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:
an anode;
a hole-injection layer over the anode;
a hole-transport layer over the hole-injection layer;
a light-emitting layer over the hole-transport layer; and
a cathode over the light-emitting layer,
wherein the hole-injection layer comprises an organic compound and molybdenum oxide,
wherein the organic compound is represented by a formula (G1),
wherein Ar represents an aryl group having 6 to 70 carbon atoms,
wherein R 0 represents a substituent represented by a formula (g1) and is bonded to a carbon atom represented by either α or β,
wherein 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,
wherein X 1 and X 2 individually represent oxygen or sulfur, and
wherein 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.
2. The light-emitting element according to claim 1 ,
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.
3. The light-emitting element according to claim 1 , wherein R 2 , R 4 , R 5 , R 7 , R 9 , R 10 , R 12 , R 13 , and R 15 are each hydrogen.
4. The light-emitting element according to claim 1 , wherein R 1 to R 7 and R 9 to R 15 are each hydrogen.
5. The light-emitting element according to claim 1 ,
wherein the organic compound is represented by a formula (G2):
and
wherein X represents oxygen or sulfur.
6. The light-emitting element according to claim 1 ,
wherein the organic compound is represented by any of formulae (G3) and (G4):
7. The light-emitting element according to claim 6 , wherein X 1 and X 2 are each sulfur.
8. The light-emitting element according to claim 1 , wherein the hole-transport layer comprises the organic compound represent by the formula (G1).
9. An electronic device comprising the light-emitting element according to claim 1 .
10. A lighting device comprising the light-emitting element according to claim 1 .
11. A light-emitting element comprising:
an anode;
a light-emitting layer over the anode; and
a cathode over the light-emitting layer,
wherein the light-emitting layer comprises a first organic compound, a second organic compound having an electron transport property, and a light-emitting substance,
wherein the first organic compound is represented by any of formulae (G3) and (G4):
wherein Ar represents an aryl group having 6 to 70 carbon atoms, and
wherein X 1 and X 2 are each sulfur.