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注入和输运对单层有机发光器件复合发光的影响
引用本文:李宏建,易丹青,黄伯云,彭景翠.注入和输运对单层有机发光器件复合发光的影响[J].光子学报,2003,32(12):1446-1449.
作者姓名:李宏建  易丹青  黄伯云  彭景翠
作者单位:1. 中南大学材料科学与工程学院,长沙,410083;粉末冶金国家重点实验室,长沙,410083;湖南大学应用物理系,长沙,410082
2. 中南大学材料科学与工程学院,长沙,410083
3. 粉末冶金国家重点实验室,长沙,410083
4. 湖南大学应用物理系,长沙,410082
基金项目:SupportedbyHunanNaturalScienceFoundaion (No .98JJY2 0 4 7)andHunanEducationScienceFoundation(No .2 0 0 0B0 0 6 )
摘    要:通过分析聚合物电致发光器件中载流子注入、输运、激子的解离与复合过程,提出了激子解离与复合的理论模型. 基于电流连续性方程和Poisson方程,给出了激子复合密度、电流密度及复合效率表达式.研究两电极与有机层之间在Ohmic和Fowler-Nordheim接触条件下载流子迁移率对器件中激子的复合密度及外加电压和注入势垒对器件电流和复合效率的影响.结果表明:1)在一个较宽的注入势垒和迁移率范围内,复合密度不是由两个注入电极的相对注入比决定而是由有机层电子和空穴迁移率之比所支配;2)固定阴极势垒,而阳极势垒由小变大时,器件电流由接触限制向空间电荷限制转变;3)复合效率随外电压升高先增加,当电压达一临界值时而陡降,存在一个最佳的注入势垒值.结果说明:电极与有机层的能带匹配及有机层间的迁移率匹配对器件复合发光有着极其重要的影响.其计算值与所报道的理论结果相符.

关 键 词:电致发光  注入势垒  载流子迁移率  复合密度
收稿时间:2003-01-09

Influence of Injection and Transport on Carriers Recombination in Single Layer Organic Light-emitting Devices
Abstract.Influence of Injection and Transport on Carriers Recombination in Single Layer Organic Light-emitting Devices[J].Acta Photonica Sinica,2003,32(12):1446-1449.
Authors:Abstract
Institution:1. College of Materials Science and Engineering, Changsha 410083;2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083;3. Department of Applied Physics, Hunan University, Changsha 410082
Abstract:Formation and fission of excitons in organic light-emitting devices were investigated in detail. Based on current continuity equations and Poisson′s equation, a complete analytic function for recombination density, current density and recombination efficiency was presented. The results indicate that 1) Recombination density profile in single layer organic LEDs is found to be dictated primarily by the ratio of the carrier mobility and not by the relative injection ratio at anode and cathode at the wide range of mobilities and injection barriers. In the general case, the greatest recombination occurs near that electrode, from where it injects the carriers with lower mobility; 2) The current-voltage characteristics show that fixing the cathode barrier and varying the anode barrier will result in the transition between space-charge-limited and contact-limited current flow; 3) The recombination efficiency is enhanced firstly and then decreased sharply and exists an optimum barrier value, with applied voltage increasing. These theoretical values are agreement with the related experimental data.
Keywords:Electroluminescence  Injection barrier  Mobility  Recombination density  
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