Journal
NANO-MICRO LETTERS
Volume 14, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00745-w
Keywords
Air stability; Ultrabright; Electron injection; Metal ion chelation; Inverted organic light-emitting device
Funding
- Shanghai Jiao Tong University
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This work presents an air-stable ultrabright inverted OLED by using zinc ion-chelated polyethylenimine (PEI) as the electron injection layer, which shows record-high external quantum efficiency and excellent air stability.
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.
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