Light-Emitting Device and Electronic Appliance Using the Same

摘要

The light emitting element includes a first electrode and a second electrode, between which a light emitting layer, a hole transporting layer provide in contact with the light emitting layer, an electron transporting layer provided in contact with the light emitting layer, and a mixed layer provided between the electron transporting layer and the second electrode. The mixed layer includes an electron transporting substance and a substance showing an electron donating property with respect to the electron transporting substance. The light emitting layer includes an organometallic complex represented in General Formula (1) and a host. R1 and R2 each represent an electron-withdrawing substituent group. R3 and R4 each represent any of hydrogen or an alkyl group having 1 to 4 carbon atoms. L represents any of a monoanionic ligand having a beta-diketone structure, a monoanionic bidentate chelating ligand having a carboxyl group, or a monoanionic bidentate chelating ligand having a phenolic hydroxyl group.;

主权项

1. A light emitting device comprising:
a light emitting layer between a first electrode and a second electrode; a hole transporting layer between the first electrode and the light emitting layer wherein the hole transporting layer contacts with the light emitting layer; an electron transporting layer between the second electrode and the light emitting layer wherein the electron transporting layer contacts with the light emitting layer; and a mixed layer between the electron transporting layer and the second electrode wherein the mixed layer includes an electron transporting substance and a substance showing an electron donating property with respect to the electron transporting substance, wherein the light emitting layer includes an organometallic complex represented in General Formula (1) and a host,and
wherein R and R each represent an electron-withdrawing group, R3 and R4 each represent any one of hydrogen or an alkyl group having 1 to 4 carbon atoms, L represents a monoanionic ligand.