Patent ID: 11889712
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A light-emitting device comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer includes a light-emitting layer and an electron-transport layer,
wherein the light-emitting layer includes a light-emitting material,
wherein the electron-transport layer includes an organic compound having an electron-transport property and a metal complex of an alkali metal,
wherein the organic compound having the electron-transport property comprises a π-electron deficient heteroaromatic ring skeleton,
wherein an ordinary refractive index of the organic compound having the electron-transport property in a peak wavelength of light emitted from the light-emitting material is greater than or equal to 1.50 and less than or equal to 1.75, and
wherein an ordinary refractive index of the metal complex of the alkali metal in the peak wavelength of the light emitted from the light-emitting material is greater than or equal to 1.45 and less than or equal to 1.70.