CPC H10K 50/121 (2023.02) [H10K 50/14 (2023.02); H10K 50/16 (2023.02); H10K 85/615 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02)] | 24 Claims |
1. A light-emitting device comprising:
an anode;
a light-emitting layer over the anode, the light-emitting layer comprising a first substance and a phosphorescent substance;
an electron-transport layer over and in contact with the light-emitting layer, the electron-transport layer comprising a first organic compound;
a first layer over and in contact with the electron-transport layer, the first layer comprising a second organic compound; and
a cathode over the first layer,
wherein the first organic compound has an anthracene skeleton,
wherein at least two phenyl groups are bonded to the anthracene skeleton in the first organic compound,
wherein the second organic compound comprises a phenanthroline skeleton,
wherein the first organic compound has lower triplet excitation energy than the phosphorescent substance, and
wherein the first organic compound has a deeper LUMO level than the second organic compound.
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