LIGHT-EMITTING MATERIAL, LIGHT-EMITTING DEVICE, AND ELECTRONIC APPLIANCE

Abstract

It is an object of the present invention to provide a light-emitting material with high light emission intensity. It is another object to provide a light-emitting element with high light emission efficiency. Moreover, it is another object to provide a light-emitting device and an electronic appliance with reduced power consumption. A light-emitting material contains at least a light-emitting substance, a base material, and an additive which is an element belonging to group 14 of the periodic table or a compound containing two or more kinds of elements belonging to group 14, or a compound containing at least two or more kinds of elements each belonging to a different group chosen from group 13, group 14, and group 15. Due to the light-emitting material, a light-emitting element and an electronic appliance which has high light emission efficiency and can be driven at a low voltage can be obtained.

Description

BRIEF DESCRIPTION OF DRAWINGS

In the accompanying drawings:

FIGS. 1A and 1B are views each explaining a light-emitting element of the present invention;

FIGS. 2A and 2B are views each explaining a light-emitting device of the present invention;

FIG. 3 is a view explaining a light-emitting device of the present invention;

FIGS. 4A to 4D are views each explaining an electronic appliance of the present invention;

FIG. 5 is a view explaining an electronic appliance of the present invention;

FIG. 6 is a view explaining an electronic appliance of the present invention;

FIG. 7 is a view explaining a lighting device of the present invention;

FIG. 8 is a view explaining a lighting device of the present invention;

FIG. 9 is a view explaining a light-emitting element manufactured in Embodiment 2; and

FIG. 10 is a graph showing voltage-luminance characteristics of light-emitting elements manufactured in Embodiment 2.

Claims

1. A light-emitting material comprising: a light-emitting substance;a base material; andan additive,wherein the light-emitting substance is an element which becomes an emission center, andwherein the additive is an element selected from group 14 of the periodic table.

2. A light-emitting material comprising: a light-emitting substance;a base material; andan additive,wherein the light-emitting substance is an element which becomes an emission center, andwherein the additive is a compound containing two or more kinds of elements selected from group 14 of the periodic table.

3. A light-emitting material comprising: a light-emitting substance;a base material; andan additive,wherein the light-emitting substance is an element which becomes an emission center, andwherein the additive is a compound containing at least two or more kinds of elements each belonging to a different group chosen from group 13, group 14, and group 15 of the periodic table.

4. A light-emitting material according to claim 3, wherein the additive contains two or more kinds of elements belonging to the same group.

5. A light-emitting material comprising: a light-emitting substance;a base material; andan additive,wherein the light-emitting substance is an element which becomes an emission center, andwherein the additive is a compound containing at least one kind of element of each of group 13, group 14, and group 15 of the periodic table.

6. A light-emitting material according to claim 5, wherein the additive contains two or more kinds of elements belonging to the same group.

7. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is an element selected from group 14 of the periodic table.

8. A light-emitting device according to claim 7, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

9. A light-emitting device according to claim 7, wherein the light-emitting substance is an element which becomes an emission center.

10. A light-emitting device according to claim 7, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

11. A light-emitting device according to claim 7, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

12. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing two or more kinds of elements selected from group 14 of the periodic table.

13. A light-emitting device according to claim 12, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

14. A light-emitting device according to claim 12, wherein the light-emitting substance is an element which becomes an emission center.

15. A light-emitting device according to claim 12, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

16. A light-emitting device according to claim 12, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

17. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing at least two or more kinds of elements each belonging to a different group chosen from group 13, group 14, and group 15 of the periodic table.

18. A light-emitting device according to claim 17, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

19. A light-emitting device according to claim 17, wherein the light-emitting substance is an element which becomes an emission center.

20. A light-emitting device according to claim 17, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

21. A light-emitting device according to claim 17, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

22. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing at least one kind of element of each of group 13 and group 14 of the periodic table.

23. A light-emitting device according to claim 22, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

24. A light-emitting device according to claim 22, wherein the light-emitting substance is an element which becomes an emission center.

25. A light-emitting device according to claim 22, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

26. A light-emitting device according to claim 22, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

27. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing at least one kind of element of each of group 13 and group 15 of the periodic table.

28. A light-emitting device according to claim 27, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

29. A light-emitting device according to claim 27, wherein the light-emitting substance is an element which becomes an emission center.

30. A light-emitting device according to claim 27, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

31. A light-emitting device according to claim 27, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

32. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing at least one kind of element of each of group 14 and group 15 of the periodic table.

33. A light-emitting device according to claim 32, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

34. A light-emitting device according to claim 32, wherein the light-emitting substance is an element which becomes an emission center.

35. A light-emitting device according to claim 32, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

36. A light-emitting device according to claim 32, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.

37. A light-emitting device comprising: a first electrode;a second electrode; anda light-emitting layer containing a light-emitting substance, a base material, and an additive, which is interposed between the first electrode and the second electrode,wherein the additive is a compound containing at least one kind of element of each of group 13, group 14, and group 15 of the periodic table.

38. A light-emitting device according to claim 37, wherein an insulating layer is provided between the light-emitting layer and at least one of the first electrode and the second electrode.

39. A light-emitting device according to claim 37, wherein the light-emitting substance is an element which becomes an emission center.

40. A light-emitting device according to claim 37, wherein the base material is a compound containing at least one kind of element of each of group 2A and group 6B of the periodic table, or a compound containing at least one kind of element of each of group 2B and group 6B of the periodic table.

41. A light-emitting device according to claim 37, wherein the light-emitting substance is manganese, silver, copper, samarium, terbium, erbium thulium, europium, cerium, or praseodymium.