聚烷基芴电场调制光谱研究  

Studies on Photoluminescence Spectra of Polyfluorene under Modulation of Electric Field

作　　者：李云白[1] 滕枫[1] 徐征[1] 侯延冰[1] 徐叙瑢[1] 

机构地区：[1]北京交通大学光电子技术研究所,北京100044

出　　处：《光谱学与光谱分析》2005年第7期1030-1033,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(69977001;90301004;10374001);教育部"跨世纪人才"计划;"973"计划(2003CB314707)资助项目

摘　　要：有机发光材料和器件中相关物理机制是一个人们普遍关心的问题,特别是电场作用下的有机半导体激发态的行为格外引起人们的关注。电场调制发光光谱是研究在电场中元激发的产生和发展的非常有效的方法。文章利用电场调制光致发光(PL)方法研究了聚烷基芴的PL电场猝灭效应,得到聚烷基芴激子离化随电场强度变化的规律和载流子平均跳跃距离。研究还显示PL猝灭因子随激发波长的变化,短波长激发光时猝灭因子大。The photolurninescence of polyfluorene thin film modulated by an electric field are studied. The results show that the photolurninescenee from polyfluorene film can obviously quenched by the extra electric field, which is attributed to the electric field-induced dissociation of photogeneration excitons. The dependence of the exciton dissociation rate constant on the intensity of electric filed is fitted. The average hopping distance of element charge is 0.68 nm in PFO. This volume is comparable with the reported results in Alq3 and polymers. The spectral dependence of the factor of EFIQP is given. The dissociation of hot-exeiton is deduced, which influences on the spectral dependence of the EFIQP factor slightly.

关 键 词：聚烷基芴 电场调制光致发光 激子离化 

分 类 号：O482.3[理学—固体物理]