Organic light emitting material and organic light emitting diode (OLED) device

Abstract

The invention relates to the technical field of organic electroluminescent devices, and discloses an organic light emitting material and an organic light emitting diode (OLED) device comprising the same. The organic light emitting material has a structure represented by the formula (D). The material is used as the light emitting material of an organic light emitting diode, has a TADF function anda light extraction function at the same time, and is a guest material with a balanced hole transfer and electron transfer performance. More importantly, the organic light emitting material does not contain any functional group such as carbazole, triphenyl amine, or the like; thus the stability of the material is good, and avoided are the situations that the chemical bonds are broken, material aging happens, and the device performance deteriorates quickly during the long term using process of OLED devices.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to an organic light-emitting material and an organic light-emitting diode device. Background technique [0002] Organic electroluminescent device (OLED) emerged as a new generation of flat panel display technology and gradually entered people's field of vision. The initial OLED structure is very simple, that is, anode / luminescent layer (including a light-emitting material) EML / cathode. The device performance of this simple structure is poor, the required start-up voltage is high, and the luminous efficiency is low. Since then, various device structures have been proposed one after another. For example, the basic device structure of the current OLED is: anode / hole injection layer HIL / hole transport layer HTL / EML light emitting layer (host-guest doping system) / ETL electron transport layer / Electron injection layer EIL / cathode. In such a multi-layer device ...

AI Technical Summary

Problems solved by technology

Many current TADF material designs, in order to achieve the purpose of HOMO-LUMO separation, must use organic functional groups containing carbazole or triphenylamine or C-N bonds as organic groups for transporting holes or forming HOMO. However, these groups group is very easy to cause the aging of subsequent OLED devices

[0004] In addition, in order to improve the light extraction effect of the current OLED devices based on TADF materials, it is necessary to use light extraction technology, that is, to attach light extraction materials to the outside of the device, which also increases the production cost of OLED devices.

Images