Patent ID: 11903227
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: nan (nan)
Classification: CPC H  Y | IPC H

Claim 0:
1. A light-emitting device emitting green light, comprising:
a pair of electrodes over a substrate; and
a light-emitting layer between the pair of electrodes,
wherein the light-emitting layer comprises:
a fluorescent material as a guest material; and
an organic compound as a host material,
wherein the fluorescent material comprises at least two branched alkyl groups each having 3 to 10 carbon atoms, at least two cyclic hydrocarbon groups each having 3 to 10 carbon atoms, or at least two bridged cyclic hydrocarbon groups each having 3 to 10 carbon atoms,
wherein an emission peak of the organic compound overlaps with an absorption band of the fluorescent material on the lowest energy side, and
wherein the organic compound is a thermally activated delayed fluorescence (TADF) material.