Patent ID: 11889759
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A light-emitting element comprising:
an anode, a cathode, and an electroluminescence layer between the anode and the cathode,
wherein the electroluminescence layer comprises a light-emitting layer, a first electron-transport layer, and a second electron-transport layer,
wherein the first electron-transport layer is positioned between the light-emitting layer and the second electron-transport layer,
wherein the light-emitting layer comprises a region in contact with the first electron-transport layer,
wherein the second electron-transport layer comprises a region in contact with the first electron-transport layer,
wherein the light-emitting layer comprises a fluorescent substance and a host material,
wherein the first electron-transport layer comprises a first material,
wherein the second electron-transport layer comprises a second material,
wherein a LUMO level of the host material is higher than a LUMO level of the first material,
wherein a LUMO level of the second material is higher than the LUMO level of the first material,
wherein the host material is a substance having an anthracene skeleton,
wherein the first material is a substance comprising a triazine skeleton, and
wherein the second material is a substance comprising a phenanthroline skeleton, a bipyridine skeleton and a pyridine skeleton.