Title

5,6,11,12-四苯基四苯並摻雜8-羥基喹啉鋁薄膜的熒光譜及發光機理

Translated Titles

Mechanism and Fluorescence Spectra of 5, 6, 11, 12-Tetraphenly-tetracene Doped 8-Hydroxyquinoline System

Authors

李宏建(Hong-Jian Li);彭景翠(Jing-Cui Peng);瞿述(Shu Qu);夏輝(Hui Xia);許雪梅(Xue-Mei Xu);羅小華(Xiao-Hua Luo)

Key Words

熒光譜 ; 分立能級 ; 電荷轉移 ; Fluorescence spectrum ; Distrete level ; Charge transfer

PublicationName

光譜學與光譜分析

Volume or Term/Year and Month of Publication

22卷5期(2002 / 10 / 01)

Page #

718 - 720

Content Language

簡體中文

Chinese Abstract

用高熒光染料的5,6,11,12-四苯基四苯並對8-羥基喹啉鋁進行摻雜,測量其光致發光的電致發光譜。結果表明:在低摻雜時,主發光體是Alq,摻入的Rubrene作爲客發光體只是在Alq帶隙中引入分立能級;隨著摻入的Rubrene濃度增加,Rubrene成了主發光體,Alq變成了客發光體,出現了發光體的互換現象。由於Rubrene的吸收光譜與Alq的發射譜重疊較大,在光致發光中存在從Alq向Rubrene的能量傳遞和電荷轉移過程,而電致發光則是由於Rubrene導帶(LUMO)比Alq導帶(LUMO)低很多,且它們價帶(HOMO)基本相同,使得從負電極注入到Rubrene導帶中電子濃度遠大於注入到Alq導帶中電子濃度,造成Rubrene導帶電子與價帶空穴複合的幾率比Alq中的複合幾率大得多,其EL主要是Rubrene的發光。

English Abstract

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 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 of Rubrene is much greater than that of Alq, the rate of recombination between the electrons in 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.

Topic Category 基礎與應用科學 > 物理
基礎與應用科學 > 化學