Thermally activated delayed fluorescence material based on phthalonitrile for versatile applications as host and sensitizer in OLEDs

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-04-16 DOI:10.1016/j.dyepig.2025.112843

Yli Peng , Wenle Wang , Xinyu Li , Yuqin Du , Feng Wang , Kang Chen , Huixia Xu , Huijun Sun , Yanqin Miao , Hua Wang

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引用次数: 0

Abstract

To enhance and stabilize the performance of organic light emitting diodes (OLEDs), it is essential to design the host to converse dark triplet excitons to emissive singlet. Herein, we developed a host material with thermally activated delayed fluorescence (TADF) characteristics based on phthalonitrile and carbazole derivatives, namely Me-2CzPN. This TADF molecule derived from a typical TADF emitter of 2CzPN through featuring double methyls groups on 3- and 6- positions of carbazole. Me-2CzPN exhibits a high triplet energy of 2.47 eV and a large rate constant of reverse intersystem crossing (RISC), ensuring efficient energy transfer from host to guest, and improve the utilization of triplet exciton. Consequently, the corresponding blue TADF-OLED achieved a high maximum external quantum efficiency (

{E Q E}_{\max}

) of 20.8 %. When employed Me-2CzPN as a host material in red phosphorescent OLED, the device displayed an

{E Q E}_{\max}

of 12.4 %. Furthermore, Me-2CzPN was used sensitizer in hyperfluorescent OLEDs (HF-OLEDs), exhibiting an

{E Q E}_{\max}

of 7.1 % accompanied with full width at half maximum (FWHM) values of 34 nm. These findings reveal the versatile applications of Me-2CzPN as emitter, host and sensitizer for fluorescent emitters, respectively.

Abstract Image

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基于邻苯二腈的热激活延迟荧光材料在oled中作为宿主和敏化剂的广泛应用

为了提高和稳定有机发光二极管（oled）的性能，必须设计将暗三重态激子转换为发光单重态激子的宿主。在此，我们开发了一种基于邻苯二腈和咔唑衍生物的具有热激活延迟荧光（TADF）特性的宿主材料，即Me-2CzPN。该TADF分子来源于典型的2CzPN TADF发射器，通过在咔唑的3位和6位上具有双甲基。Me-2CzPN具有2.47 eV的高三重态能量和较大的反向系统间交叉速率常数（RISC），确保了主客体之间的高效能量传递，提高了三重态激子的利用率。因此，相应的蓝色TADF-OLED实现了20.8%的最高外部量子效率（EQEmax）。将Me-2CzPN作为主体材料应用于红色磷光OLED中，器件的EQEmax为12.4%。此外，Me-2CzPN在高荧光oled （hf - oled）中使用增敏剂，EQEmax为7.1%，半峰全宽（FWHM）值为34 nm。这些发现揭示了Me-2CzPN分别作为荧光发射体的发射体、宿主和敏化剂的广泛应用。

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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.