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

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2025-04-01 Epub 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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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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纯蓝色有机发光二极管用氧桥接三羰基硼烷受体热激活延迟荧光发射器

将两个具有不同苯基环取代位点的氧桥接三芳基硼烷受体与10,10-二苯基-5,10-二氢二苯并[b，e][1,4]氮杂啶（PASi）结合，合成了两个供受体（D-A）型纯蓝色热激活延迟荧光（TADF）发射器。这些发射器成功地保持了D-A型TADF材料的快速反向系统间交叉速率特性，同时结合了氧桥接三羰基硼烷受体的短程电荷转移（SRCT）特性，以放大非辐射转变过程。基于这些纯蓝色发射器的有机发光二极管（OLED）器件表明，pPhBO-PASi和mPhBO-PASi器件的最大外量子效率（EQEmax）分别为20.4%和15.3%。更令人鼓舞的是，该装置的效率滚降随着掺杂浓度的增加而提高。本研究为纯蓝色TADF发射体的设计提供了一种简单可行的分子设计策略。

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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.