Air-Stable Ultrabright Inverted Organic Light-Emitting Devices with Metal Ion-Chelated Polymer Injection Layer

Nano-Micro Letters

Dong Shen¹  Shuang Tian¹  Chun-Sing Lee¹  Yan Wu¹  Wenfa Xie²  Chunxiu Zang²  Letian Zhang²  Shihao Liu²  Jiaming Zhang² 

[1] Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong;State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University;

关键词: Air stability;    Ultrabright;    Electron injection;    Metal ion chelation;    Inverted organic light-emitting device;   

DOI  :  10.1007/s40820-021-00745-w

来源: DOAJ

【 摘 要 】

Abstract Here, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups. With these physicochemical properties, the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m−2 and can deliver a maximum brightness of 121,865 cd m−2. Besides, the inverted OLED is also demonstrated to possess an excellent air stability (humidity, 35%) with a half-brightness operating time of 541 h @ 1000 cd m−2 without any protection nor encapsulation.

【 授权许可】

Unknown