Host-guest composition and organic electroluminescent element comprising same

Abstract

The invention belongs to the field of organic photoelectricity, particularly relates to a host-guest composition which comprises an iridium metal complex and an organic compound, and also describes an organic electroluminescent element using the composition as an organic functional layer. The structure of the organic compound is shown as a formula (I), and the structure of the iridium metal complex is shown as a formula (II); the difference value delta ST between the singlet state energy level S1 and the triplet state energy level T1 of the compound shown as the formula (I) of the organic compound is less than or equal to 0.35 electron volt; iridium metal complexes of Formula (II) and organic optoelectronic elements comprising them can be understood by referring to the specific description provided herein. The host-guest composition disclosed by the invention is applied to a light-emitting layer of an organic light-emitting diode, so that the current efficiency of a light-emitting element is improved, the driving voltage is obviously reduced, the service life is prolonged, and the host-guest composition has a good commercial prospect.

Description

technical field [0001] The invention belongs to the field of organic electroluminescence, and in particular relates to a host-guest composition of an iridium metal complex and an organic compound, and an organic electroluminescence element comprising the composition. Background technique [0002] As a new type of display technology, organic electroluminescent elements have self-illumination, wide viewing angle, low energy consumption, high efficiency, thinness, rich colors, fast response, wide applicable temperature range, low driving voltage, flexible, bendable and The unique advantages of transparent display panels and environmental friendliness can be applied to flat panel displays and new generation lighting, and can also be used as LCD backlight. [0003] Since its invention in the late 1980s, organic electroluminescent devices have been used in industries, such as display screens such as mobile phones, but the current OLED devices are restricted from wider application ...

AI Technical Summary

Problems solved by technology

[0003] Since its invention at the end of the 1980s, organic electroluminescent devices have been used in industries, such as display screens such as mobile phones, but the current OLED devices are restricted from wider application due to factors such as low efficiency and short service life, especially large screen display

At the same time, when the OLED device is operated with an applied voltage, it will generate Joule heat, which makes the organic material easy to crystallize and affects the life and efficiency of the device. Therefore, it is also necessary to develop stable and efficient organic electroluminescent materials.

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