Light-emitting device

1. A light-emitting device comprising:

a first light-emitting element comprising:

a first electrode;

an EL layer over the first electrode; and

a second electrode over the EL layer; and

a second light-emitting element comprising:

a third electrode;

the EL layer over the third electrode; and

the second electrode over the EL layer,

wherein the EL layer comprises a first light-emitting layer, a first layer over and in contact with the first light-emitting layer, and a second light-emitting layer over and in contact with the first layer,

wherein the first electrode comprises a first reflective layer,

wherein the third electrode comprises a second reflective layer and a light-transmitting layer over the second reflective layer,

wherein a material of the first reflective layer is same as a material of the second reflective layer,

wherein the second electrode has a light-transmitting property,

wherein the EL layer is in contact with the first reflective layer,

wherein a first structure of a substance of the first light-emitting layer is different from a second structure of a substance of the second light-emitting layer, and

wherein the first light-emitting element and the second light-emitting element are different in a carrier-injection property.

2. The light-emitting device according to claim 1 ,

wherein a peak wavelength of emission from the first light-emitting element is shorter than a peak wavelength of emission from the second light-emitting element.

3. The light-emitting device according to claim 1 , wherein the second electrode comprises a metal film.

4. The light-emitting device according to claim 1 ,

wherein the EL layer further comprises a second layer in contact with the first reflective layer, and

wherein the second layer comprises an acceptor substance.

5. The light-emitting device according to claim 1 ,

wherein the first electrode comprises titanium, and

wherein the third electrode comprises indium, tin and oxygen.

6. The light-emitting device according to claim 1 ,

wherein the first light-emitting layer comprises a first compound,

wherein the second light-emitting layer comprises a second compound,

wherein the first compound is different from the second compound.

7. The light-emitting device according to claim 6 , wherein each of the first compound and the second compound is a light-emitting material.

8. The light-emitting device according to claim 6 ,

wherein the first compound is a fluorescent light-emitting material, and

wherein the second compound is a phosphorescent light-emitting material.

9. The light-emitting device according to claim 1 , wherein the first light-emitting element emits blue light.

10. The light-emitting device according to claim 1 ,

wherein the first light-emitting element further comprises a first color filter,

wherein the second light-emitting element further comprises a second color filter,

wherein the first color filter is capable of transmitting light whose color is different from a color of light that the second color filter can transmit.

11. The light-emitting device according to claim 1 ,

wherein the first electrode is electrically connected to a first transistor, and

wherein the third electrode is electrically connected to a second transistor.

12. A display panel comprising:

the light-emitting device according to claim 1 ; and

a driver circuit.

13. A lighting device comprising:

the light-emitting device according to claim 1 ; and

a power switch.

14. An electronic appliance comprising:

the light-emitting device according to claim 1 ; and

an operation button.

15. A light-emitting device comprising:

a first light-emitting element comprising:

a first electrode;

an EL layer over the first electrode; and

a second electrode over the EL layer, the second electrode comprising a metal film; and

a second light-emitting element comprising:

a third electrode;

a transmitting layer over the third electrode;

the EL layer over the transmitting layer; and

the second electrode over the EL layer,

wherein the first electrode and the third electrode comprises the same material,

wherein the EL layer comprises:

a hole-injection layer in contact with the first electrode;

a hole-transport layer in contact with the hole-injection layer; and

a first light-emitting layer in contact with the hole-transport layer,

wherein the hole-injection layer comprises an acceptor substance,

wherein the first light-emitting layer comprises a second light-emitting layer and a third light-emitting layer,

wherein the second light-emitting layer comprises a first light-emitting material,

wherein the third light-emitting layer comprises a second light-emitting material,

wherein an emission peak wavelength of the first light-emitting material is shorter than that of the second light-emitting material,

wherein the first light-emitting material is different from the second light-emitting material, and

wherein the first light-emitting element and the second light-emitting element are different in a carrier-injection property.

16. The light-emitting device according to claim 15 ,

wherein each of the first electrode and the third electrode is a reflective layer,

wherein the second electrode has a light-transmitting property, and

wherein a peak wavelength of emission from the first light-emitting element is shorter than a peak wavelength of emission from the second light-emitting element.

17. The light-emitting device according to claim 15 ,

wherein the first light-emitting element further comprises a first color filter,

wherein the second light-emitting element further comprises a second color filter,

wherein the first color filter is capable of transmitting light whose color is different from a color of light that the second color filter can transmit.

18. The light-emitting device according to claim 15 ,

wherein the first electrode is electrically connected to a first transistor, and

wherein the third electrode is electrically connected to a second transistor.

19. A display panel comprising:

the light-emitting device according to claim 15 ; and

a driver circuit.

20. A lighting device comprising:

the light-emitting device according to claim 15 ; and

a power switch.

21. An electronic appliance comprising:

the light-emitting device according to claim 15 ; and

an operation button.

22. The light-emitting device according to claim 15 , wherein the third light-emitting layer is positioned over the second light-emitting layer.

23. The light-emitting device according to claim 15 , wherein the hole-injection layer comprises two layers.