Issue

Vol. 14 (2022)

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

https://doi.org/10.1007/s40820-021-00745-w
Shihao Liu
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Chunxiu Zang
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Jiaming Zhang
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Shuang Tian
Department of Chemistry, Center of Super‑Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China
Yan Wu
Department of Chemistry, Center of Super‑Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China
Dong Shen
Department of Chemistry, Center of Super‑Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China
Letian Zhang
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Wenfa Xie
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Chun‑Sing Lee
Department of Chemistry, Center of Super‑Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China

Corresponding Author: Chun‑Sing Lee

apcslee@cityu.edu.hk

Nano-Micro Letters, Vol. 14 (2022), Article Number: 14

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.


Highlights:


1 By using a zinc ion-chelated polyethylenimine as electron injection layer, an inverted organic light-emitting device (OLED) was successfully prepared with an external quantum efficiency over 10% at a brightness of 45,610 cd m−2.
2 The chelation between zinc ion and amine groups not only passivates polar amine groups, but also fuses separated electronic orbitals.
3 The inverted OLED show an excellent air stability with an operating time of 541 h @ 1,000 cd m−2 without any protection.

Keywords

Air stability Ultrabright Electron injection Metal ion chelation Inverted organic light-emitting device
Liu, Shihao, Chunxiu Zang, Jiaming Zhang, Shuang Tian, Yan Wu, Dong Shen, Letian Zhang, Wenfa Xie, and Chun‑Sing Lee. 2021. “Air-Stable Ultrabright Inverted Organic Light-Emitting Devices With Metal Ion-Chelated Polymer Injection Layer”. Nano-Micro Letters 14 (December):14. https://doi.org/10.1007/s40820-021-00745-w.
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