Organometallic complex, and light-emitting element and display device using the organometallic complex
Disclosed is an organometallic complex capable of variable phosphorescence characteristics and yellow emission at high luminance The organometallic complex has a structure represented by a formula (G6), where at least one of R 4 , R 5 , R 6 , and R 7 is a phenoxy group, M is a Group 9 metal or a Group 10 metal, and L is a monoanionic ligand.
1. An organometallic complex represented by a formula (G6),
wherein:
R 1 represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 1 to 5 carbon atoms, or a phenyl group;
R 2 and R 3 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or a phenyl group;
R 4 , R 5 , R 6 , and R 7 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, a trifluoromethyl group, and a phenyl group;
at least one of R 4 , R 5 , R 6 , and R 7 has a structure represented by a formula (G2):
M represents a Group 9 element or a Group 10 element;
L represents a monoanionic ligand;
n is 2 when M is a Group 9 element or 1 when M is a Group 10 element; and
R 8 , R 9 ,R 10 , R 11 , , R 12 and separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen , a trifluoromethyl group, or a phenyl group.
2. The organometallic complex according to claim 1 ,
wherein the monoanionic ligand is a monoanionic bidentate chelate ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, a monoanionic bidentate chelate ligand having a phenolic hydroxyl group, or a monoanionic bidentate chelate ligand in which two ligand elements are both nitrogen.
3. The organometallic complex according to claim 1 ,
wherein the monoanionic ligand is a ligand selected from the group of consisting of structural formulae (L1) to (L6):
wherein:
R 71 to R 90 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, halogen , a haloalkyl group, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a phenyl group;
A 1 , A 2 , and A 3 separately represent nitrogen or C—R; and
R represents hydrogen, an alkyl group having 1 to 4 carbon atoms, halogen , a haloalkyl group having 1 to 4 carbon atoms, or a phenyl group.
4. The organometallic complex according to claim 1 , wherein R 3 represents hydrogen.
5. The organometallic complex according to claim 1 , wherein R 5 is a substituent represented by the formula (G2).
6. The organometallic complex according to claim 1 , wherein M is iridium or platinum.
7. An organometallic complex represented by a formula (G8),
wherein:
R 1 represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 1 to 5 carbon atoms, or a phenyl group;
R 2 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, or a phenyl group;
R 4 , R 6 , and R 7 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen , a trifluoromethyl group, or a phenyl group;
R 8 , R 9 , R 10 , R 11 , and R 12 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen , a trifluoromethyl group, or a phenyl group;
M represents a Group 9 element or a Group 10 element;
L represents a monoanionic ligand; and
n is 2 when M is a Group 9 element or 1 when M is a Group 10 element.
8. The organometallic complex according to claim 7 ,
wherein the monoanionic ligand is a monoanionic bidentate chelate ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, a monoanionic bidentate chelate ligand having a phenolic hydroxyl group, or a monoanionic bidentate chelate ligand in which two ligand elements are both nitrogen.
9. The organometallic complex according to claim 7 ,
wherein the monoanionic ligand is a ligand selected from the group of consisting of structural formulae (L1) to (L6):
wherein:
R 71 to R 90 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, halogen , a haloalkyl group, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a phenyl group;
A 1 , A 2 , and A 3 separately represent nitrogen or C—R; and
R represents hydrogen, an alkyl group having 1 to 4 carbon atoms, halogen , a haloalkyl group having 1 to 4 carbon atoms, or a phenyl group.
10. The organometallic complex according to claim 7 , wherein R 4 , R 6 , and R 7 separately represent hydrogen.
11. The organometallic complex according to claim 7 , wherein M is iridium or platinum.