Light-Emitting Device

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• a light-emitting layer,
• wherein the light-emitting layer is between the first electrode and the second electrode,
• wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a phosphorescent light-emitting substance,
• wherein the first organic compound comprises a heteroaromatic ring skeleton and a substituent,
• wherein the substituent comprises a 1,1′:4′,1″-terphenyl skeleton,
• wherein the second organic compound comprises a bicarbazole skeleton, and
• wherein energy of a lowest triplet excited level of the second organic compound is higher than or equal to 2.20 eV and lower than or equal to 2.65 eV.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• a light-emitting layer,
• wherein the light-emitting layer is between the first electrode and the second electrode,
• wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a phosphorescent light-emitting substance,
• wherein the first organic compound comprises a heteroaromatic ring skeleton and a 1,1′:4′,1″-terphenyl group,
• wherein the second organic compound comprises a bicarbazole skeleton, and
• wherein energy of a lowest triplet excited level of the second organic compound is higher than or equal to 2.20 eV and lower than or equal to 2.65 eV.