High efficiency doping-free warm-white organic light-emitting diodes with strategic-tuning of radiative excitons by combining interfacial exciplex with multi-ultrathin emissive layers

被引：8

作者：

Ying, Shian ^{[1
,2
]}

Chen, Yuwen ^{[2
]}

Yao, Jingwen ^{[2
]}

Sun, Qian ^{[2
]}

Dai, Yanfeng ^{[2
]}

Yang, Dezhi ^{[2
]}

Qiao, Xianfeng ^{[2
]}

Chen, Jiangshan ^{[2
]}

Ma, Dongge ^{[2
]}

机构：

[1] Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Peoples R China

[2] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, Ctr Aggregat Induced Emiss, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

来源：

ORGANIC ELECTRONICS | 2020年 / 85卷

基金：

中国国家自然科学基金;

关键词：

Interfacial exciplex; Ultrathin emissive layer; White organic light-emitting diodes; Doping-free device structure; BLUE PHOSPHORESCENT OLEDS; COLOR-RENDERING INDEX; TRIPLET EXCITONS; HIGH-PERFORMANCE; ROLL-OFF; ENERGY-TRANSFER; EMITTERS; DEVICES; SINGLET; MANAGEMENT;

D O I：

10.1016/j.orgel.2020.105876

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

White organic light-emitting diodes (WOLEDs) have widely drawn attention for applications in flat panel display and solid-state lighting. High efficiency and simple device structure are two important factors for large-scale application for WOLEDs. Here, we have presented a relatively reliable method to develop high-performance and doping-free WOLEDs by integrating interfacial exciplex with phosphorescent multi-ultrathin emissive layers. By reasonable design of device architecture, the resulting WOLED with a warm-white light not only realizes a low turn-on voltage of 2.25 V, but also exhibits the high forward-viewing power efficiency and external quantum efficiency of 91.5 lm W-1 and 21.3%, respectively, without light out-coupling enhancement techniques. More importantly, the power efficiency still remain as high as 49.5 lm W-1 at the high luminance of 1000 cd m(-2), which should be one of the best values in reported doping-free WOLEDs. It suggests that multi-ultrathin emissive layers combining with interfacial exciplex can realize the efficient utilization of excitons and improvement of efficiency roll-off.

引用

页数：7

共 52 条

[1]

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