输运层势垒对双层结构器件复合发光的影响  

Influences of Transport Layers Barriers on Recombination Efficiency in Bilayer Organic Devices

作　　者：李宏建[1] 瞿述[1] 许雪梅[1] 彭景翠[1] 

机构地区：[1]湖南大学光电子材料研究所,湖南长沙410082

出　　处：《光谱学与光谱分析》2002年第3期360-362,共3页Spectroscopy and Spectral Analysis

基　　金：湖南省自然科学基金;湖南省教委青年基金资助项目

摘　　要：通过分析双层结构器件复合发光的实际物理过程 ,建立了双层器件载流子输运与复合发光的多势垒的理论模型 ,计算并讨论了器件复合效率随外加电压及输运层势垒 (包括势垒高度和宽度 )的变化关系。该理论模型较好地解释实验现象。Based on the physical processes of carriers transport and recombination, a multibarriers model for carriers transport and recombination in bilayer organic devices is present. The influences of applied bias and thin films (transport layers) barriers on carriers recombination and its efficiency are calculated and discussed. In bilayer organic devices the charge density inside the sample is controlled by interfacial charge accuulation. Interfacial charge accumulation enhances the field in the cell compartment adjecent to the contact at which minority carrier injected. This gives rise to enhanced minority carriers injection and explains why efficient bilayer organic devices can be fabricated. For appopriate values of anodic and cathodic zone energy barriers, a greater recombination efficiency can be acquired. The theory from this model reasonably explained the experimential phenomens, and it proved that the field can control the carriers recombination regions.

关 键 词：输运层 势垒 双层结构器件 复合发光 有机薄膜电致发光器件 载流子 多势垒模型 发光效率 发光机理 

分 类 号：TN383.1[电子电信—物理电子学] O482.31[理学—固体物理]