Organometallic complex, light-emitting element, light-emitting device, electronic device, and lighting device

1. A light-emitting element comprising a light-emitting layer,

wherein the light-emitting layer comprises a first organic compound, a second organic compound, and an organometallic complex,

wherein the organometallic complex comprises a metal and a first ligand,

wherein the first ligand comprises a 5H-pyrimido[5,4-b]indole skeleton and an aryl group bonded to a 4-position of the 5H-pyrimido[5,4-b]indole skeleton,

wherein the metal is iridium or platinum,

wherein a 3-position of the 5H-pyrimido [5,4-b]indole skeleton and the aryl group are bonded to the metal, and

wherein a 5-position of the 5H-pyrimido[5,4-b]indole skeleton is bonded to an ethyl groups, and wherein the aryl group is a substituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted fluorenyl group.

2. The light-emitting element according to claim 1 ,

wherein the organometallic complex further comprises a second ligand,

wherein the second ligand is a monoanionic bidentate chelate ligand comprising a β-diketone structure, a carboxyl group, a phenolic hydroxyl group, or a structure in which two coordinating elements are both nitrogen, and

wherein the second ligand is bonded to the metal.

3. A light-emitting element comprising a light-emitting layer,

wherein:

the light-emitting layer comprises a first organic compound, a second organic compound, and an organometallic complex comprising a structure represented by a general formula (G1):

M represents iridium or platinum;

Ar represents a substituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted fluorenyl group;

each of R 1 to R 5 independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms; and

R 6 represents an ethyl group.

4. A light-emitting element comprising a light-emitting layer,

wherein:

the light-emitting layer comprises a first organic compound, a second organic compound, and an organometallic complex represented by a general formula (G2):

M represents iridium or platinum;

L represents a monoanionic ligand;

Ar represents a substituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted fluorenyl group;

each of R 1 to R 5 independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms;

R 6 represents an ethyl group;

when M represents iridium, m is 3 and n is 2 or 3; and

when M represents platinum, m is 2 and n is 1 or 2.

5. The light-emitting element according to claim 4 ,

wherein the monoanionic ligand is a monoanionic bidentate chelate ligand comprising a β-diketone structure, a monoanionic bidentate chelate ligand comprising a carboxyl group, a monoanionic bidentate chelate ligand comprising a phenolic hydroxyl group, or a monoanionic bidentate chelate ligand in which two coordinating elements are both nitrogen.

6. The light-emitting element according to claim 4 ,

wherein:

the monoanionic ligand is represented by a general foimulae (L1);

each of R 71 to R 73 independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a halogen group, a vinyl group, a substituted or unsubstituted haloalkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms, or a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms.

7. The light-emitting element according to claim 4 ,

wherein:

the organometallic complex is represented by a general formula (G3); and

each of R 7 and R 8 independently represents hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.

8. The light-emitting element according to claim 4 ,

wherein

the organometallic complex is represented by a general formula (G4),

9. The light-emitting element according to claim 4 , wherein the organometallic complex is represented by a structural formula (100),

10. The light-emitting element according to claim 4 , wherein the organometallic complex is represented by a structural formula (127),

11. The light-emitting element according to claim 4 ,

wherein the first organic compound is a carbazole derivative.

12. A light-emitting device comprising:

the light-emitting element according to claim 4 ; and

a transistor or a substrate.

13. An electronic device comprising:

the light-emitting device according to claim 12 ; and

a microphone, a camera, an operation button, an external connection portion, or a speaker.

14. A lighting device comprising:

the light-emitting device according to claim 12 ; and

a housing, a cover, or a support.

15. The light-emitting element according to claim 1 , wherein the first organic compound is a carbazole derivative.

16. The light-emitting element according to claim 3 , wherein the first organic compound is a carbazole derivative.

17. A light-emitting element comprising an organometallic complex,

wherein the organometallic complex comprises a metal and a first ligand,

wherein the first ligand comprises a 5H-pyrimido[5,4-b]indole skeleton and an aryl group bonded to a 4-position of the 5H-pyrimido[5,4-b]indole skeleton,

wherein the metal is iridium or platinum,

wherein a 3-position of the 5H-pyrimido[5,4-b]indole skeleton and the aryl group are bonded to the metal,

wherein a 5-position of the 5H-pyrimido[5,4-b]indole skeleton is bonded to an ethyl group, and

wherein the aryl group is a substituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted fluorenyl group.

18. The light-emitting element according to claim 17 ,

wherein the organometallic complex further comprises a second ligand,

wherein the second ligand is a monoanionic bidentate chelate ligand comprising a β-diketone structure, a carboxyl group, a phenolic hydroxyl group, or a structure in which two coordinating elements are both nitrogen, and

wherein the second ligand is bonded to the metal.