Delayed fluorescence and phosphorescence of tris-(8-hydroxyquinoline)aluminum (Alq3) and their temperature dependence

被引：21

作者：

Cölle, M ^{[1
]}

Gärditz, C ^{[1
]}

机构：

[1] Univ Bayreuth, Bayreuther Inst Makromol Forsch, D-95440 Bayreuth, Germany

来源：

JOURNAL OF LUMINESCENCE | 2004年 / 110卷 / 04期

关键词：

tris-(8-hydroxyquinoline)aluminum; triplet; phosphorescence; delayed fluorescence; isomers; temperature dependence;

D O I：

10.1016/j.jlumin.2004.08.009

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This paper reports on delayed luminescence measurements of tris-(8-hydroxyquinoline)aluminum (Alq(3)) after optical excitation; these identify two bands in the emission spectrum: delayed fluorescence and phosphorescence. This is shown for different crystalline phases and for evaporated films. The assignment of the low-energy band to the phosphorescence is confirmed by lifetime measurements, and triplet energies of the meridional isomer in the alpha-phase and the facial isomer in the delta-phase are determined from the well-resolved vibronic progressions of the phosphorescence as 2.11+/-0.1 and 2.16+/-0.1 eV, respectively. Lifetimes of the delayed fluorescence and the phosphorescence are determined for a temperature range from 6 to 150 K, and we measured the temperature dependence of the delayed photoluminescence spectra. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：200 / 206

页数：7

共 27 条

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