Aggregation-Induced Delayed Fluorescence Luminogens for Efficient Organic Light-Emitting Diodes

Jiajie Zeng; Jingjing Guo; Hao Liu; Jacky W Y Lam; Zujin Zhao; Shuming Chen; Ben Zhong Tang

doi:10.1002/asia.201801588

Aggregation-Induced Delayed Fluorescence Luminogens for Efficient Organic Light-Emitting Diodes

Chem Asian J. 2019 Mar 15;14(6):828-835. doi: 10.1002/asia.201801588. Epub 2018 Dec 10.

Authors

Jiajie Zeng¹, Jingjing Guo¹, Hao Liu¹, Jacky W Y Lam², Zujin Zhao¹, Shuming Chen³, Ben Zhong Tang^{1

2}

Affiliations

¹ State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou, 510640, China.
² Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Kowloon, Hong Kong, China.
³ Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen, Guangdong, 518055, China.

PMID: 30474231
DOI: 10.1002/asia.201801588

Abstract

Aggregation-induced delayed fluorescence (AIDF) can be regarded as a special case of aggregation-induced emission (AIE). Luminogens with AIDF can simultaneously emit strongly in solid state and fully utilize the singlet and triplet excitons in organic light-emitting diodes (OLEDs). In this work, two new AIDF luminogens, DMF-BP-DMAC and DPF-BP-DMAC, with an asymmetric D-A-D' structure, are designed and synthesized. The characteristics of both luminogens are systematically investigated, including single crystal structures, theoretical calculations, photophysical properties and thermal stabilities. Inspired by their AIDF nature, the green-emission non-doped OLEDs based on them are fabricated, which afford good electroluminescence performances, with low turn-on voltages of 2.8 V, high luminance of 52560 cd m^-2 , high efficiencies of up to 14.4 %, 42.3 cd A^-1 and 30.2 lm W^-1 , and very small efficiency roll-off. The results strongly indicate the bright future of non-doped OLEDs on the basis of robust AIDF luminogens.

Keywords: aggregation-induced emission; excitons; fluorescence; luminescence; organic light-emitting diodes.