Dicyanoimidazole-based organic small molecule fluorophores: Synthesis and luminescent properties

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2024-08-22 DOI:10.1016/j.dyepig.2024.112417

引用次数: 0

Abstract

Four new organic D-π-A fluorophores consisting of different electron donors (carbazole and diphenylamine) and acceptors (4,5-dicyanoimidazole and 5,6-dicyanobenzo[d]imidazole), i.e., DCI-Cz, DCI-TPA, DCBI-Cz and DCBI-TPA, were synthesized to obtain deep-blue organic light-emitting diodes (OLEDs). These compounds exhibited good solubility and excellent thermal stability as well as strong deep-blue and blue emission in solution and solid states. With mCP (1,3-di(9H-carbazol-9-yl)benzene) as the host material, the doped devices with a configuration of ITO/PEDOT:PSS (30 nm)/mCP:dopant (x wt%) (25 nm)/TPBi (35 nm)/Liq (2 nm)/Al (150 nm) were fabricated by solution-processing the emitting layers to evaluate their electroluminescence (EL) performances. The devices using the blend of mCP with DCI-TPA as emitting layers exhibited the best electroluminescent performance with a maximum external quantum efficiency (EQE_max) of 4.39 % and a maximum current efficiency of 3.04 cd/A.

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基于二氰基咪唑的有机小分子荧光团：合成与发光特性

合成了四种由不同电子供体（咔唑和二苯胺）和受体（4,5-二氰基咪唑和 5,6-二氰基苯并[d]咪唑）组成的新型有机 D-π-A 荧光体，即 DCI-Cz、DCI-TPA、DCBI-Cz 和 DCBI-TPA，以获得深蓝色有机发光二极管（OLED）。这些化合物具有良好的溶解性和优异的热稳定性，并在溶液和固体状态下具有强烈的深蓝色和蓝色发射。以 mCP（1,3-di(9H-咔唑-9-基)苯）为宿主材料，通过溶液处理发光层，制备了掺杂 ITO/PEDOT:PSS (30 nm)/mCP:dopant (x wt%) (25 nm)/TPBi (35 nm)/Liq (2 nm)/Al (150 nm) 配置的器件，以评估其电致发光（EL）性能。使用 mCP 与 DCI-TPA 的混合物作为发光层的器件表现出最佳的电致发光性能，最大外部量子效率 (EQEmax) 为 4.39 %，最大电流效率为 3.04 cd/A。

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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.