Iridium complex, preparation method thereof and electroluminescent device applying same

Abstract

The invention relates to an iridium complex having novel main ligands and regarding 4 (4- trifluoromethyl phenyl) phosphine imide as an auxiliary ligand.The main ligands of the series of iridium complex molecules are 2-(4, 6-bistrifluoromethyl pyridine-3-) base pyridine, 2-(4, 6-bistrifluoromethyl pyridine-4-) base pyridine, 2-(4, 6-bistrifluoromethyl pyridine-3-) base pyrimidine, 2-(4, 6-bistrifluoromethyl pyridine-4-) base pyrimidine, 2-(4, 6-bistrifluoromethyl pyridine-3-) base pyrazine, 2-(4, 6-bistrifluoromethyl pyridine-4-) base pyrazine, 2-(4, 6-bistrifluoromethyl pyridine-3-) base triazine and a derivative of a 2-(4, 6-bistrifluoromethyl pyridine-4-) base triazine.According to the novel iridium complex, the molecular structures of the main ligands are modified, light emitting strength and efficiency of the complex can be adjusted within the green light wavelength range, and convenience is provided for design and production of an organic electroluminescent display and a lighting light source; meanwhile, a series of novel iridium complexes are simple in synthesis method, high in yield and flexible in chemical modification of the 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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