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. A light-emitting element comprising a layer containing an organic compound between a pair of electrodes,
wherein the organic compound contains a carbazole group,
wherein a 4-position of a dibenzothiophene skeleton or a 4-position of a dibenzofuran skeleton is bonded to a 2- or 3-position of the carbazole group,
wherein an aryl group is bonded to a 9-position of the carbazole group, and
wherein the aryl group has 6 to 70 carbon atoms and comprises a substituent selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group.
2. The light-emitting element according to claim 1 ,
wherein a 4-position of a dibenzothiophene skeleton or a 4-position of a dibenzofuran skeleton is further bonded to a 6- or 7-position of carbazole the carbazole group.
3. A light-emitting element comprising a layer containing an organic compound between a pair of electrodes,
wherein the organic compound contains a carbazole group,
wherein a 4-position of a dibenzothiophene skeleton or a 4-position of a dibenzofuran skeleton is bonded to 2- and 7-positions of the carbazole group or 3- and 6-positions of the carbazole group,
wherein an aryl group is bonded to a 9-position of the carbazole group, and
wherein the aryl group has 6 to 70 carbon atoms and comprises a substituent selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group.
4. A light-emitting element comprising a layer containing an organic compound between a pair of electrodes,
wherein the organic compound is represented by a formula (G1):
wherein:
Ar represents an aryl group having 6 to 70 carbon atoms and comprises a substituent selected from a benzimidazolyl group, a benzoxazolyl group, and an oxadiazolyl group;
R 0 represents a substituent represented by a formula (g1):
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 group substituent represented by a formula (g2):
a substitution site of R 0 is a carbon atom represented by either a or β, and a substitution site of R 8 is a carbon atom represented by either γ or δ, and
wherein:
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.
5. The light-emitting element according to claim 4 ,
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.
6. The light-emitting element according to claim 4 ,
wherein:
R 0 represents a substituent represented by a formula (g3):
R 8 represents any one of hydrogen, an aryl group having 6 to 15 carbon atoms, an alkyl group having 1 to 6 carbon atoms, and a substituent represented by a formula (g4):
7. The light-emitting element according to claim 6 ,
wherein R 8 is bonded to the carbon atom represented by γ when R 8 is the substituent represented by the formula (g4) 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 (g4) and R 0 is bonded to the carbon atom represented by β.
8. The light-emitting element according to claim 6 ,
wherein:
R 8 represents any of hydrogen and the substituent represented by the formula (g4).
9. The light-emitting element according to claim 4 ,
wherein:
R 0 represents a substituent represented by a formula (g5):
R 8 represents any of hydrogen and a substituent represented by a formula (g6):
10. The light-emitting element according to claim 9 ,
wherein R 8 is bonded to the carbon atom represented by γ when R 8 is the substituent represented by the formula (g6) 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 (g6) and R 0 is bonded to the carbon atom represented by β.
11. The light-emitting element according to claim 4 ,
wherein the organic compound is represented by a formula (G2):
wherein X represents oxygen or sulfur.
12. The light-emitting element according to claim 4 ,
wherein the organic compound is represented by a formula (G3):
13. The light-emitting element according to claim 4 ,
wherein the organic compound is represented by a formula (G4):
14. The light-emitting element according to claim 4 ,
wherein X 1 and X 2 each are sulfur.