Phosphorescent organometallic iridium complex, light-emitting element, light-emitting device, electronic device, and lighting device
As a novel substance having a novel skeleton, provided is a novel phosphorescent organometallic iridium complex that can emit phosphorescence in a blue green to red wavelength region and has high emission efficiency. The phosphorescent organometallic iridium complex has a ligand having a pyridyl pyrimidine skeleton, i.e., the phosphorescent organometallic iridium complex has a ligand having a structure represented by the following general formula (G0). Note that in the formula, R 1 and R 4 to R 6 separately represent hydrogen or an alkyl group having 1 to 6 carbon atoms; and R 2 and R 3 separately represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a phenyl group that may have a substituent, and a pyridyl group that may have a substituent.
1. A light-emitting element comprising a compound represented by a formula (G2)
wherein:
R 1 and R 4 to R 6 separately represent hydrogen or an alkyl group having 1 to 6 carbon atoms,
R 2 and R 3 separately represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted pyridyl group, and
L represents a monoanionic ligand.
2. A light-emitting device comprising the light-emitting element according to claim 1 .
3. An electronic device comprising the light-emitting device according to claim 2 .
4. A lighting device comprising the light-emitting device according to claim 2 .
5. The light-emitting element according to claim 1 ,
wherein:
the monoanionic ligand is represented by one of formulae (L1) to (L6)
R 11 to R 42 separately represent any of hydrogen, a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, halogen, a vinyl group, a substituted or unsubstituted haloalkyl group having 1 to 4 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 4 carbon atoms, and a substituted or unsubstituted alkylthio group having 1 to 4 carbon atoms, and
A 1 to A 3 separately represent any of nitrogen, sp2 hybridized carbon bonded to hydrogen, and sp2 hybridized carbon bonded to any of an alkyl group having 1 to 4 carbon atoms, halogen, a haloalkyl group having 1 to 4 carbon atoms, and a phenyl group.
6. The light-emitting element according to claim 1 , wherein the compound is represented by a formula (100)
7. The light-emitting element according to claim 1 , wherein the compound is represented by a formula (101)
8. The light-emitting element according to claim 1 , wherein the compound is represented by a formula (117)