A Novel Electron Injection Layer with Co-evaporating Tris (8-hydroxyquinoline) Aluminum Doped Cesium Carbonate in Organic Light-emitting Diodes

HOU Lin-tao; WANG Ping; LIU Peng-yi; ZHANG Jing-lei; WU Chun-hong; LI Yan-wu; WU Bing

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A Novel Electron Injection Layer with Co-evaporating Tris (8-hydroxyquinoline) Aluminum Doped Cesium Carbonate in Organic Light-emitting Diodes

paper | 更新时间：2020-08-12

- A Novel Electron Injection Layer with Co-evaporating Tris (8-hydroxyquinoline) Aluminum Doped Cesium Carbonate in Organic Light-emitting Diodes
- Chinese Journal of Luminescence Vol. 31, Issue 5, Pages: 655-660(2010)
- 作者机构：
  
  暨南大学理工学院物理系,广东广州,510632
- 作者简介：
- 基金信息：
  
  Project supported by the Natural Science Foundation of Guangdong Province(8451063201
- DOI：
  CLC： TN383.1
- Received：26 November 2009，
  
  Revised：2010-1-7，
  
  Published Online：21 September 2010，
  
  Published：21 September 2010
- 稿件说明：
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侯林涛, 王平, 刘彭义, 张靖磊, 武春红, 李艳武, 吴冰. Cs2CO3共蒸阴极对有机电致发光器件性能的影响[J]. 发光学报, 2010,31(5): 655-660

HOU Lin-tao, WANG Ping, LIU Peng-yi, ZHANG Jing-lei, WU Chun-hong, LI Yan-wu, WU Bing. A Novel Electron Injection Layer with Co-evaporating Tris (8-hydroxyquinoline) Aluminum Doped Cesium Carbonate in Organic Light-emitting Diodes[J]. 发光学报, 2010,31(5): 655-660
侯林涛, 王平, 刘彭义, 张靖磊, 武春红, 李艳武, 吴冰. Cs2CO3共蒸阴极对有机电致发光器件性能的影响[J]. 发光学报, 2010,31(5): 655-660 DOI：

HOU Lin-tao, WANG Ping, LIU Peng-yi, ZHANG Jing-lei, WU Chun-hong, LI Yan-wu, WU Bing. A Novel Electron Injection Layer with Co-evaporating Tris (8-hydroxyquinoline) Aluminum Doped Cesium Carbonate in Organic Light-emitting Diodes[J]. 发光学报, 2010,31(5): 655-660 DOI：

摘要

研究了碳酸铯(Cs

)掺杂8-羟基喹啉铝(Alq

)作为电子注入层对有机电致发光器件性能的影响。结果表明

与常用的Cs

超薄层作电子注入层相比

∶ Alq

共蒸阴极对器件效率和亮度有很大提高

器件电流效率从3.1 cd/A (Cs

1 nm/Al)提高到6.5 cd/A (Cs

3% ∶ Alq

/Al)。器件性能的提高归因于Cs

∶ Alq

共蒸阴极比单层Cs

阴极具有更好的电子注入能力和电子传输性能。薄膜形貌表明

共蒸阴极能有效降低Alq

表面粗糙度

有助于提高器件发光性能及寿命。

Abstract

The electron injection mechanism of the effective cathode structure has been investigated

doping cesium carbonate (Cs

) into the organic electron-transport layer

which significantly enhances the electron injection in comparison with an ultra-thin Cs

injection layer

with a notable superiority in both luminance and efficiency. The results show that Cs

doped tris-(8-hydroxyquinoline) aluminum(Alq

) /Al cathode exhibits better electron injection efficiency than that in Cs

/Al bilayer cathode

thus a maximum current efficiency of 6.5 cd/A (3.1 cd/A for Cs

/Al) is obtained for 30% Cs

doping concentration device. It is proposed that this improved efficiency is related to the greatly enhanced electron injection at the Alq

∶ Cs

/Al cathode interface and efficient electron transport in the bulk of the Cs

∶ Alq

layer. The result from atomic force microscopy shows that with the insertion of Alq

∶ Cs

layer

the roughness of Alq

surface decreases

which is favorable to improve the device luminance and increase the device lifetime.

关键词

Keywords

references

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