Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll‐Off Fabricated from Aggregation‐Induced Delayed Fluorescence Luminogens

Jian Huang(South China University of Technology), Han Nie(South China University of Technology), Jiajie Zeng(South China University of Technology), Zeyan Zhuang(South China University of Technology), Shifeng Gan(South China University of Technology), Yuanjing Cai(South China University of Technology), Jingjing Guo(South China University of Technology), Shi‐Jian Su(South China University of Technology), Zujin Zhao(South China University of Technology), Ben Zhong Tang(Hong Kong University of Science and Technology)
Angewandte Chemie International Edition
August 22, 2017
10.1002/anie.201706752
Cited by 383

Abstract

Abstract Purely organic emitters that can efficiently utilize triplet excitons are highly desired to cut the cost of organic light‐emitting diodes (OLEDs), but most of them require complicated doping techniques for their fabrication and suffer from severe efficiency roll‐off. Herein, we developed novel luminogens with weak emission and negligible delayed fluorescence in solution but strong emission with prominent delayed components upon aggregate formation, giving rise to aggregation‐induced delayed fluorescence (AIDF). The concentration‐caused emission quenching and exciton annihilation are well‐suppressed, which leads to high emission efficiencies and efficient exciton utilization in neat films. Their nondoped OLEDs provide excellent electroluminescence efficiencies of 59.1 cd A −1 , 65.7 lm W −1 , and 18.4 %, and a negligible current efficiency roll‐off of 1.2 % at 1000 cd m −2 . Exploring AIDF luminogens for the construction of nondoped OLEDs could be a promising strategy to advance device efficiency and stability.

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