具有聚集诱导发光性质的热活化延迟荧光材料综述

doi:10.11896/cldb.20030026

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Abstract Organic light-emitting diodes (OLEDs) have attracted much attention in recent years. Among organic electroluminescent materials, thermally activated delayed fluorescent (TADF) materials, which could harvest both singlet and triplet excitons to afford internal quantumn efficiencies of 100%, are emerging as one of the third-generation organic electroluminescent materials. However, TADF materials have to suffer from aggregation-caused quenching (ACQ) effect, which results in reduced luminance efficiencies.
Aggregation-induced emission (AIE) materials have excellent emission efficiencies by suppressing concentration quenching. Therefore, a few of TADF materials with AIE characters have been reported. In this review, the research progress of OLED materials, the related mechanisms of TADF, TTA, HLCT and AIE, the design principles of TADF materials are briefly introduced. The paper specially focuses on the outputs of works on the photophysical performance improvement of TADF materials with AIE effect and relevant devices, in which carbonyl, diphenyl sulfone, triazine and other representative electron withdrawing groups are utilized as electron acceptors. In design concept of TADF materials with benzophenone substituents, asymmetric structures are adopted to construct TADF materials, which can enhance AIE characteristics of the molecules, and also reduce ΔE_ST values due to increased rigidity of the molecular. Compared with phenylsulfone groups considered as acceptors for TADF materials can form a larger torsion angle, which is more inclined to form AIE properties. Moreover, triazine units in TADF materials provide multiple grafting points for the combination with electron donors, and consequently, facilitate the adjustment of intramolecular deflection angle and energy level. The paper ends with a prospective discussion on the future trend of TADF materials with AIE properties, which is expected to provide a meaningful theoretical guidance for the design this type of novel materials.

Key words： aggregation-induced emission (AIE) thermally activated delayed fluorescent (TADF) efficiency organic light-emitting diode (OLED) non-doped

Published: 02 September 2020

CLC number:

O625

Fund:National Natural Science Foundation of China (51202073), the Natural Science Foundation of Fujian Province (2016J01233) and Graphene Powder & Composite Research Center of Fujian Province (2017H2001), Subsidized Project for Postgraduates' Innovative Fund in Scientific Research of Huaqiao University.

About author:: Siyu Zhao received her B.S. degree in Hainan Normal University in 2018. She is currently a master student in the Key Laboratory for Functional Materials of Fujian Higher Education, under the guidance of associate professor Qinghua Zhao. Her research has focused on design and synthesis of novel thermal activated delayed fluorescent materials.
Qinghua Zhao resceived her B.E. degree in chemical industry from Yan Bian University in 2001 and received her Ph.D. degree in polymer from Gyeongsang National University in 2008. After two years postdoctoral research in Gyeongsang National University, she is currently an associate professor in Huaqiao University. Her research interests are design and synthesis of organic light emitting materials for OLEDs. In recent years, she has published more than 10 papers in the field of organic optoelectronic materials, including Advanced Materials, Organic Electronics, Journal of Polymer Science Part A: Polymer Chemistry, RSC Advanced.

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	ZHAO Siyu
	ZHANG Xiang
	LU Ling
	ZHANG Yi
	ZHAO Qinghua

Cite this article:

ZHAO Siyu,ZHANG Xiang,LU Ling, et al. A Review on Thermally Activated Delayed Fluorescent Material with Aggregation-induced Emission Property[J]. Materials Reports, 2020, 34(17): 17155-17167.

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http://www.mater-rep.com/EN/10.11896/cldb.20030026 OR http://www.mater-rep.com/EN/Y2020/V34/I17/17155

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