有机电致发光器件中观察到的三重态-三重态湮灭导致的荧光发射

苏文明; 李文连; 孔治国; 朱键卓; 杨栋芳

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有机电致发光器件中观察到的三重态-三重态湮灭导致的荧光发射

论文 | 更新时间：2020-08-11

- 有机电致发光器件中观察到的三重态-三重态湮灭导致的荧光发射
- Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices
- 发光学报 2007年28卷第3期页码：437-439
- 作者机构：
  
  1. 中国科学院, 研究生院北京,100049
  2. 中国科学院长春光学精密机械与物理研究所, 激发态物理重点实验室,吉林长春,130033
- 作者简介：
- 基金信息：
  
  国家自然科学基金资助项目(90201012)()
- DOI：
  中图分类号： TN383.1
- 收稿日期：2007-02-20，
  
  修回日期：2007-03-16，
  
  纸质出版日期：2007-05-20
- 稿件说明：
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苏文明, 李文连, 孔治国, 朱键卓, 杨栋芳. 有机电致发光器件中观察到的三重态-三重态湮灭导致的荧光发射[J]. 发光学报, 2007,28(3): 437-439

SU Wen-ming, LI Wen-lian, KONG Zhi-guo, ZHU Jian-zhuo, YANG Dong-fang. Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices[J]. Chinese Journal of Luminescence, 2007,28(3): 437-439
苏文明, 李文连, 孔治国, 朱键卓, 杨栋芳. 有机电致发光器件中观察到的三重态-三重态湮灭导致的荧光发射[J]. 发光学报, 2007,28(3): 437-439 DOI：

SU Wen-ming, LI Wen-lian, KONG Zhi-guo, ZHU Jian-zhuo, YANG Dong-fang. Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices[J]. Chinese Journal of Luminescence, 2007,28(3): 437-439 DOI：

摘要

在高浓度DMQA掺杂于Alq

作为发射层的器件中直接观察到了超线性的发射增强现象.当DMQA的浓度在1.6%~5.6%之间时

电流密度大于300mA/cm

电致发光效率随电流密度的增大而增加.这是由于在重掺杂器件中

较多的染料有效的转移了Alq

中的激子

降低了器件中的非辐射损失

同时

三重态-三重态湮灭过程产生了新的单重态激子

贡献了额外发光的结果.当后者的贡献大于器件中的非辐射损失时

器件的发光效率将随电流的增大而上升.

Abstract

With N

N-dimethyl-quinacridone (DMQA) heavily doped into tris-(8-hydroxyquinoline) aluminum (Alq

) as emission layer

a super-linear luminance enhancement with the increase of current density in organic light-emitting devices was observed. When the concentration of DMQA was 1.6%~5.6%(in mass fraction) and the current density excess 300mA/cm

contrary to the roll-off in electroluminescence (EL) efficiency

the EL efficiency ascends with current density. About~0.22 cd/A enhanced EL efficiency is observed from 300mA/cm

to 700 mA/cm

which is believed to be contributed to the extra regenerated singlet excitons resulted from T-T annihilation.

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references

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利用有机层间互相掺杂提高有机电致发光器件的效率