Highly efficient tandem PHOLEDs with lithium-doped BPhen/NDP-9-doped TAPC as a charge generation layer

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Information Display Pub Date : 2021-07-02 DOI:10.1080/15980316.2021.1947403
W. Park, Dong-pil Park, Sang Soo Kim
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引用次数: 5

Abstract

The development of large-area organic light-emitting diode (OLED) displays requires a highly efficient tandem device architecture and an easily processable charge generation layer (CGL) with a low voltage drop and high optical transparency. In this study, we investigated and applied a doped organic n-CGL/p-CGL using thermal vacuum deposition in tandem OLED devices. A doping concentration of 1.0 wt.% for Li in 4, 7-Diphenyl-1, 10-phenanthroline (BPhen) was optimal for the n-CGL with 8 wt.% for 2-(7-dicyanomethylene-1,3,4,5,6,8,9,10-octafluoro-7H-pyrene-2-ylidene)-malononitrile (NDP-9)-doped N,N-bis(4-methylphenyl)benzenamine (TAPC) as a p-CGL. Maximum luminous efficiencies of 42.5 and 63.4 cd/A and a 4,000 cd/m2 current density for the target luminance values of 11.2 and 6.5 mA/cm2 were demonstrated for double-stack and triple-stack tandem blue phosphorescent OLED devices, respectively. Implementing these highly efficient tandem device structures will improve the overall lifetime of OLED displays by lowering their operating current density at the target luminance.
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锂掺杂BPhen/NDP-9掺杂TAPC作为电荷产生层的高效串联PHOLED
大面积有机发光二极管(OLED)显示器的开发需要高效的串联器件结构和具有低电压降和高光学透明度的易于处理的电荷产生层(CGL)。在本研究中,我们使用热真空沉积在串联OLED器件中研究并应用了掺杂的有机n-CGL/p-CGL。掺杂浓度为1.0 在4,7-二苯基-1,10-菲咯啉(BPhen)中,Li的wt.%对于具有8 2-(7-二氰基亚甲基-1,3,4,5,6,8,9,10-八氟-7H-芘-2-亚基)-丙二腈(NDP-9)-掺杂的N,N-双(4-甲基苯基)苯胺(TAPC)作为p-CGL的重量%。最大发光效率为42.5和63.4 cd/A和一个4000 目标亮度值为11.2和6.5时的cd/m2电流密度 mA/cm2分别用于双堆叠和三堆叠串联蓝色磷光OLED器件。实现这些高效串联器件结构将通过降低OLED显示器在目标亮度下的工作电流密度来提高OLED显示器的整体寿命。
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来源期刊
Journal of Information Display
Journal of Information Display MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.10
自引率
5.40%
发文量
27
审稿时长
30 weeks
期刊最新文献
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