Iridium complex and preparation method and application thereof

Abstract

The invention provides an iridium complex and a preparation method thereof. The iridium complex uses aromatic ring and nitrogen heterocycle as a first main ligand and azo-heterocyclic phosphate as a second main ligand; in the aromatic ring and nitrogen heterocycle of the first main ligand, Ar is substituted phenyl ring, substituent is F, CF3 or CN, and N is pyridyl; in the azo-heterocyclic phosphate of the second main ligand, R is aryl or pyridyl, substituent is F or CF3, and N is pyridyl. The iridium complex is prepared by mixing iridium dimer bridged complex, azo-heterocyclic phosphate and an alkali carbonate as materials, adding 2-ethoxyethanol solution to a mixture and thermally reacting. The iridium complex of the invention is simple to prepare, high in yield and applicable to the preparation of organic electroluminescent devices.

Description

【Technical Field】 [0001] The present invention relates to the technical field of organic electroluminescence devices, in particular to a class of iridium complexes and preparation methods and applications thereof. 【Background technique】 [0002] Against the background of increasing global energy demand and the worrying ecological environment, governments of various countries have vigorously developed sustainable energy-saving technologies and industries based on high-tech. Organic electroluminescent device (OLED s ) Has attracted much attention because of its wide viewing angle, high brightness, low energy consumption and many advantages such as flexible devices, and it is called the key technology that will dominate the future display world. In recent years, a large number of studies have shown that among many heavy metal complexes, iridium complexes are considered as OLEDs. s The best choice for phosphorescent materials. The iridium atom with 5d76s2 outer electronic structure ...

AI Technical Summary

Problems solved by technology

Studies have shown that with the increase of the triplet energy level, the rate of both radiative transition and non-radiative transition will increase, and the increase of the latter is often more obvious, resulting in a decrease in luminous efficiency. Therefore, the blue shift of the emission wavelength and the high The internal quantum efficiency is in a contradictory relationship, which adds difficulty to the development of blue light compounds

In addition, blue light compounds with shorter emission wavelengths have lower luminous efficiencies

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