Effect of Spacer on White Organic Light-emitting Devices Consisted of Double Light-emitting Layers

LI Qing; ZHAO Juan; WANG Qi; YU Jun-sheng

doi:10.3788/fgxb20123301.0045

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Effect of Spacer on White Organic Light-emitting Devices Consisted of Double Light-emitting Layers

paper | 更新时间：2020-08-12

- Effect of Spacer on White Organic Light-emitting Devices Consisted of Double Light-emitting Layers
- Chinese Journal of Luminescence Vol. 33, Issue 1, Pages: 45-50(2012)
- 作者机构：
  
  电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室, 四川成都 610054
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20123301.0045
  CLC： TN383+.1
- Received：25 January 2011，
  
  Revised：24 June 2011，
  
  Published Online：10 January 2012，
  
  Published：10 January 2012
- 稿件说明：
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李青, 赵娟, 王琦, 于军胜. 间隔层对双发光层白色有机电致发光器件性能的影响[J]. 发光学报, 2012,33(1): 45-50

LI Qing, ZHAO Juan, WANG Qi, YU Jun-sheng. Effect of Spacer on White Organic Light-emitting Devices Consisted of Double Light-emitting Layers[J]. 发光学报, 2012,33(1): 45-50
李青, 赵娟, 王琦, 于军胜. 间隔层对双发光层白色有机电致发光器件性能的影响[J]. 发光学报, 2012,33(1): 45-50 DOI： 10.3788/fgxb20123301.0045.

LI Qing, ZHAO Juan, WANG Qi, YU Jun-sheng. Effect of Spacer on White Organic Light-emitting Devices Consisted of Double Light-emitting Layers[J]. 发光学报, 2012,33(1): 45-50 DOI： 10.3788/fgxb20123301.0045.

摘要

采用蓝色bis (FIrpic)和黄色bis iridium(acetylacetonate) 两种磷光染料

制备了双发光层结构的白色有机电致发光器件

器件结构为ITO/TAPC (30 nm)/host: (t-bt)

Ir(acac) /spacer (

nm)/host: FIrpic (15 nm

8%)/Bphen (40 nm)/Mg∶Ag (200 nm)。分别选用p型1

1-bis cyclohexane (TAPC)和n型tris borane (3TPYMB)作为主体材料制备了两种类型的器件

通过在两个发光层之间加入一层较薄的间隔层进行器件优化。结果表明

加入间隔层之后

器件性能得到提高

获得了色稳定性较好的白光器件。当主体为TAPC时

使用间隔层后器件取得最大亮度为19 550 cd/m

最大电流效率为8.3 cd/A;当主体为3TPYMB时

使用间隔层后器件的最大亮度为1 950 cd/m

最大电流效率为30.7 cd/A。实验结果表明

器件性能的提高

是由于加入了间隔层之后载流子复合区域拓宽

促进了发光层中电子和空穴的平衡。

Abstract

White organic light-emitting devices (WOLEDs) with double light-emitting layers (EMLs) were fabricated

which were based on phosphorescent blue bis[3

5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium Ⅲ](FIrpic) and yellow bis[2-(4-tertbutylphenyl)benzothiazolato-N

] iridium (acetylacetonate) [(t-bt)

Ir(acac)]. Device structure was given as:ITO/TAPC (30 nm)/host:(t-bt)

Ir(acac)[(10-

) nm

4%]/spacer (

nm)/host:FIrpic (15 nm

8%)/Bphen (40 nm)/Mg∶Ag (200 nm)

while p-type 1

1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) and n-type tris[3-(3-pyridyl)-mesityl]

borane (3TPYMB) was separately employed as the host

and device optimization was made by introducing a spacer between the two EMLs. The results showed that

compared with that of spacer-without device

the devices employed a spacer yielded higher device performance as well as stable white emission. For TAPC as the host

a device with spacer obtained maximum luminance of 19 550 cd/m

and power efficiency of 8.3 cd/A

while 3TPYMB as the host

a device with spacer achieved maximum luminance of 1 950 cd/m

and power efficiency of 30.7 cd/A. It was suggested that by incorporating a spacer in the WOLEDs

charge carrier recombination zone was broadened

and electron-hole balance was improved in the EMLs.

关键词

Keywords

references

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