Iridium complex and its preparation method and light-emitting device using the iridium complex

Abstract

The invention relates to an iridium complex, which comprises a main ligand containing two 2,4-difluorophenylpyridine derivatives and an auxiliary ligand of nitrogen-containing heterocyclic phosphoric acid. Compared with the iridium complexes that have been extensively researched and reported, the novel iridium complexes covered by this invention not only have the advantages of high luminous efficiency, stable chemical properties, and easy sublimation and purification, but also due to the introduction of a strong electron phosphoric acid coordination structure , which can effectively control the emission color of the complex. By modifying the molecular structure of the main ligand and the auxiliary ligand, the light-emitting position of the complex can be adjusted in the blue light wavelength range, which provides convenience for the design and production of organic electroluminescent displays and lighting sources. At the same time, the synthesis method of a series of novel iridium complexes introduced in the present invention is simple, the yield is high, and the chemical modification for the main ligand and auxiliary ligand is flexible.

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 light-emitting 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. Has 5d 7 6s 2 T...

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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