Ultra-low Efficiency Roll-off Top-emitting White Organic Light-emitting Diodes

Rong-mei YU; Chun-ying PU; Fu-rong YIN; Wen-yu JI

doi:10.37188/CJL.20210325

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Ultra-low Efficiency Roll-off Top-emitting White Organic Light-emitting Diodes

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

- Ultra-low Efficiency Roll-off Top-emitting White Organic Light-emitting Diodes
  增强出版
- Chinese Journal of Luminescence Vol. 43, Issue 1, Pages: 77-84(2022)
- 作者机构：
  
  1.南阳师范学院　物理与电子工程学院，河南省MXene材料微结构国际联合实验室，河南　南阳　473061
  2.吉林大学　物理学院，吉林　长春　130012
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(11974141);the Key Science Fund of Educational Department of Henan Province of China(22A140008)
- DOI：10.37188/CJL.20210325
  CLC： TN383⁺.1
- Published：2022-01，
  
  Received：13 October 2021，
  
  Revised：26 October 2021，
扫描看全文
Rong-mei YU, Chun-ying PU, Fu-rong YIN, et al. Ultra-low Efficiency Roll-off Top-emitting White Organic Light-emitting Diodes. [J]. Chinese Journal of Luminescence 43(1):77-84(2022)
DOI：

Rong-mei YU, Chun-ying PU, Fu-rong YIN, et al. Ultra-low Efficiency Roll-off Top-emitting White Organic Light-emitting Diodes. [J]. Chinese Journal of Luminescence 43(1):77-84(2022) DOI： 10.37188/CJL.20210325.

摘要

利用Ag/tris-(8-hydroxyquinoline) aluminum(Alq

)/Ag/Alq

/Ag这一金属/有机半导体多层结构作为阳极，实现了超低效率滚降的顶发射白光器件。在该器件中，我们在蓝光和橙光发光单元之间引入一个薄的4

4'-bis(9-carbazolyl)-2

2'-biphenyl(CBP)层，从而减少橙光发光层与蓝光发光层的Dexter能量传递，用以改善白光器件发光光谱及效率。通过优化微腔设计，实现了对橙光磷光材料发射的调控。最终，我们获得了在60 000 cd/m

亮度下效率滚降仅为17%的顶发射白光器件。在效率方面，虽然顶发射白光器件与底发射白光器件不相上下，但由于微腔效应的存在，顶发射白光器件的效率滚降却远低于底发射白光器件的效率滚降。

Abstract

White top-emitting organic light-emitting devices(TEOLEDs) with very low efficiency roll-off are obtained by utilizing Ag/Alq

/Ag/Alq

/Ag as an anode. A neat bipolar transport 4

4'-bis(9-carbazolyl)-2

2'-biphenyl(CBP) layer is introduced between the blue fluorescent and the orange phosphorescent emission layers in order to reduce the Dexter energy transfer between the two emissive units

which can improve the emission spectrum and device efficiency. The yellow emission from bis(2-(2-fluorphenyl)-1

3-benzothiozolato-N

C2') iridium(acetylacetonate) is manipulated by optimizing the microcavity effect of the TEOLED. As a result

we demonstrate that a very low roll-off of 17% for the current efficiency can be obtained at a super high luminance of 60 000 cd/m

. The efficiencies of the white TEOLEDs are comparable to those of the corresponding conventional bottom-emitting OLED. In comparison

the efficiency roll-off of the TEOLEDs is much lower than that of the corresponding conventional bottom-emitting device due to the microcavity effects.

关键词

有机发光器件顶发射微腔效应效率滚降

Keywords

organic light-emitting devicestop-emittingmicrocavity effectefficiency roll-off

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Related Institution

Henan International Joint Laboratory of MXene Materials Microstructure， College of Physics and Electronic Engineering， Nanyang Normal University

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State Key Laboratory on Integrated Optoelectronics, Jilin University Region, College of Electronic Science and Engineering, Jilin University

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