Ether-mediated charge transfer modulation for deep-blue multi-resonance TADF emitters with enhanced reverse intersystem crossing

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-07-16 DOI:10.1016/j.dyepig.2025.113019

Yaozu Su , Guowei Chen , Jie Hu , Si-Wei Chen , Lu Zhou , Xiaofeng Tan , Jiacong Liu , Longjiang Xing , Jia-Ming Jin , Ruicheng Wang , Shangru Li , Wen-Cheng Chen , Shaomin Ji , Hao-Li Zhang , Yanping Huo

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引用次数: 0

Abstract

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials have garnered significant attention in the field of wide-color-gamut displays due to their high luminescent efficiency and narrowband emission characteristics. However, the development of deep-blue emitters that simultaneously achieve high efficiency and high color purity remains a critical challenge. In this work, we propose an ether-mediated long-range charge transfer strategy to develop two novel MR-TADF blue emitters, BNCz-OPh and BNCz-OTPA. By synergistically modulating the weak electron-donating effect of oxygen atom and the moderate electron-donating capability of triphenylamine groups, we achieved blue-shifted emission wavelengths and enhanced exciton utilization efficiency while maintaining narrowband emission. The ether bridge can accelerate the reverse intersystem crossing process through charge transfer, thereby optimizing exciton dynamics. The BNCz-OTPA-based OLED device exhibited narrowband emission with a full width at half maximum (FWHM) of 26 nm. Commission Internationale de l’Éclairage (CIE) coordinates of (0.118, 0.148), and a maximum external quantum efficiency (EQE) of 25.2 %. This work provides a new design strategy for high-performance narrowband blue organic light-emitting diodes with good color purity and efficiency.

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具有增强反向系统间交叉的深蓝色多共振TADF发射器的醚介导电荷转移调制

多共振热激活延迟荧光（MR-TADF）材料因其高发光效率和窄带发射特性在宽色域显示领域受到广泛关注。然而，同时实现高效率和高颜色纯度的深蓝发射器的开发仍然是一个关键的挑战。在这项工作中，我们提出了一种醚介导的远程电荷转移策略来开发两种新的MR-TADF蓝色发射器，BNCz-OPh和BNCz-OTPA。通过协同调节氧原子的弱给电子效应和三苯胺基团的中等给电子能力，在保持窄带发射的同时实现了发射波长的蓝移，提高了激子的利用效率。以太桥可以通过电荷转移加速系统间的反向穿越过程，从而优化激子动力学。基于bncz - otpa的OLED器件具有26 nm的全宽半峰（FWHM）窄带发射。国际委员会Éclairage （CIE）坐标为（0.118,0.148），最大外部量子效率（EQE）为25.2%。本工作为高性能窄带蓝色有机发光二极管提供了一种新的设计策略，具有良好的色纯度和效率。

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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.