Affiliation:
1. College of Physics and Electronic Information Engineering Zhejiang Normal University Jinhua Zhejiang 321004 China
2. Printable Electronics Research Center Nano Devices and Materials Division Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences Suzhou Jiangsu 215123 China
Abstract
AbstractSolution‐processed quantum‐dot light‐emitting diodes (QLEDs) have achieved huge successes in terms of both efficiency and stability. However, the polymeric hole transport materials (HTMs) utilized in QLEDs, to some degree, cause severe damages to performance consistency due to their intrinsic batch‐to‐batch problems. Thus, adopting small‐molecule HTMs with definitive chemical structures and molecular weight is a plausible way to solve this issue. In this work, a new solution‐processable small‐molecule (SM)‐HTM (FLCZ) is designed and synthesized, through elaborately modifying the widely used 4,4′‐bis(carbazole‐9‐yl)‐biphenyl via manipulating dipole moments, for solution‐processed QLEDs to replace polymeric HTMs. The FLCZ‐based QLED has achieved an external quantum efficiency (EQE) of 14.63% (18.74 lm W−1, 20.01 cd A−1), approaching that of polymer HTMs‐based QLEDs. In addition, the large surface energy of 45.29 mN m−1 is also observed on the film of FLCZ, which is highly desirable for inkjet‐printed (IJP) QLED devices, results in the IJP fabricated QLED with an EQE of 10.69%. To the best of knowledge, the results of this work represent the highest device performance of conventional solution‐processed QLED based on a single SM‐HTM.
Funder
China Postdoctoral Science Foundation
Natural Science Foundation of Jiangsu Province
Chinese Academy of Sciences
Subject
Industrial and Manufacturing Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献