Light-emitting element, light-emitting device, electronic device, lighting device, and heterocyclic compound
A light-emitting element with high heat resistance and high emission efficiency is provided. A novel heterocyclic compound that can be used in such a light-emitting element is provided. One embodiment of the present invention is a light-emitting element which includes, between a pair of electrodes, a layer containing a first organic compound, a second organic compound, and a light-emitting substance; the first organic compound includes one pyrimidine ring and one ring with a hole-transport skeleton; the second organic compound is an aromatic amine; and the light-emitting substance converts triplet excitation energy into light. A combination of the first organic compound, which includes the one pyrimidine ring and the one ring with the hole-transport skeleton, and the second organic compound, which is the aromatic amine, forms an exciplex.
1. A light-emitting element comprising an organic compound represented by a formula (G1):
wherein Ar 1 to Ar 3 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group,
wherein R 1 to R 3 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms,
wherein α represents a substituted or unsubstituted phenylene group,
wherein n is 2 or 3,
wherein Z represents oxygen or sulfur,
wherein the light-emitting element further comprises a layer between a pair of electrodes, the layer comprising:
the organic compound;
an aromatic amine; and
a phosphorescent compound, and
wherein a combination of the organic compound and the aromatic amine is configured to form an exciplex.
2. The light-emitting element according to claim 1 , wherein the organic compound is represented by a formula (G2):
3. The light-emitting element according to claim 1 , wherein the organic compound is represented by a formula (100):
4. The light-emitting element according to claim 1 , wherein the organic compound is represented by a formula (101):
5. The light-emitting element according to claim 1 , further comprising an electron-transport layer between the layer and one of the pair of electrodes, wherein the electron-transport layer comprises the organic compound.
6. A light-emitting device comprising the light-emitting element according to claim 1 .
7. An electronic device comprising the light-emitting device according to claim 6 .
8. A lighting device comprising the light-emitting device according to claim 6 .
9. A light-emitting element comprising:
a layer between a pair of electrodes, the layer comprising:
an organic compound comprising a pyrimidine ring;
an aromatic amine; and
a phosphorescent compound,
wherein a combination of the organic compound and the aromatic amine is configured to form an exciplex.
10. The light-emitting element according to claim 9 , wherein the organic compound further comprises a ring including a hole-transport skeleton.
11. The light-emitting element according to claim 9 , wherein the organic compound has a molecular weight greater than or equal to 400 and less than or equal to 1200.
12. The light-emitting element according to claim 10 , wherein the ring including the hole-transport skeleton is a carbazole ring, a dibenzothiophene ring, or a dibenzofuran ring.
13. The light-emitting element according to claim 9 , wherein the aromatic amine comprises a pyrimidine skeleton.
14. A light-emitting device comprising the light-emitting element according to claim 9 .
15. An electronic device comprising the light-emitting device according to claim 14 .
16. A lighting device comprising the light-emitting device according to claim 14 .