar host of oxadiazole derivatives attaching with inert group of tert-butyl moiety

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science China Chemistry 2014年第6期57卷 849-856页

作者： WANG HongJiao LIU Chen MI BaoXiu SANG Jie LI Xin GAO ZhiQiang jiangsu engineering centre for flat-panel displays & solid-state lighting College of Materials Science & EngineeringNanjing University of Posts & Telecommunications Key Laboratory for Organic Electronics & Information displays (KLOEID) Institute of Advanced Materials (IAM)Nanjing University ofPosts & Telecommunications

Two bipolar materials,2,5-bis(2-(9H-carbazole-9-yl)phenyl)-1,3,4-oxadiazole(o-CzOXD)and 2,5-bis(2-(3',6'-di-tert-butyl-9H-carbazole-9-yl)phenyl)-1,3,4-oxadiazole(tBu-o-CzOXD),were synthesized according to reported *** parallel study,it was demonstrated that introduction of inert tert-butyl group improved material thermal stability,even though this modification only had a slight influence to the photophysical and electrochemical properties of these materials.A comparative study focusing on effects of heat treatment was carried out on the quartz glass substrates with vacuum deposited films containing one of the bipolar host doped with 6 wt%fac-tris(2-phenylpyridinato-N,C2’)iridium(Ir(ppy)3).Results show that when the two samples were heated,the absorption,emission,and photo images of the host:dopant system changed,with the o-CzOXD suffering more severe degradation under high temperature,which is consistent with their thermal *** addition,it was proved that the high temperature-annealed host:dopant system can enhance the emission of the *** finding was used as a guideline to improve our device *** fabricated two types of phosphorescent organic light-emitting devices(PhOLEDs),one was based on o-CzOXD,the other was based on *** had analogous *** investigated the effect of heat on device performance by selectively *** these two freshly prepared devices exhibited similar performance,when annealed at 90°C for 10 min,the OLEDs based on tBu-o-CzOXD showed significant performance enhancement,which can be attributed to the observation that annealing Ir(ppy)3 doped host can change film morphology and enhance the dopant *** maximum efficiencies of the freshly prepared tBu-o-CzOXD device were 25.8 cd A-1,23.1lm W-1,and 9.3%;whereas those for annealed device were 47.0 cd A-1,42.2 lm W-1,and 13.4%.

关键词： OLED bipolar host emitting layer thermal stability inert group tert-butyl moiety

Convenient and inexpensive determination of optical constants and film thickness of blended organic thin film

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science China(Physics,Mechanics & Astronomy) 2015年第2期58卷 26-32页

作者： LIANG QiYing CHEN Jie LI Xin GAO ZhiQiang MI BaoXiu YANG ZhenHua jiangsu engineering centre for flat-panel displays & solid-state lighting and College of materials science & engineering Nanjing University of Posts & Telecommunications Key Laboratories for Organic Electronics & Information displays (KLOEID) and Institute of Advanced materials (IAM) Nanjing University of Posts & Telecommunications College of science Nanjing University of Posts & Telecommunications

This work presents the study of optical constants and film thickness of blended organic thin films, emphasizing on the modeling procedure with modified genetic algorithm aided by absorption or transmittance spectra of both pure materials and the blends. Taking the blending of copper phthalocyanine(Cu Pc) and fullerene(C60) as an example, a simple, convenient and low-cost method for the determination of the optical constants and film thickness of blended organic thin films was demonstrated. New scheme for optical modeling of blended organic thin film was proposed by introducing peak energies of Cody-Lorentz oscillators of the pure materials, which were determined by fitting the film absorption of pure materials. These oscillators of pure materials could be recognized in the transmittance spectrum of their blends, and were further used as the initial searching ranges in the simulation of blended films. As a result, the constraint bounds of the unknown parameters were significantly reduced and modeling efficiency as well as fitting accuracy was improved. For instance, the fitting of the transmittance curves of blended films with different blending ratios reached reliable results in comparison with extinction coefficients obtained from experiment.

关键词： organic photovoltaic optical modelling blended thin film CuPc: C60 optical constant

Organic thin-film solar cells:Devices and materials

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science China Chemistry 2012年第4期55卷 553-578页

作者： LI ZhiGang1, ZHAO XinYan2, LI Xin1,2, GAO ZhiQiang1, MI BaoXiu1 & HUANG Wei2 1jiangsu engineering centre for flat-panel displays & solid-state lighting and school of materials science & engineering, Nanjing University of Posts & Telecommunications, Nanjing 210046, China 2Key Laboratory for Organic Electronics & Information displays (KLOEID) Institute of Advanced materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing 210046, China jiangsu engineering centre for flat-panel displays & solid-state lighting and school of materials science & engineering Nanjing University of Posts & Telecommunications Nanjing China Key Laboratory for Organic Electronics & Information displays (KLOEID) Institute of Advanced materials (IAM) Nanjing University of Posts & Telecommunications Nanjing China

In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The r/p of 7.4% was achieved in the year 2010, and r/p of 9.2% was disclosed and confirmed at website of Mitsubishi Chemical in April, 2011. The promising future is that the r/p of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thinfilm solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture.

关键词： organic – solar cell – photovoltaic – devices – materials

Recent progress in the numerical modeling for organic thin film solar cells

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science China(Physics,Mechanics & Astronomy) 2011年第3期54卷 375-387页

作者： ZHAO XinYan MI BaoXiu GAO ZhiQiang HUANG Wei Key Laboratory for Organic Electronics & Information displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications Nanjing 210046 China jiangsu engineering centre for flat-panel displays & solid-state lighting School of Materials Science & Engineering Nanjing University of Posts & Telecommunications Nanjing 210046 China

Device modeling is constructive in finding the dependency of devices efficiency on structure parameters and material properties. For the sake of looking into the physics mechanism of organic solar cells (OSCs), as well as predicting their maximum attainable efficiency, numerical modeling is widely utilized to simulate the behavior of OSCs. Although some indispensable parameters are neglected or hypothesized because of inexplicitness in simulation models for OSCs, numerical modeling can describe the kinetic process in OSCs intuitively. This paper summarizes the optical/electrical models in the BHJ solar cell, as well as addresses their corresponding development in recent years on the basis of device physics and its working principle. Applications of numerical modeling and comments on modeling results are summarized. Meanwhile, precision and open questions about every model are discussed.

