Iridium complex as well as preparation method and electroluminescence device with iridium complex

Abstract

The invention relates to an iridium complex which comprises novel main ligand and 2-(5-phenyl-1,3,4-oxadiazole-2-)phenol or 2-(5-(3-pyridine)yl-1,3,4-oxadiazole-2-)phenol as auxiliary ligand, wherein the main ligand of the series of the iridium complex is any one of 2,3-diphenyl quinoxaline, 2,3-diphenyl pyridine[2,3-b]pyrazine, 2,3-diphenyl pyrazine[2,3-b]pyrazine, dibenzo[a,c]phenazine and dipyridino[3,2-a:2',3'-c]phenazine derivatives. The iridium complex provided by the invention has the advantages of being high in light emission efficiency, stable in chemical property, easy to sublimate and purify, and the like, and is excellent in device property. By modifying the molecular structure of the ligand, the light emission intensity and the light emission efficiency of the ligand can be adjusted within an infrared wavelength range, and thus convenience can be brought to design and production of electroluminescence displays and illumination light sources.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of organic electroluminescence devices, in particular to a class of iridium complexes, a preparation method thereof, and a light-emitting device using the iridium complexes. [0003] 【Background technique】 [0004] Under 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 due to their wide viewing angle, high brightness, low energy consumption, and the ability to fabricate flexible devices, and are known as key technologies that will dominate the display world in the future. 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...

AI Technical Summary

Problems solved by technology

In addition, in the current commonly used materials, the hole mobility of hole transport materials is much higher than that of electron transport materials, and the commonly used host materials are mainly hole transport, which will lead to a large number of redundant holes. Aggregation of holes at the interface between the light-emitting layer and the electron-transporting layer

These factors can lead to reduced efficiency and severe efficiency roll-off

Studies have shown that if the iridium complex has a high electron transport ability, it can effectively increase the transport and distribution of electrons in the light-emitting layer, broaden the electron-hole area, balance the number of electron-hole pairs, and greatly improve the device. efficiency, the reduced efficiency of the roll-off

Images