Graphene light-emitting device and method of manufacturing the same
View Patent ↗A graphene light-emitting device and a method of manufacturing the same are provided. The graphene light-emitting device includes a p-type graphene doped with a p-type dopant; an n-type graphene doped with an n-type dopant; and an active graphene that is disposed between the type graphene and the n-type graphene and emits light, wherein the p-type graphene, the n-type graphene, and the active graphene are horizontally disposed.
1. A graphene light-emitting device comprising:
a p-type graphene doped with a p-type dopant;
an n-type graphene doped with an n-type dopant; and
an active graphene that is disposed between the p-type graphene and the n-type graphene and emits light,
wherein the p-type graphene, the n-type graphene, and the active graphene are horizontally disposed, and
wherein the active graphene comprises a graphene superlattice.
2. The graphene light-emitting device of claim 1 , wherein the graphene superlattice has a multiple quantum well potential.
3. The graphene light-emitting device of claim 1 , wherein the graphene superlattice comprises at least one graphene nanoribbon having a band shape connecting the p-type graphene to the n-type graphene.
4. The graphene light-emitting device of claim 3 , wherein at least one of opposite edges of the at least one graphene nanoribbon has a zigzag shape.
5. The graphene light-emitting device of claim 4 , wherein a width of each of the at least one graphene nanoribbon periodically changes within a range of about 3 nm to about 20 nm.
6. The graphene light-emitting device of claim 3 , wherein an interval between adjacent graphene nanoribbons of the at least one graphene nanoribbon is in a range of about 2 nm to about 19 nm.
7. The graphene light-emitting device of claim 1 , wherein the graphene superlattice comprises at least one graphene nanoribbon that extends parallel to boundaries of the p-type graphene and the n-type graphene between the p-type graphene and the n-type graphene.
8. The graphene light-emitting device of claim 7 , wherein at least one of opposite edges of the at least one graphene nanoribbon has a zigzag shape.
9. The graphene light-emitting device of claim 1 , wherein the graphene superlattice has periodically arranged quantum dot patterns.
10. The graphene light-emitting device of claim 1 , wherein the active graphene further comprises a plurality of graphene quantum dots dispersed between the p-type graphene and the n-type graphene.
11. The graphene light-emitting device of claim 10 , wherein a first region in which the graphene superlattice is disposed and a second region in which a plurality of graphene quantum dots are disposed do not overlap.
12. The graphene light-emitting device of claim 10 , wherein a first region in which the graphene superlattice is disposed and a second region in which a plurality of graphene quantum dots are alternately arranged.
13. The graphene light-emitting device of claim 10 , wherein a first region in which the graphene superlattice is disposed and a second region in which a plurality of graphene quantum dots are disposed overlap.
14. The graphene light-emitting device of claim 1 , wherein the active graphene comprises a plurality of graphene quantum dots dispersed between the p-type graphene and the n-type graphene.
15. The graphene light-emitting device of claim 10 , wherein the graphene quantum dots have substantially the same size.
16. The graphene light-emitting device of claim 10 , wherein the graphene quantum dots have at least two different sizes.
17. The graphene light-emitting device of claim 16 , wherein the graphene quantum dots comprise three different sizes respectively corresponding to a red photoluminescence, a green photoluminescence, and a blue photoluminescence.
18. The graphene light-emitting device of claim 14 , wherein the graphene quantum dots have substantially the same shape.
19. The graphene light-emitting device of claim 14 , wherein the graphene quantum dots have at least two different shapes.
20. The graphene light-emitting device of claim 1 , wherein the active graphene is a graphene that is functionalized by attaching a functional group to a surface or edge of the graphene.
21. A graphene light-emitting device comprising:
a p-type graphene doped with a p-type dopant;
an n-type graphene doped with an n-type dopant; and
an active graphene that is disposed between the p-type graphene and the n-type graphene and emits light,
wherein the p-type graphene, the n-type graphene, and the active graphene are horizontally disposed,
wherein the active graphene is a graphene that is functionalized by attaching a functional group to a surface or edge of the graphene, and
wherein the functional group is alkylamine, aniline, methylene blue, or an amine-based polymer.
22. The graphene light-emitting device of claim 1 , wherein the p-type graphene, the n-type graphene, and the active graphene are supported by a substrate.
23. The graphene light-emitting device of claim 1 , wherein the p-type dopant is at least one element selected from the group consisting of oxygen (O), gold (Au), and bismuth (Bi); at least one compound selected from the group consisting of CH 3 NO 2 , HNO 3 , HAuCl 4 , H 2 SO 4 , HCl, and AuCl 3 ; or a mixture thereof.
24. The graphene light-emitting device of claim 1 , wherein the n-type dopant is at least one element selected from the group consisting of nitrogen (N), fluorine (F), and manganese (Mn); NH 3 ; or a mixture thereof.
25. The graphene light-emitting device of claim 1 , wherein the p-type graphene is horizontally spaced from the n-type graphene.