Thermally activated delayed fluorescence emitters with oxygen-bridged triarylborane acceptors for pure blue organic light emitting diodes

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2024-12-12 DOI:10.1016/j.dyepig.2024.112597

Hai-Xiao Jiang , Yue-Jian Yang , Shi-Jie Ge , Jian-Rong Wu , Qi Zheng , Aziz Khan , Zuo-Quan Jiang , Yan-Qiu Sun

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引用次数: 0

Abstract

Two donor-acceptor (D-A) type pure blue thermally activated delayed fluorescent (TADF) emitters have been synthesized by integrating two oxygen-bridged triarylborane acceptors with different phenyl rings substitution sites with 10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azetidine (PASi). These emitters successfully keep the rapid reverse intersystem crossing rates characteristic of D-A type TADF materials, while incorporating the short-range charge transfer (SRCT) properties of oxygen-bridged triarylborane acceptors to amplify non-radiative transition processes. Organic light-emitting diode (OLED) devices based on these pure blue emitters show that each maximum external quantum efficiency (EQE_max) of the pPhBO-PASi and mPhBO-PASi devices are 20.4 % and 15.3 %, respectively. More encouragingly, the efficiency roll-off of the device improves with the increase of doping concentration. This work provides a simple and feasible molecular design strategy to design pure blue TADF emitters.

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.