Light-emitting element and electronic device
An object is to provide a light-emitting element with high emission efficiency which includes a novel carbazole derivative that has a wide energy gap and can be used for a transport layer or a host material in a light-emitting element. A carbazole derivative in which the 4-position of dibenzothiophene or dibenzofuran is bonded to the 2- or 3-position of carbazole has been able to be provided by use of the carbazole derivative. Further, a light-emitting element having high emission efficiency has been able to be provided by use of the carbazole derivative.
1. An organic compound comprising: a carbazole group; and one of a dibenzothiophene group and a dibenzofuran group, wherein a 4-position of the dibenzothiophene group or a 4-position of the dibenzofuran group is bonded to a 2- or 3-position of the carbazole group, wherein a heteroaromatic group or an aryl group which comprises a π-electron deficient heteroaromatic ring is bonded to a 9-position of the carbazole group, and
wherein the π-electron deficient heteroaromatic ring is selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group.
2. The organic compound according to claim 1 ,
wherein a 4-position of a dibenzothiophene group or a 4-position of a dibenzofuran group is further bonded to a 6- or 7-position of the carbazole group.
3. A light-emitting device comprising the organic compound according to claim 1 .
4. An electronic device comprising the light-emitting device according to claim 3 .
5. A lighting device comprising the light-emitting device according to claim 3 .
6. An organic compound comprising: a carbazole group; and
one of a dibenzothiophene group and a dibenzofuran group,
wherein a 4-position of the dibenzothiophene group or a 4-position of the dibenzofuran group is bonded to 2- and 7-positions of the carbazole group or 3- and 6-positions of the carbazole group, wherein a heteroaromatic group or an aryl group which comprises a π-electron deficient heteroaromatic ring is bonded to a 9-position of the carbazole group, and wherein the π-electron deficient heteroaromatic ring is selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group.
7. A light-emitting device comprising the organic compound according to claim 6 .
8. An electronic device comprising the light-emitting device according to claim 7 .
9. A lighting device comprising the light-emitting device according to claim 7 .
10. An organic compound represented by a formula (G1):
wherein:
Ar represents a heteroaromatic group or an aryl group which comprises a π-electron deficient heteroaromatic ring;
R 0 represents a substituent represented by a formula (g1) and is bonded to a carbon atom represented by either α or β:
R 8 represents any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 15 carbon atoms, and a substituent represented by a formula (g2) and is bonded to a carbon atom represented by either γ or δ:
X 1 and X 2 individually represent oxygen or sulfur; and
R 1 to R 7 and R 9 to R 15 individually represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and an aryl group having 6 to 15 carbon atoms, and
wherein the π-electron deficient heteroaromatic ring is selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group.
11. The organic compound according to claim 10 ,
wherein R 8 is bonded to the carbon atom represented by γ when R 8 is the substituent represented by the formula (g2) and R 0 is bonded to the carbon atom represented by α, and
wherein R 8 is bonded to the carbon atom represented by δ when R 8 is the substituent represented by the formula (g2) and R 0 is bonded to the carbon atom represented by β.
12. The organic compound according to claim 10 ,
wherein R 2 , R 4 , R 5 , R 7 , R 9 , R 10 , R 12 , R 13 , and R 15 are each hydrogen.
13. The organic compound according to claim 10 ,
wherein R 1 to R 7 and R 9 to R 15 are each hydrogen.
14. The organic compound according to claim 10 ,
wherein the organic compound is represented by a formula (G2):
wherein X represents oxygen or sulfur.
15. The organic compound according to claim 10 ,
wherein the organic compound is represented by any of formulae (G3) and (G4):
16. The organic compound according to claim 15 ,
wherein X 1 and X 2 are each sulfur.
17. A light-emitting device comprising the organic compound according to claim 10 .
18. An electronic device comprising the light-emitting device according to claim 10 .
19. A lighting device comprising the light-emitting device according to claim 10 .