Liu Shihao, Zang Chunxiu, Zhang Jiaming, Tian Shuang, Wu Yan, Shen Dong, Zhang Letian, Xie Wenfa, Lee Chun-Sing
State Key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China.
Nanomicro Lett. 2021 Dec 6;14(1):14. doi: 10.1007/s40820-021-00745-w.
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 and can deliver a maximum brightness of 121,865 cd m. 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 without any protection nor encapsulation.
在此，这项工作展示了一种通过使用锌离子螯合聚乙烯亚胺（PEI）作为电子注入层的空气稳定型超亮倒置有机发光器件（OLED）。锌螯合被证明可使PEI的电导率提高三个数量级，并钝化极性胺基团。凭借这些物理化学性质，该倒置OLED在45,610 cd m的高亮度下显示出创纪录的10.0%的外量子效率，并且可以提供121,865 cd m的最大亮度。此外，该倒置OLED还被证明具有出色的空气稳定性（湿度35%），在1000 cd m的亮度下，半亮度工作时间为541小时，无需任何保护或封装。
