具有分子间电荷转移效应的D-σ-A型热激活延迟荧光材料及其电致发光性能

doi:10.11896/cldb.22010216

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Abstract Three D-σ-A type thermally activated delayed fluorescent (TADF) materials, AQOPCZ, AQOPDPA and AQOPDMAC, were designed and synthesized using C-O σ bond connecting acceptor and donor. All of the materials possess tiny ΔE_ST (＜0.1 eV), distinct TADF characteristics and limited overlap of the molecular frontier orbitals because of the C-O σ bond and the distorted molecular structure. Compared with common TADF materials, these materials hardly have intramolecular charge transition (intra-CT) effect, but own outstanding intermolecular charge transition (inter-CT) effect. Due to inter-CT effect, three materials show long-wavelength emission (580—652 nm) in non-doped film. The fluorescence spectra of three materials in non-doped film exhibit remarkable red-shift compared with that in the solution (552—574 nm). Among three devices based on these emitters, the device employing AQOPCZ achieved best performance with maximum external quantum efficiencies of 6.07% and maximum luminance of 8 320 cd·m^-2. This work enriched the kind of D-σ-A type TADF materials and the preparation methods of long-wavelength TADF materials.

Key words： organic light-emitting diodes thermally activated delayed fluorescence intermolecular charge transition electroluminescence

Published: 25 July 2023 Online: 2023-07-24

CLC number:

O621.22

Fund:National Natural Science Foundation of China (21905048).

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	Articles by authors
	YAO Jingfeng
	LI Haoze
	WU Ping
	XIE Fengming
	HU Yingyuan
	ZHAO Xin

Cite this article:

YAO Jingfeng,LI Haoze,WU Ping, et al. D-σ-A Type Thermally Activated Delayed Fluorescent Emitters with Intermolecular Charge Transition Effect and Its Electroluminescence Properties[J]. Materials Reports, 2023, 37(14): 22010216-8.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22010216 OR http://www.mater-rep.com/EN/Y2023/V37/I14/22010216

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