Novel isocyanobenzene carbazole-based thermally activated delayed fluorophors towards solution-processed blue emitting OLED devices with high efficiency

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2024-11-05 DOI:10.1016/j.orgel.2024.107155

Yang Xiao , Tianyu Huang , Guimin Zhao , Wei Jiang , Dongdong Zhang , Lian Duan

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Abstract

Achieving efficient blue emission is an exigent challenge for the application of thermally activated delayed fluorescent organic light-emitting diodes (TADF-OLEDs). Carbazole benzonitrile-based TADF molecules exhibit promising performance in achieving the goal. Here, by replacing the cyano group in the sensitizer with the isocyano group, a 9 nm hypochromatic shift in photoluminescence spectra of the sensitizer and an enhanced efficiency of the Förster energy transfer (FET) in TADF-sensitized fluorescence (TSF) is found. By using the isocyano-based compounds as sensitizers, a maximum external quantum efficiency of 24.5 % is obtained in solution-processed OLEDs, surpassing the cyano-based counterparts with similar structures. Moreover, the full width at half maximum (FWHM) of the emitter in the electroluminescence spectrum is also decreased from 47 nm to 38 nm, indicating a more complete energy transfer.

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新型基于异氰苯咔唑的热激活延迟荧光团用于高效的溶液处理蓝色发光OLED器件

实现高效蓝光发射是热激活延迟荧光有机发光二极管（ttadf - oled）应用的迫切挑战。以咔唑苯并腈为基础的TADF分子在实现这一目标方面表现出良好的性能。在这里，通过用异氰基取代敏化剂中的氰基，发现敏化剂的光致发光光谱发生了9 nm的下色移，并提高了tadf敏化荧光（TSF）中Förster能量转移（FET）的效率。通过使用异氰基化合物作为增敏剂，在溶液处理的oled中获得了24.5%的最大外量子效率，超过了具有类似结构的氰基对应物。此外，电致发光光谱中发射极的半最大值全宽度（FWHM）也从47 nm减小到38 nm，表明能量传递更加完全。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.