Iridium complex, preparation method of iridium complex and organic electroluminescence device using iridium complex

Abstract

The invention relates to one type of iridium complex, a preparation method of the iridium complex and an organic electroluminescence device using the iridium complex. The series of iridium complex molecule comprises two benzene dipyridine derivatives serving as main ligands and auxiliary ligands containing nitrogen heterocycle phosphoric acid structures. Compared with the iridium complex which has been widely researched and reported, the type of novel iridium complex covered by the invention has the advantages of high light emitting efficiency, stable chemical property and high possibility of sublimation and purification; meanwhile, due to the introduction of strong electron phosphoric acid ligand structures, the light emitting color of the complex can be effectively regulated; by modifying the molecule structures of the main ligands and the auxiliary ligands, the light emitting position of the complex in the blue light wavelength range can be adjusted, so that the convenience is brought to design and production of organic electroluminescence displays and lighting sources; meanwhile, the series of novel iridium complex introduced by the invention is simple in synthesis method, high in yield and flexible in chemical modification on the main ligands and the auxiliary ligands.

Description

【Technical Field】 [0001] The present invention relates to the technical field of organic electroluminescence devices, in particular to a type of iridium complexes, a preparation method thereof, and organic electroluminescence devices using the iridium complexes. 【Background technique】 [0002] Against the background of increasing global energy demand and the worrying ecological environment, governments of various countries have vigorously developed high-tech-based sustainable energy-saving technologies and industries. Organic electroluminescent devices (OLEDs) have attracted much attention due to their wide viewing angles, high brightness, low energy consumption and many advantages such as flexible devices. They are 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 to be the most ideal choice for phosphorescent materials for OLEDs. Ha...

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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