Patent ID: 11950497
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC H  C  Y | IPC C  H

Claim 21:
22. A light-emitting element comprising:
a light-emitting layer between a pair of electrodes, the light-emitting layer comprising:
a first material capable of converting triplet excitation energy into light emission; and
a second material capable of converting singlet excitation energy into light emission,
wherein the second material comprises a luminophore and five or more protecting groups,
wherein the luminophore is a condensed aromatic ring or a condensed heteroaromatic ring,
wherein each of the five or more protecting groups independently comprises any one of an alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, and a trialkylsilyl group having 3 to 12 carbon atoms,
wherein light emission is obtained from the second material,
wherein the first material comprises a compound emitting phosphorescence, and
wherein a T1 level of the second material is lower than a T1 level of the first material.