A kind of organic compound and its preparation method and application

Abstract

The invention provides an organic compound and its preparation method and application. The organic compound has a structure shown in formula I. The organic compound has a high thermal decomposition temperature, a high triplet energy level, and a relatively small energy level difference between HOMO and LUMO. The HOMO and LUMO energy levels of small, specific-structured compounds match the hole-transport layer and the electron-transport layer. At the same time, the specific three-dimensional configuration prevents molecular stacking of material molecules, which reduces the annihilation due to the existence of high-energy excitons and improves Energy transfer efficiency, improve luminous efficiency, reduce driving voltage, have high luminous stability, effectively reduce color shift, and high thermal decomposition temperature, have high thermal stability, improve luminous efficiency and luminous performance of the device.

Description

technical field [0001] The invention belongs to the technical field of organic photoelectric materials, and relates to an organic compound and its preparation method and application. Background technique [0002] Compared with traditional technologies, OLED devices have many advantages such as low driving voltage, high luminous efficiency, high contrast, high color saturation, wide viewing angle and fast response time. Today's OLED devices include multiple layers of hole injection layer, hole transport layer, light emitting layer, hole blocking layer, electron transport layer and electron injection layer, and are matched with suitable electrodes. These layers are composed of the following materials: Hole injection materials, hole transport materials, luminescent materials, hole blocking materials, electron transport materials and electron injection materials. Among them, the OLED light-emitting layer made by doping has advantages in the luminous efficiency of the device, so ...

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Problems solved by technology

[0003] CBP, the structural formula is It is a widely used host material with good hole transport properties. However, when CBP is used as a host material, due to the low glass transition temperature of CBP, it is easy to recrystallize, resulting in a decrease in the performance and luminous efficiency of OLED devices.

On the other hand, CBP is a hole-type host material, the transport of electrons and holes is unbalanced, the recombination efficiency of excitons is low, the light-emitting area is not ideal, and the roll-off phenomenon of the device is serious during operation, which leads to the Low efficiency of energy transfer from host material to guest material reduces device efficiency

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