摘要
用高荧光染料的 5 ,6 ,11,12 四苯基四苯并对 8 羟基喹啉铝进行掺杂 ,测量其光致发光和电致发光谱。结果表明 :在低掺杂时 ,主发光体是Alq ,掺入的Rubrene作为客发光体只是在Alq带隙中引入了分立能级 ;随着掺入的Rubrene浓度增加 ,Rubrene成了主发光体 ,Alq变成了客发光体 ,出现了发光体的互换现象。由于Rubrene的吸收光谱与Alq的发射谱重叠较大 ,在光致发光中存在从Alq向Rubrene的能量传递和电荷转移过程 ,而电致发光则是由于Rubrene导带 (LUMO)比Alq导带 (LUMO)低很多 ,且它们价带 (HOMO)基本相同 ,使得从负电极注入到Rubrene导带中电子浓度远大于注入到Alq导带中电子浓度 ,造成Rubrene导带电子与价带空穴复合的几率比Alq中的复合几率大得多 。
The PL and EL spectra of 5,6,11,12-tetraphenyl-tetracene doped 8-hydroxyquinoline are measured. It is found that Alq is host emitter when dopant concentration is low, and a discrete level is introduced by doping Rubrene (guest emitter) in Alq energy gap. As increasing Rubrene concentration, Rubrene is host emitter but Alq becomes guest emitter. Because overlap between absorption spectrum of Rubrene and emission spectrum of Alq is greater, the energy transfer and charge transfer between host emitter and guest emitter are occurred in PL of doping Alq thin film. As conductive band (LUMO) of Rubrene is much lower than that of Alq, and their valence bands (HOMO) are about the same, and electron concentration of conductive band of Rubrene is much greater than that of Alq, the rate of recombination between the electrons in conductive band and holes in valence band of Rubrene is much greater than in Alq, so EL is mainly emission of Rubrene.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2002年第5期718-720,共3页
Spectroscopy and Spectral Analysis
基金
湖南省自然科学基金 (98JJY2 0 4 7)
湖南省教委青年基金 (2 0 0 0B0 0 6)资助
