Abstract: The present disclosure relates to a light emitting device using graphene quantum dot and a preparing method of the light emitting device using graphene quantum dot.

Abstract: The present disclosure relates to graphene quantum dot and a method for preparing the graphene quantum dot.

Abstract: In a method for forming a graphene quantum dot, a first reduced graphene oxide product having a first size is formed by applying microwaves to a graphene oxide material. The first reduced graphene oxide product is oxidized by applying microwaves to a mixed solution including an acid solution, a first oxidant, and the first reduced graphene oxide product so as to form a first graphene oxide product having a second size. Microwaves are applied to the first graphene oxide product so as to form a second reduced graphene oxide product having a third size which is smaller than the first size.

Abstract: Graphite is oxidized using an acid so as to form a first reaction product that comprises graphene oxide. The acid is recovered from the first reaction product. Graphite is oxidized using the recovered acid so as to form a recycle-reaction product that comprises graphene oxide.