Light-emitting element, compound, organic compound, display module, lighting module, light-emitting device, display device, lighting device, and electronic device
A light-emitting element having high emission efficiency is provided. A light-emitting element having a low driving voltage is provided. A novel compound which can be used for a transport layer or as a host material or a light-emitting material of a light-emitting element is provided. A novel compound with a benzofuropyrimidine skeleton is provided. Also provided is a light-emitting element which includes the compound with the benzofuropyrimidine skeleton between a pair of electrodes.
1. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode; and
a second electrode,
wherein the light-emitting layer comprises a first compound and a second compound and a light-emitting substance,
wherein the first compound is represented by formula (G1):
wherein A 1 represents a substituted or unsubstituted group having 6 to 100 carbon atoms, the group comprising at least one of a phenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, a dibenzothiophenyl group, a dibenzofuranyl group, a carbazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzthiazolyl group, and a triphenyl amine skeleton; and
wherein R 1 to R 5 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted monocyclic saturated hydrocarbon having 5 to 7 carbon atoms, a substituted or unsubstituted polycyclic saturated hydrocarbon having 7 to 10 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.
2. The light-emitting device according to claim 1 ,
wherein:
the first compound is represented by formula (G2):
α represents a substituted or unsubstituted phenylene group;
n is an integer from 0 to 4; and
Ht uni represents a hole-transport skeleton.
3. The light-emitting device according to claim 1 ,
wherein:
the first compound is represented by formula (G3):
4. The light-emitting device according to claim 1 , wherein the first compound is represented by any one of formulae (100), (115), (200), and (300):
5. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode;
an electron-transport layer over the light-emitting layer; and
a second electrode,
wherein the light-emitting layer comprises a first compound and a second compound and a light-emitting substance,
wherein the electron-transport layer comprises a fourth compound,
wherein at least one of the first compound and the fourth compound is represented by formula (G1):
wherein A 1 represents a substituted or unsubstituted group having 6 to 100 carbon atoms, the group comprising at least one of a phenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, a dibenzothiophenyl group, a dibenzofuranyl group, a carbazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzthiazolyl group, and a triphenyl amine skeleton; and
wherein R 1 to R 5 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted monocyclic saturated hydrocarbon having 5 to 7 carbon atoms, a substituted or unsubstituted polycyclic saturated hydrocarbon having 7 to 10 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.
6. The light-emitting device according to claim 5 ,
wherein the first compound is represented by the formula (G1), and
wherein the fourth compound is represented by the formula (G1).
7. The light-emitting device according to claim 5 ,
wherein:
at least one of the first compound and the fourth compound is represented by formula (G2):
α represents a substituted or unsubstituted phenylene group;
n is an integer from 0 to 4; and
Ht uni represents a hole-transport skeleton.
8. The light-emitting device according to claim 5 ,
wherein:
at least one of the first compound and the fourth compound is represented by formula (G3):
9. The light-emitting device according to claim 5 , wherein at least one of the first compound and the fourth compound is represented by any one of formulae (100), (115), (200), and (300):
10. The light-emitting device according to claim 1 , wherein the light-emitting substance comprises a phosphorescent substance.
11. The light-emitting device according to claim 5 , wherein the light-emitting substance comprises a phosphorescent substance.
12. The light-emitting device according to claim 1 ,
wherein the first compound has an electron-transport property, and
wherein the second compound has an hole-transport property.
13. The light-emitting device according to claim 5 ,
wherein the first compound has an electron-transport property, and
wherein the second compound has an hole-transport property.
14. The light-emitting device according to claim 1 , wherein the first compound and the second compound form an exciplex.
15. The light-emitting device according to claim 5 , wherein the first compound and the second compound form an exciplex.
16. The light-emitting device according to claim 14 , wherein an emission spectrum of the exciplex overlaps with an absorption band of the light-emitting substance on a longest wavelength wide in an absorption spectrum.
17. The light-emitting device according to claim 15 , wherein an emission spectrum of the exciplex overlaps with an absorption band of the light-emitting substance on a longest wavelength wide in an absorption spectrum.
18. The light-emitting device according to claim 2 , wherein Ht uni represents any one of a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, and a substituted or unsubstituted carbazolyl group.
19. The light-emitting device according to claim 7 , wherein Ht uni represents any one of a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, and a substituted or unsubstituted carbazolyl group.
20. The light-emitting device according to claim 2 ,
wherein:
Ht uni represents any one of groups represented by formulae (Ht-1) to (Ht-6):
R 6 to R 15 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a substituted or unsubstituted phenyl group; and
R 16 represents any one of an alkyl group having 1 to 6 carbon atoms and a substituted or unsubstituted phenyl group.
21. The light-emitting device according to claim 7 ,
wherein:
Ht uni represents any one of groups represented by formulae (Ht-1) to (Ht-6):
R 6 to R 15 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a substituted or unsubstituted phenyl group; and
R 16 represents any one of an alkyl group having 1 to 6 carbon atoms and a substituted or unsubstituted phenyl group.
22. The light-emitting device according to claim 2 , wherein n is 2.
23. The light-emitting device according to claim 7 , wherein n is 2.
24. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode; and
a second electrode,
wherein the light-emitting layer comprises a compound and a light-emitting substance,
wherein the compound is represented by formula (G1):
wherein A l represents a substituted or unsubstituted group having 6 to 100 carbon atoms, the group comprising at least one of a phenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, a dibenzothiophenyl group, a dibenzofuranyl group, a carbazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzthiazolyl group, and a triphenyl amine skeleton; and
wherein R 1 to R 5 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted monocyclic saturated hydrocarbon having 5 to 7 carbon atoms, a substituted or unsubstituted polycyclic saturated hydrocarbon having 7 to 10 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.
25. The light-emitting device according to claim 24 , wherein the compound is included in a host material of the light-emitting layer.
26. The light-emitting device according to claim 24 , wherein:
the compound is represented by formula (G2):
α represents a substituted or unsubstituted phenylene group;
n is an integer from 0 to 4; and
Ht uni represents a hole-transport skeleton.
27. The light-emitting device according to claim 24 , wherein:
the compound is represented by formula (G3):
28. The light-emitting device according to claim 24 , wherein the compound is represented by any one of formulae (100), (115), (200), and (300):
29. The light-emitting device according to claim 24 , wherein the light-emitting substance comprises a phosphorescent substance.
30. The light-emitting device according to claim 26 , wherein:
Ht uni represents any one of groups represented by formulae (Ht-1) to (Ht-6):
R 6 to R 15 separately represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a substituted or unsubstituted phenyl group; and
R 16 represents any one of an alkyl group having 1 to 6 carbon atoms and a substituted or unsubstituted phenyl group.
31. The light-emitting device according to claim 26 , wherein n is 2.