Electroluminescent compound, thermally activated delayed fluorescence material, and application thereof

Abstract

Provided are an electroluminescent compound having a structure represented by Formula I, a thermally activated delayed fluorescence material and an application thereof. The electroluminescent compound has TADF characteristics and may be applied to a light emitting layer of an OLED device as a thermally activated delayed fluorescence material. The OLED device includes an anode, a cathode, and at least one organic thin film layer comprising the thermally activated delayed fluorescence material in a light emitting layer between the anode and the cathode. The electroluminescent compound effectively reduces the overlap between HOMO and LUMO through special molecular structure design, so that ΔEST is reduced to less than 0.25 eV, which satisfies reverse crossing of energy from a triplet state to a singlet state, effectively improves transmission capacities of two kinds of carriers, improves carrier balance, and thus significantly improves light emitting efficiency of the OLED device.

Dependencies are inferred from the claim text.