Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices

SU Wen-ming; LI Wen-lian; KONG Zhi-guo; ZHU Jian-zhuo; YANG Dong-fang

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Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices

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- Direct Observation of Enhanced Electrofluorescence Emission through Triplet-triplet Annihilation in Organic Light-emitting Devices
- Chinese Journal of Luminescence Vol. 28, Issue 3, Pages: 437-439(2007)
- 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：
- DOI：
  CLC： TN383.1
- Published：20 May 2007，
  
  Received：20 February 2007，
  
  Revised：16 March 2007，
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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.

关键词

三重态-三重态湮灭DMQA有机电致发光

Keywords

T-T annihilationDMQAOLEDs

references

Adachi C,Baldo M A,Thompson M E,et al.Nearly 100% internal phosphorescence efficiency in an organic light-emitting device[J].J.Appl.Phys.,2001,90(10):5048-5051.

Baldo M A,O'Brien D F,You Y,et al.Highly efficient phosphorescent emission from organic electroluminescent devices[J].Nature,1998,395:151-154.

Baldo M A,Adachi C,Forrest S R,et al.Transient analysis of organic electrophosphorescence:Ⅱ.Transient analysis of triplet-triplet annihilation[J].Phys.Rev.B,2000,62(16):10967-10977.

Pope M,Swenberg C E.Electronic Processes in Organic Crystals and Polymers[M].2nd Oxford University Press,New York,1999,64.

Baldo M A,O'Brien D F,Thompson M E,et al.Excitonic singlet-triplet ratio in a semiconducting organic thin film[J].Phys.Rev.B,1999,60(20):14422-14428.

Ganzorig C,Fujihira M.A possible mechanism for enhanced electrofluorescence emission through triplet-triplet annihilation in organic electroluminescent devices[J].Appl.Phys.Lett.,2002,81(17):3137-3139.

Yamamoto H,Kasajima H,Yokoyama W,et al.Extremely-high-density carrier injection and transport over 12 000 A/cm2 into organic thin films[J].Appl.Phys.Lett.,2005,86(8):083502-083504.

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