Method for manufacturing graphene light source, organic light-emitting device comprising graphene light source, and method for manufacturing organic light-emitting device

1 . A method for manufacturing a graphene light source, the method comprising:

forming a graphene layer and electrodes in contact with both sides of the graphene layer;

forming a nano-gap of the graphene layer; and

forming a graphene oxide layer by bonding ionized oxygen to a portion of the graphene layer adjacent to one side of the nano-gap,

wherein the graphene oxide layer emits green light or blue light.

2 . The method for manufacturing a graphene light source of claim 1 , wherein the forming of the nano-gap comprises applying a first voltage to the electrodes.

3 . The method for manufacturing a graphene light source of claim 1 , wherein the forming of the nano-gap comprises performing a patterning process on the graphene layer.

4 . The method for manufacturing a graphene light source of claim 3 , wherein the patterning process is an E-beam lithography process.

5 . The method for manufacturing a graphene light source of claim 1 , wherein:

the forming of the nano-gap comprises applying a first voltage to the electrodes; and

the forming of the graphene oxide layer comprises applying a second voltage to the electrodes,

wherein the first voltage and the second voltage are about 5 V to about 40 V.

6 . The method for manufacturing a graphene light source of claim 5 , further comprising reducing the graphene oxide layer by applying a third voltage to the electrodes, wherein the third voltage is smaller than the first voltage and the second voltage.

7 . The method for manufacturing a graphene light source of claim 6 , wherein the third voltage is about 5 V to about 30 V.

8 . The method for manufacturing a graphene light source of claim 1 , wherein:

the electrodes comprise a first electrode and a second electrode; and

the graphene layer comprises:

a first portion adjacent to the first electrode;

a second portion adjacent to the second electrode;

a third portion connected to the first portion and decreasing in width toward the second portion;

a fourth portion connected to the second portion and decreasing in width toward the first portion; and

a fifth portion provided between the third portion and the fourth portion.

9 . The method for manufacturing a graphene light source of claim 8 , wherein the forming of the nano-gap comprises removing the fifth portion of the graphene layer.

10 . The method for manufacturing a graphene light source of claim 1 , wherein the width of the nano-gap is about 0.6 nm to about 10 nm.

11 . The method for manufacturing a graphene light source of claim 1 , further comprising injecting gas containing nitrogen into the graphene layer, wherein the graphene layer includes graphene not doped with impurities or graphene doped with nitrogen.

12 . The method for manufacturing a graphene light source of claim 1 , wherein the nano-gap is formed at a predetermined position according to the shape or manufacturing process of the graphene layer.

13 . An organic light emitting element comprising:

a substrate;

a hole injection layer on the substrate;

a hole transport layer on the hole injection layer;

a graphene oxide layer on the hole transport layer;

an electron transport layer on the graphene oxide layer;

an electron injection layer on the electron transport layer;

a first electrode electrically connected to the hole injection layer; and

a second electrode electrically connected to the electron injection layer,

wherein:

the graphene oxide layer includes a graphene quantum dot; and

the graphene oxide layer is configured to emit green light or blue light.

14 . The organic light emitting element of claim 13 , wherein the graphene quantum dot comprises ionized oxygen atoms.

15 . The organic light emitting element of claim 13 , wherein the graphene oxide layer comprises graphene not doped with impurities or graphene doped with nitrogen.

16 . The organic light emitting element of claim 13 , wherein the graphene oxide layer has a mono-layer structure or a multi-layer structure in which 2 to 10 layers are stacked.

17 . The organic light emitting element of claim 13 , wherein the graphene oxide layer comprises a hydroxyl group having an oxygen functional group bonded to a carbon atom.

18 . A method for manufacturing an organic light emitting element including a graphene light source, the method comprising:

sequentially forming a hole injection layer, a hole transport layer, and a graphene layer on a substrate;

forming electrodes in contact with both sides of the graphene layer;

forming a graphene quantum dot in the graphene layer;

performing a patterning process on the hole injection layer, the hole transport layer, and the graphene layer;

sequentially forming an electron transport layer and an electron injection layer on the graphene quantum dot of the graphene layer; and

electrically connecting the electrodes to the hole injection layer and the electron injection layer;

wherein the forming of the graphene quantum dot includes:

forming a nano-gap of the graphene layer; and

forming a graphene oxide layer by bonding ionized oxygen to a portion of the graphene layer adjacent to one side of the nano-gap.

19 . The method for manufacturing an organic light emitting element including a graphene light source of claim 18 , wherein the graphene layer adjacent to the other side of the nano-gap is removed by the patterning process.

20 . The method for manufacturing an organic light emitting element including a graphene light source of claim 18 , wherein the graphene oxide layer is configured to emit green light or blue light.