Organometallic complex, light-emitting element, light-emitting device, electronic device, and lighting device
A novel substance capable of emitting phosphorescence is provided. An organometallic complex represented by General Fomulae (G3) or (G5). In the formulae, M represents iridium, platinum, palladium, or rhodium, R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.
1. A compound comprising a structure represented by a formula (G1):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; and
M represents a metal.
2. The compound according to claim 1 , wherein the metal is selected from iridium, platinum, palladium, and rhodium.
3. The compound according to claim 1 , wherein the structure is represented by a formula (G2):
4. A compound represented by a formula (G3):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms;
M represents a metal; and
L represents a monoanionic ligand,
wherein:
the metal is selected from iridium, platinum, palladium, and rhodium;
when M represents iridium or rhodium, n is 2; and
when M represents platinum or palladium, n is 1.
5. The compound according to claim 4 , wherein the compound is represented by a formula (G4):
6. The compound according to claim 4 , wherein the monoanionic ligand is a monoanionic bidentate chelate ligand with a beta-diketone structure or a monoanionic bidentate chelate ligand in which two coordinating elements are both nitrogen.
7. The compound according to claim 6 ,
wherein:
the monoanionic ligand is represented by a formula (L1) or (L2):
R 11 to R 17 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms;
A 1 to A 3 separately represent nitrogen or carbon bonded to hydrogen or a substituent R; and
the substituent R represents an alkyl group having 1 to 6 carbon atoms or a phenyl group.
8. A compound represented by a formula (G5):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; and
M represents a metal,
wherein:
the metal is selected from iridium, platinum, palladium, and rhodium;
when M represents iridium or rhodium, n is 2; and
when M represents platinum or palladium, n is 1.
9. The compound according to claim 8 , wherein the compound is represented by a formula (G6):
10. A light-emitting device comprising:
a light emitting layer between a pair of electrodes, the light emitting layer comprising a compound comprising a structure represented by a formula (G1):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; and
M represents a metal.
11. The light-emitting device according to claim 10 , wherein the metal is selected from iridium, platinum, palladium, and rhodium.
12. The light-emitting device according to claim 10 , wherein the structure is represented by a formula (G2):
13. A light-emitting device comprising:
a light emitting layer between a pair of electrodes, the light emitting layer comprising a compound represented by a formula (G3):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms;
M represents a metal; and
L represents a monoanionic ligand,
wherein:
the metal is selected from iridium, platinum, palladium, and rhodium;
when M represents iridium or rhodium, n is 2; and
when M represents platinum or palladium, n is 1.
14. The light-emitting device according to claim 13 , wherein the compound is represented by a formula (G4):
15. The light-emitting device according to claim 13 , wherein the monoanionic ligand is a monoanionic bidentate chelate ligand with a beta-diketone structure or a monoanionic bidentate chelate ligand in which two coordinating elements are both nitrogen.
16. The light-emitting device according to claim 15 ,
wherein:
the monoanionic ligand is represented by a formula (L1) or (L2):
R 11 to R 17 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms;
A 1 to A 3 separately represent nitrogen or carbon bonded to hydrogen or a substituent R; and
the substituent R represents an alkyl group having 1 to 6 carbon atoms or a phenyl group.
17. A light-emitting device comprising:
a light emitting layer between a pair of electrodes, the light emitting layer comprising a compound represented by a formula (G5):
R 1 represents 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 2 to R 7 separately represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; and
M represents a metal,
wherein:
the metal is selected from iridium, platinum, palladium, and rhodium;
when M represents iridium or rhodium, n is 2; and
when M represents platinum or palladium, n is 1.
18. The light-emitting device according to claim 17 , wherein the compound is represented by a formula (G6):
19. An electronic appliance comprising the light-emitting device according to claim 10 .
20. A lighting device comprising the light-emitting device according to claim 10 .