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

Claim 0:
1. 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 an emission spectrum of the first material overlaps with an absorption band on the longest wavelength side of an absorption spectrum of the second material, and
wherein a T1 level of the second material is lower than a T1 level of the first material.