THERMALLY ACTIVATED DELAYED FLUORESCENCE MATERIAL AND PREPARATION METHOD THEREFOR, AND ORGANIC LIGHT-EMITTING DIODE DEVICE

摘要

The present invention relates to a thermally activated delayed fluorescence (TADF) material and a preparation method therefor, and an organic light-emitting diode device. The structural general formula of the TADF material is as shown in the following formula I: (I), R representing a chemical group as an electron donor. The TADF material of the present invention has an ultrafast reverse intersystem crossing rate and high luminous efficiency, and is a blue TADF material having significant TADF characteristics and high energy level. According to the present invention, 100% internal quantum utilization efficiency of the TADF material is used, and the TADF material, as the main material of a conventional fluorescence material, is applied to an organic light-emitting diode device, so that a fluorescent device can achieve device efficiency comparable to the phosphorescent device of a phosphorescent heavy metal complex, thereby greatly improving the exciton utilization rate, and solving the problems such as poor color gamut and overlong exciton service life caused by directly using the TADF material as the material of a light-emitting layer.