Light emitting device having organic light emitting material with mixed layer
View Patent ↗A light emitting device is provided which has a structure for lowering energy barriers at interfaces between layers of a laminate organic compound layer. A mixed layer ( 105 ) composed of a material that constitutes an organic compound layer ( 1 ) ( 102 ) and a material that constitutes an organic compound layer ( 2 ) ( 103 ) is formed at the interface between the organic compound layer ( 1 ) ( 102 ) and the organic compound layer ( 2 ) ( 103 ). The energy barrier formed between the organic compound layer ( 1 ) ( 102 ) and the organic compound layer ( 2 ) ( 103 ) thus can be lowered.
1. A light emitting device comprising an organic light emitting element comprising:
a hole injecting layer comprising a first organic compound that serves as a hole injecting material in contact with an anode;
a hole transporting layer comprising a second organic compound that serves as a hole transporting material; and
a mixed region comprising the first organic compound and the second organic compound between the hole injecting layer and the hole transporting layer.
2. A light emitting device according to claim 1 , wherein a concentration of the first organic compound in the mixed region declines toward the hole transporting layer from the hole injection layer.
3. A light emitting device according to claim 1 , wherein the organic light emitting element emits light from a triplet excitation state.
4. An electronic appliance comprising a light emitting device according to claim 1 .
5. A light emitting device comprising an organic light emitting element comprising:
a hole injecting layer comprising a first organic compound that serves as a hole injecting material in contact with an anode;
a hole transporting layer comprising a second organic compound that serves as a hole transporting material; and
a mixed layer comprising the first organic compound and the second organic compound between the hole injecting layer and the hole transporting layer.
6. A light emitting device according to claim 5 , wherein a concentration of the first organic compound in the mixed layer declines toward the hole transporting layer from the hole injection layer.
7. A light emitting device according to claim 5 , wherein the organic light emitting element emits light from a triplet excitation state.
8. An electronic appliance comprising a light emitting device according to claim 3 .
9. A light emitting device comprising an organic light emitting element comprising:
an electron injecting layer comprising a first organic compound that serves as an electron injecting material in contact with a cathode;
an electron transporting layer comprising a second organic compound that serves as an electron transporting material; and
a mixed region comprising the first organic compound and the second organic compound between the electron injecting layer and the electron transporting layer.
10. A light emitting device according to claim 9 , wherein a concentration of the first organic compound in the mixed region declines toward the electron transporting layer from the electron injecting layer.
11. A light emitting device according to claim 9 , wherein the organic light emitting element emits light from a triplet excitation state.
12. An electronic appliance comprising a light emitting device according to claim 5 .
13. A light emitting device comprising an organic light emitting element comprising:
an electron injecting layer comprising a first organic compound that serves as an electron injecting material in contact with a cathode;
an electron transporting layer comprising a second organic compound that serves as an electron transporting material; and
a mixed layer comprising the first organic compound and the second organic compound between the electron injecting layer and the electron transporting layer.
14. A light emitting device according to claim 13 , wherein a concentration of the first organic compound in the mixed layer declines toward the electron transporting layer from the electron injecting layer.
15. A light emitting device according to claim 13 , wherein the organic light emitting element emits light from a triplet excitation state.
16. An electronic appliance comprising a light emitting device according to claim 13 .