Organic electroluminescence device, preparation method thereof and display apparatus

Abstract

An organic electroluminescence device and a display apparatus, where the organic electroluminescence device includes an organic light emitting layer which includes a host material, a sensitizer material, and a resonance thermally activated delayed fluorescent material, where the host material is a wide bandgap material, and the sensitizer material is an exciplex material, a singlet state energy level for the wide bandgap material is greater than a singlet state energy level for the exciplex, and a triplet state energy level for the wide bandgap material is greater than a triplet state energy level for the exciplex, and a singlet state energy level for the exciplex material is greater than a singlet state energy level for the resonance delayed fluorescent material, and a triplet state energy level for the exciplex material is greater than a triplet state energy level for the resonance delayed fluorescent material.

Dependencies are inferred from the claim text.