Light-emitting element, light-emitting device, electronic device, and lighting device
A light-emitting element having a long lifetime is provided. A light-emitting element exhibiting high emission efficiency in a high luminance region is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains a first organic compound, a second organic compound, and a phosphorescent compound. The first organic compound is represented by a general formula (GO). The molecular weight of the first organic compound is greater than or equal to 500 and less than or equal to 2000. The second organic compound is a compound having an electron-transport property. In the general formula (GO), Ar 1 and Ar 2 each independently represent a fluorenyl group, a spirofluorenyl group, or a biphenyl group, and Ar 3 represents a substituent including a carbazole skeleton.
1. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and an iridium complex between the anode and the cathode,
a first layer on the anode,
wherein the first layer comprises an acceptor substance and a third organic compound represented by General Formula (G0),
wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted biphenyl group,
wherein a substituent of the substituted biphenyl group represents any one of an alkyl group having 1 to 10 carbon atoms, an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, and an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms,
wherein Ar 3 represents a substituent including a 9-aryl-9H-carbazol-3-yl skeleton, and
wherein the aryl group of the 9-aryl-9H-carbazol-3-yl skeleton represents an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms.
2. The light-emitting element according to claim 1 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.
3. The light-emitting element according to claim 1 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission peak of the exciplex overlaps with an absorption band on a longest wavelength in an absorption spectrum of the iridium complex.
4. The light-emitting element according to claim 3 ,
wherein the second organic compound comprises a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a quinoline skeleton, a pyrimidine skeleton, a pyrazine skeleton, a pyridine skeleton, a diazole skeleton, or a triazole skeleton.
5. The light-emitting element according to claim 1 ,
wherein the acceptor substance comprises a halogen compound, a cyano compound, and a transition metal oxide, and an oxide of a metal belonging to Groups 4 to 8 of the periodic table.
6. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and an iridium complex between the anode and the cathode,
a first layer on the anode,
wherein the iridium complex has an emission peak at 520 nm to 600 nm,
wherein the first layer comprises an acceptor and a third organic compound represented by General Formula (G0),
wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted biphenyl group,
wherein a substituent of the substituted biphenyl group represents any one of an alkyl group having 1 to 10 carbon atoms, an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, and an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms,
wherein Ar 3 represents a substituent including a 9-aryl-9H-carbazol-3-yl skeleton, and
wherein the aryl group of the 9-aryl-9H-carbazol-3-yl skeleton represents an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms.
7. The light-emitting element according to claim 6 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.
8. The light-emitting element according to claim 6 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission peak of the exciplex overlaps with an absorption band on a longest wavelength in an absorption spectrum of the iridium complex.
9. The light-emitting element according to claim 8 ,
wherein the second organic compound comprises a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a quinoline skeleton, a pyrimidine skeleton, a pyrazine skeleton, a pyridine skeleton, a diazole skeleton, or a triazole skeleton.
10. The light-emitting element according to claim 6 ,
wherein the acceptor substance comprises a halogen compound, a cyano compound, and a transition metal oxide, and an oxide of a metal belonging to Groups 4 to 8 of the periodic table.
11. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and an iridium complex between the anode and the cathode,
a first layer on the anode,
a second layer between the first layer and the light-emitting layer,
wherein the first layer comprises an acceptor substance and a third organic compound represented by General Formula (G0),
wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted biphenyl group,
wherein a substituent of the substituted biphenyl group represents any one of an alkyl group having 1 to 10 carbon atoms, an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, and an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms,
wherein Ar 3 represents a substituent including a 9-aryl-9H-carbazol-3-yl skeleton,
wherein the aryl group of the 9-aryl-9H-carbazol-3-yl skeleton represents an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, and
wherein the second layer comprises an aromatic amine compound.
12. The light-emitting element according to claim 11 ,
wherein the aromatic amine compound is a diamine.
13. The light-emitting element according to claim 11 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.
14. The light-emitting element according to claim 11 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission peak of the exciplex overlaps with an absorption band on a longest wavelength in an absorption spectrum of the iridium complex.
15. The light-emitting element according to claim 14 ,
wherein the second organic compound comprises a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a quinoline skeleton, a pyrimidine skeleton, a pyrazine skeleton, a pyridine skeleton, a diazole skeleton, or a triazole skeleton.
16. The light-emitting element according to claim 11 ,
wherein the acceptor substance comprises a halogen compound, a cyano compound, and a transition metal oxide, and an oxide of a metal belonging to Groups 4 to 8 of the periodic table.