Ligand effect on the electroluminescence mechanism in lanthanide (III) complexes

被引：41

作者：

Kim, HJ

Lee, JE

Kim, YS ^{[1
]}

Park, NG

机构：

[1] Hongik Univ, Dept Sci, Seoul 121791, South Korea

[2] Hongik Univ, Res Inst Sci & Technol, Seoul 121791, South Korea

[3] Hongik Univ, Dept Chem Engn, Seoul 121791, South Korea

来源：

OPTICAL MATERIALS | 2003年 / 21卷 / 1-3期

关键词：

energy transfer mechanism; electroluminescene; lanthanide complex;

D O I：

10.1016/S0925-3467(02)00133-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The lanthanide complexes have been applied as emitting materials and have been anticipated to exhibit high efficiency along with a narrow emission spectrum since both singlet and triplet excitons of ligands are involved in the luminescence process. With increasing current, however, the quantum efficiencies have decreased significantly due to the triplet-triplet annihilation. The effect of the energy levels of singlet and triplet states of ligands have been studied and the efficient energy transfer mechanism to overcome triplet-triplet annihilation is proposed. The calculation shows that the triplet state as well as the singlet state of the ligand affects the quantum efficiency. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：181 / 186

页数：6

共 22 条

[1] Electroluminescence mechanisms in organic light emitting devices employing a europium chelate doped in a wide energy gap bipolar conducting host [J].