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

被引：0

作者：

Wang C. ^{[1
]}

Li X.-F. ^{[2
]}

Liu Z.-M. ^{[3
]}

Zhao B. ^{[3
]}

机构：

[1] Huawei Technologies Co., Ltd., Shenzhen

[2] Chengdu CEC Panda Display Technology Co., Ltd., Chengdu

[3] Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan

来源：

Faguang Xuebao/Chinese Journal of Luminescence | 2022年 / 43卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Doping-free; Exciplex; Ultrathin layer; White organic light emitting diodes;

D O I：

10.37188/CJL.20210336

中图分类号：

学科分类号：

摘要：

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)2acac(~0.5 nm)/mCP:PO-T2T/Ir(pq)2acac(~0.5 nm) and red-green-blue(RGB) color structure of Ir(ppy)3(~0.5 nm)/mCP:PO-T2T/Ir(pq)2acac(~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. © 2022, Science Press. All right reserved.

引用

页码：85 / 93

页数：8

共 29 条

[1]

KIDO J, HONGAWA K, OKUYAMA K, Et al., White light-emitting organic electroluminescent devices using the poly (N-vinylcarbazole) emitter layer doped with three fluorescent dyes, Appl. Phys. Lett, 64, 7, pp. 815-817, (1994)

[2]

SUN Y R, GIEBINK N C, KANNO H, Et al., Management of singlet and triplet excitons for efficient white organic light-emitting devices, Nature, 440, 7086, pp. 908-912, (2006)

[3]

SUN N, WANG Q, ZHAO Y B, Et al., High-performance hybrid white organic light-emitting devices without interlayer between fluorescent and phosphorescent emissive regions, Adv. Mater, 26, 10, pp. 1617-1621, (2014)

[4]

NISHIDE J I, NAKANOTANI H, HIRAGA Y, Et al., High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence, Appl. Phys. Lett, 104, 23, (2014)

[5]

WANG P, WANG Z, ZHENG X, Et al., Effects of interlayer on white organic light-emitting diodes based on three primary colors, Chin. J. Lumin, 39, 6, pp. 809-814, (2018)

[6]

CHOUKRI H, FISCHER A, FORGET S, Et al., White organic light-emitting diodes with fine chromaticity tuning via ultrathin layer position shifting, Appl. Phys. Lett, 89, 18, (2006)

[7]

ZHAO Y B, CHEN J S, MA D G., Ultrathin nondoped emissive layers for efficient and simple monochrome and white organic light-emitting diodes, ACS Appl. Mater. Interfaces, 5, 3, pp. 965-971, (2013)

[8]

ZHAO B, ZHANG H, WANG Z Q, Et al., Non-doped white organic light-emitting diodes with superior efficiency/color stability by employing ultra-thin phosphorescent emitters, J. Mater. Chem. C, 6, 15, pp. 4250-4256, (2018)

[9]

XUE C, JIANG X, ZHANG G, Et al., Bipolar TADF interlayer for high performance hybrid WOLEDs with an ultrathin non-doped emissive layer architecture, Opt. Mater, 111, (2021)

[10]

ZHAO B, ZHANG T Y, CHU B, Et al., Highly efficient tandem full exciplex orange and warm white OLEDs based on thermally activated delayed fluorescence mechanism, Org. Electron, 17, pp. 15-21, (2015)

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