Iridium complex and preparation method thereof, and organic electroluminescent device using iridium complex

Abstract

The invention relates to an iridium complex and a preparation method thereof, and an organic electroluminescent device using the iridium complex. Molecules of the serial iridium complex include two phenyl-linked pyridine derivatives as a main ligand and an auxiliary ligand containing azo-heterocyclic phosphate structure. Compared with iridium complexes already widely researched and reported, the novel iridium complex covered herein has the advantages such as high luminescent efficiency, chemical property stability and ease of sublimation purification; as intense electronic phosphate coordination structure is introduced, light color of the complex can be effectively controlled. By modifying molecular structures of the main ligand and auxiliary ligand, it is possible to regulate luminescent position of the complex in a blue ray wavelength range, and this facilitates the design and production of organic electroluminescent displays and lighting sources. Meanwhile, the serial novel iridium complex described herein is simple to synthesize, high in yield and is flexible in chemical modification for the main ligand and auxiliary ligand.

Description

【Technical field】 [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to a class of iridium complexes, a preparation method thereof and an organic electroluminescent device using the iridium complexes. 【Background technique】 [0002] Against the background of increasing global energy demand and worrying ecological environment, governments of various countries have vigorously developed sustainable energy-saving technologies and industries based on high technology. Organic electroluminescent devices (OLEDs) have attracted much attention because of their advantages such as wide viewing angle, high brightness, low energy consumption and flexible devices, and are known as the key technology that will dominate the future display world. In recent years, a large number of studies have shown that among many complexes of heavy metal elements, iridium complexes are considered to be the most ideal choice of phosphorescent materials fo...

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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