New sandwich-structured blue thermally activated delayed fluorescence molecules with through-space charge transfer effect

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-04-03 DOI:10.1016/j.dyepig.2025.112804

Ziyu Lan , Xiaobin Dong , Ruiqi Sun , Zuguo Yang , Ben Zhong Tang , Zujin Zhao

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引用次数: 0

Abstract

Efficient blue thermally activated delayed fluorescence (TADF) materials are highly desired for the development of organic light-emitting diodes (OLEDs) but remain challenge. This study reports the synthesis and characterization of two new blue TADF molecules (2CzTXT and 2PCzTXT) with a sandwich structure consisting of thioxanthone (TXT) donor, 9-phenylcarbazole (PCz) donors, and 3,6-di-tert-butyl-9H-carbazol (2tCz) bridge. The crystal configurations, thermal stability, electrochemical behaviors, electronic structures and photophysical properties are systematically studied by experimental measurements and theoretical calculations. Both molecules exhibit prominent through-space charge transfer (TSCT) feature and strong TADF in doped films with good quantum yields. The OLEDs using both molecules as emitters provide blue electroluminescence (EL) peaking at 470 and 490 nm with good external quantum efficiencies of 11.03 % and 8.58 %, respectively. The results acquired in this study should be conducive to the development of efficient blue TADF emitters based on TSCT effect.

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具有穿越空间电荷转移效应的新型三明治结构蓝色热激活延迟荧光分子

高效的蓝色热激活延迟荧光（TADF）材料是有机发光二极管（oled）发展的迫切需要，但仍然存在挑战。本研究报道了由噻唑酮（TXT）给体、9-苯基咔唑（PCz）给体和3,6-二叔丁基- 9h -咔唑（2tCz）桥组成的三明治结构的两个新的蓝色TADF分子（2CzTXT和2PCzTXT）的合成和表征。通过实验测量和理论计算，系统地研究了晶体构型、热稳定性、电化学行为、电子结构和光物理性质。这两种分子在掺杂膜中均表现出明显的通过空间电荷转移（TSCT）特征和强TADF，具有良好的量子产率。使用这两种分子作为发射体的oled在470 nm和490 nm处产生蓝色电致发光（EL）峰，外量子效率分别为11.03%和8.58%。本研究结果将有助于开发基于TSCT效应的高效蓝色TADF发射器。

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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.