Iridium complex and preparation method thereof and luminous device using iridium complex

Abstract

The invention relates to an iridium complex with a novel coordination mode and taking nitrogen heterocyclic ring phosphoric acid as an auxiliary ligand. The series of iridium complexes contains two 2,4-difluoropyridine dipyridyl derivatives serving as main ligands and an auxiliary main ligand with a nitrogen heterocyclic ring phosphoric acid structure. Compared with the widely studied and reported iridium complexes, the novel iridium complex provided by the invention has the advantages of high luminous efficiency, stable chemical properties, easiness in sublimation and purification and the like; and moreover, due to the introduction of a strong-ligand field phosphoryl structure, the emitting color of the complex can be effectively controlled. By modifying the molecular structures of the main ligand and auxiliary ligand, the light emitting position of the complex can be adjusted within the wavelength range of blue light, thereby facilitating the design and production of organic electroluminescence displays and lighting sources. Meanwhile, according to the series of novel iridium complexes provided by the invention, the synthesis method is simple, the yield is relatively high, and the chemical modification of the main ligand and auxiliary ligand is flexible.

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 a light-emitting 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 for OLEDs. wit...

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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