Rational design of red iridophosphors based on 1-(6-methoxynaphthalene-2-yl)isoquinoline ligand for solution‐processed OLEDs

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2024-06-29 DOI:10.1016/j.dyepig.2024.112315

Lixiang Li , Zihao Zhang , Jiangyu Zhu , Rui Liu , Gan Zhang , Xinru Wang , Yongyang Gong , Song Guo , Guohua Xie , Yuanli Liu

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Abstract

Phosphorescent metal complexes find widespread application in organic light-emitting diodes (OLEDs), with iridium(III) complexes being particularly favored for their superior performance. Owing to the flexible modifications of both main and auxiliary ligands, the photophysical properties of iridium(III) complexes can be finely tuned. In this study, two red neutral iridium(III) complexes, designated as Ir1 and Ir2, are successfully synthesized and characterized. Various auxiliary ligands including acetylacetone and 2-picolinic acid are employed in combination with 1-(6-methoxynaphthalene-2-yl)isoquinoline as the cyclometalating ligand. Both complexes exhibit red emission, with Ir1 emitting at 631 nm and Ir2 at 615 nm. Furthermore, they demonstrated good solubility in common organic solvents, facilitating device fabrication via solution methods. Electroluminescent (EL) devices based on complexes Ir1 and Ir2 are further prepared using spin-coating method, achieving maximum external quantum efficiencies (EQEs) of 3.30 % and 4.52 %, respectively, and both devices exhibited bright red EL with CIE coordinates of (0.68, 0.32) and (0.66, 0.34), which were very close to the standard red coordinates of (0.67, 0.33).

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基于 1-(6-甲氧基萘-2-基)异喹啉配体的红色铱磷酸盐的合理设计，用于溶液法有机发光二极管

磷光金属络合物在有机发光二极管（OLED）中得到广泛应用，其中铱（III）络合物因其卓越的性能而尤其受到青睐。由于可以对主配体和辅助配体进行灵活的修饰，铱（III）配合物的光物理特性可以进行微调。本研究成功合成并表征了两种红色中性铱（III）配合物，分别命名为 Ir1 和 Ir2。研究采用了包括乙酰丙酮和 2-吡啶甲酸在内的多种辅助配体，并以 1-(6-甲氧基萘-2-基)异喹啉作为环化配体。这两种复合物都能发出红色光，其中 Ir1 的发射波长为 631 纳米，Ir2 的发射波长为 615 纳米。此外，它们在普通有机溶剂中具有良好的溶解性，有利于通过溶液方法制造器件。利用自旋涂层法进一步制备了基于 Ir1 和 Ir2 复合物的电致发光（EL）器件，其最大外部量子效率（EQE）分别为 3.30 % 和 4.52 %，而且这两种器件都呈现出明亮的红色 EL，其 CIE 坐标分别为 (0.68, 0.32) 和 (0.66, 0.34)，与标准红色坐标 (0.67, 0.33) 非常接近。

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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.