Patent ID: 11889711
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A light-emitting device comprising:
n light-emitting layers between an anode and a cathode, where n is a natural number greater than or equal to 2; and
a first hole-transport material, a first electron-transport material, a second electron-transport material, an acceptor material, and a donor material between the m-th light-emitting layer from the anode and the (m+1)-th light-emitting layer from the anode, where m is a natural number satisfying 1≤m≤n−1,
wherein a first region which comprises the first electron-transport material comprises the donor material,
wherein a second region which comprises the second electron-transport material does not comprise the donor material, and
wherein the first electron-transport material is a nitrogen-containing condensed aromatic compound.