METHOD FOR OBTAINING CORRELATION OF THE ABSORPTION AND LUMINESCENCE PROPERTIES OF GRAPHENE QUANTUM DOTS BY CHANGING THEIR SIZE AND SHAPE

摘要

The present invention relates to a method for obtaining correlation between luminescence energy and photoabsorption by classifying the size and the shape of graphene quantum dots. The method controls luminescence and absorption characteristics by changing the size and the shape of the graphene quantum dots by analyzing correlation between luminescence energy and photoabsorption characteristics according to the size and the shape of the graphene quantum dots, by fabricating a graphene oxide sheet from graphite using a Hummers method and fabricating various sizes of graphene quantum dots (GQDs) by repetitive oxidation and reduction and thermal treatment in various compounds, and by fabricating quantum dots with uniform size and shape by filtering using a nano structure membrane. The method comprises: a graphene quantum dot size and shape classification step (S11); a luminescence energy acquisition step (S12) according to the size of the graphene quantum dots; a correlation acquisition step (S13) between the size of the graphene quantum dot and luminescence energy; an occupancy rate acquisition step (S14) of graphene quantum dot shape; and a correlation acquisition step (S15) between the size of graphene quantum dot and photoabsorption. The method of the present invention can increase applicability of not only an analog device but also a digital photoelectronic device by acquiring correlation between luminescence energy and photoabsorption by fabricating graphene quantum dots using a simple physical and a chemical method and classifying the size and the shape of the graphene quantum dots based on luminescence and absorption characteristics. [Reference numerals] (AA) START; (BB) End; (S11) Step of classifying size and shape of graphene quantum dots; (S12) Step of acquiring luminescence energy according to the size of graphene quantum dots; (S13) Step of acquiring correlation between the size of graphene quantum dots and luminescence energy; (S14) Step of acquiring occupancy rate of graphene quantum dot type; (S15) Step of acquiring correlation between the size of graphene quantum dots and photoabsorption