Patent ID: 11925041
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 guest material;
a first host material; and
a second host material,
wherein a LUMO level of the guest material is lower than a LUMO level of the first host material,
wherein an energy difference between the LUMO level of the guest material and a HOMO level of the guest material is larger than an energy difference between the LUMO level of the first host material and a HOMO level of the first host material,
wherein the guest material is configured to convert triplet excitation energy into light emission,
wherein the energy difference between the LUMO level of the guest material and the HOMO level of the guest material is larger than transition energy calculated from an absorption edge of an absorption spectrum of the guest material by 0.4 eV or more,
wherein a LUMO level of the second host material is higher than the LUMO level of the first host material and the guest material,
wherein a HOMO level of the second host material is lower than the HOMO level of the first host material,
wherein the first host material comprises a π-electron deficient heteroaromatic ring skeleton, and
wherein the first host material comprises at least one of a π-electron rich heteroaromatic ring skeleton and an aromatic amine skeleton.