High Efficiency Doping-free White Organic Light Emitting Diodes by Combining Exciplex and Phosphorescent Ultrathin Layer

Chao WANG; Xiang-feng LI; Ze-mei LIU; Bo ZHAO

doi:10.37188/CJL.20210336

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High Efficiency Doping-free White Organic Light Emitting Diodes by Combining Exciplex and Phosphorescent Ultrathin Layer

Device Fabrication and Physics | 更新时间：2022-01-14

- High Efficiency Doping-free White Organic Light Emitting Diodes by Combining Exciplex and Phosphorescent Ultrathin Layer
  增强出版
- Chinese Journal of Luminescence Vol. 43, Issue 1, Pages: 85-93(2022)
- 作者机构：
  
  1.华为技术有限公司，广东　深圳　518129
  2.成都中电熊猫显示科技有限公司，四川　成都　610200
  3.太原理工大学　新材料界面科学与工程教育部重点实验室，山西　太原　030024
- 作者简介：
- 基金信息：
  
  Fundamental Research Program of Shanxi Province(20210302123113);National Natural Science Foundation of China(62074109;61775155;61605137);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2020104)
- DOI：10.37188/CJL.20210336
  CLC： TN312.8
- Published：2022-01，
  
  Received：28 October 2021，
  
  Revised：27 November 2021，
- 稿件说明：
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CHAO WANG, XIANG-FENG LI, ZE-MEI LIU, et al. High Efficiency Doping-free White Organic Light Emitting Diodes by Combining Exciplex and Phosphorescent Ultrathin Layer. [J]. Chinese journal of luminescence, 2022, 43(1): 85-93.
DOI：

CHAO WANG, XIANG-FENG LI, ZE-MEI LIU, et al. High Efficiency Doping-free White Organic Light Emitting Diodes by Combining Exciplex and Phosphorescent Ultrathin Layer. [J]. Chinese journal of luminescence, 2022, 43(1): 85-93. DOI： 10.37188/CJL.20210336.

摘要

将蓝光激基复合物mCP∶PO-T2T和磷光超薄层结合，分别制备了基于Ir(pq)

acac(~0.5 nm)/mCP∶PO-T2T/Ir(pq)

acac(~0.5 nm)结构的双色互补色和基于Ir(ppy)

(~0.5 nm)/mCP∶PO-T2T/Ir(pq)

acac (~0.5 nm)结构的三基色非掺杂白光有机发光二极管(White organic light emitting diodes

WOLED)，以探索超薄层在激基复合物中的应用。所制备的双色互补色WOLED，其最大电流效率、功率效率和外量子效率分别为46.1 cd/A、43.9 lm/W和22.2%，而三基色WOLED所实现的最大电流效率、功率效率和外量子效率分别为66.8 cd/A、63.5 lm/W和24.2%。研究分析表明，从高能的蓝光激基复合物发光层向两侧低能的红光和绿光磷光超薄层有效的能量传递是实现非掺杂WOLED高效率的原因。

Abstract

In this work

we prepared doping-free white organic light emitting diodes(WOLED) by combining exciplex and phosphorescent ultrathin layer. As results

high efficiency WOLED based two complementary color structure of Ir(pq)

acac(~0.5 nm)/mCP∶PO-T2T/Ir(pq)

acac(~0.5 nm) and red-green-blue(RGB) color structure of Ir(ppy)

(~0.5 nm)/mCP∶PO-T2T/Ir(pq)

acac(~0.5 nm) are achieved by setting different colors phosphorescent ultrathin layer on the two sides of blue exciplex emitting layer of mCP∶PO-T2T

respectively. The maximum current efficiency

power efficiency and external quantum efficiency of two complementary color WOLED are 46.1 cd/A

43.9 lm/W and 22.2%

respectively; and the RGB WOLED are 66.8 cd/A

63.5 lm/W and 24.2%

respectively. The discussions demonstrated the efficient energy transfer from high energy blue exciplex to low energy red and green phosphorescent ultrathin layer is responsible for the high efficiency of doping-free WOLED.

关键词

白光有机发光二极管激基复合物超薄层非掺杂

Keywords

white organic light emitting diodesexciplexultrathin layerdoping-free

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