关键词： organic solar cell numerical modeling optical model electrical model

Pure aromatic hydrocarbons with meta-linked phenyl-core and perihedral fluorene substitutions with/without inert groups of tert-butyl： bipolar hosts for blue phosphorescence

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science China Chemistry 2017年第2期60卷 223-230页

作者： Gaowen Liu Chuanjun Wang Baoxiu Mi Minjie Zhuo Changjin Ou Jie Wang Shuchao Zheng Juan Song Zhiqiang Gao Dapeng Cao Key Laboratory for Organic Electronics and Information displays & Institute of Advanced materials (IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts & Telecommunications Nanjing 210023 China. school of Material science and engineering Jiangsu Engineering Centre for Flat-Panel Displays & Solid-state Lighting Nanjing University of Posts &Telecommunications Nanjing 210023 China

Two pure hydrocarbon molecules of l,3,5-tris(9-phenyl-9H-fluoren-9-yl)benzene(mTPFB)and l,3,5-tris(2-tert-butyl-9-phenyl-9H-fluoren-9-yl)benzene(tBu-mTPFB)were *** to the conjugation blocked connection mode and rigid/bulky substitutions,these two materials possess high triplet energy,enabling them as good hosts for blue phosphor in *** studying their thermal,electrochemical,electronic absorption and photoluminescent properties,it was found that the influence of the inert tert-butyl group on material photoelectrical properties is *** instance,mTPFB and tBu-mTPFB showed very similar absorption and emission profiles,with almost the same bandgap,triplet energy and energy ***,the encapsulation of tert-butyl on the 2-position of 9-phenylfluorene enhanced material thermal *** importantly,carrier transport properties were improved dramatically,as proved by the mono carrier *** phosphorescent OLEDs hosted by tBu-mTPFB showed external quantum efficiency of 15.2%and current efficiency of 23.0 cd/A,which were much higher than that of the OLEDs based on mTPFB with the analogous structure.

关键词： pure aromatic hydrocarbon bipolar host thermal stability carrier transport properties tert-butyl moiety

A thermal stable cathode buffer based on an inexpensive tetranuclear zinc(Ⅱ) complex for organic photovoltaic devices

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science China Chemistry 2012年第12期55卷 2562-2566页

作者： LI ZhiGang GAO ZhiQiang WANG HaiShan ZHANG Hui ZHAO XinYan MI BaoXiu HUANG Wei jiangsu engineering centre for flat-panel displays&solid-state lighting and school of materials science&engineering Nanjing University of Posts&Telecommunications Nanjing 210046China Key Laboratory for Organic Electronics&Information displays(KLOEID)and Institute of Advanced materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210046China

An inexpensive material, i.e., tetranuclear zinc（Ⅱ） complex, （Zn40（A/D）6） [AID = 7-azaindolate], was utilized as a cathode buffer in organic photovoltaic （OPV） devices, leading to the improvement of device performance. Compared to OPV devices based on a conventional cathode buffer of TPBi （1,3,5-tris（2-N-phenylbenzimidazolyl）benzene）, although the freshly prepared devices showed similar performance, when heated to a series of high temperatures under air, the short circuit current and the open circuit voltage of the Zn40（AID）6 devices dropped more slowly, indicating the superiority of using Zn40（AID）6 as a cathode buffer over TPBi in OPV devices.

关键词： organic photovoltaic devices thermal stability inexpensive cathode buffer layer

Molecular hosts for triplet emitters in organic light-emitting diodes and the corresponding working principle

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science China Chemistry 2010年第8期53卷 1679-1694页

作者： MI BaoXiu1,2,GAO ZhiQiang1,LIAO ZhangJin2,HUANG Wei2 & CHEN Chin Hsin3 1jiangsu engineering Center for flat-panel displays & solid-state lighting school of materials science & engineering,Nanjing University of Posts & Telecommunications,Nanjing 210046,China 2Key Laboratory for Organic Electronics & Information displays (KLOEID),Institute of Advanced materials (IAM),Nanjing University of Posts & Telecommunications,Nanjing 210046,China 3Display Institute,Microelectronics and Information Systems Research Center,National Chiao Tung University Hsinchu,Hsinchu,300 China jiangsu engineering Center for flat-panel displays & solid-state lighting school of materials science & engineering Nanjing University of Posts & Telecommunications Nanjing China Key Laboratory for Organic Electronics & Information displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications Nanjing China Display Institute Microelectronics and Information Systems Research Center National Chiao Tung University Hsinchu Hsinchu China

This paper summarizes the mechanism and routes for excitation of triplet emitters in dopant emission based phosphorescent organic light-emitting diodes (PhOLEDs),providing a comprehensive overview of recent progress in molecular hosts for triplet emitters in ***,based on the nature of different hosts,e.g.,hole transporting,electron transporting or bipolar materials,in which the dopant emitters can be hosted to generate phosphorescence,the respective device performances are summarized and *** are given to the relationships among the molecular structure,thermal stability,triplet energy,carrier mobility,molecular orbital energy level and their corresponding device performances.

关键词： phosphorescent organic light-emitting diodes (OLEDs) working principle electrophosphorescence hosts triplet emitter