Iridium complex, preparation method thereof and electroluminescent device by applying iridium complex

Abstract

The invention relates an iridium complex, a preparation method thereof and an iridium complex and an electroluminescent device by applying the iridium complex. The iridium complex has a novel main ligand and tetra-(4-fluorophenyl)phosphonimide as an auxiliary ligand, wherein the main ligand is (R-)4-pinene-2-phenylpyridine or (S-)4-pinene-2-phenylpyridine containing chiral pinene groups. Compared with an iridium complex which is widely researched and reported, the novel iridium complex has high illumination efficiency, has the advantages of small luminescence quenching effect, high electron mobility, stable chemical property, easy sublimation and purification and the like caused by the concentration factor, and has an excellent device performance. By modifying the molecular structure, the illumination intensity and efficiency of the complex can be regulated in the range of visible wavelength, so that convenience is brought for design and production of organic electroluminescent displays and lighting sources. Furthermore, a series of methods for synthesizing the novel iridium complex are simple, have high yield, and have flexible chemical modification for ligands.

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...

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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

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