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원자제어 저차원 전자계 연구단
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Electroluminescence from Graphene Quantum Dots Prepared by Amidative Cutting of Tattered Graphite Highly Cited Paper

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Title
Electroluminescence from Graphene Quantum Dots Prepared by Amidative Cutting of Tattered Graphite
Author(s)
Kwon, W; Kim, YH; Lee, CL; Minkyung Lee; Hee Cheul Choi; Lee, TW; Rhee, SW
Publication Date
2014-03
Journal
NANO LETTERS, v.14, no.3, pp.1306 - 1311
Publisher
AMER CHEMICAL SOC
Abstract
Size-controlled graphene quantum dots (GQDs) are prepared via amidative cutting of tattered graphite. The power of this method is that the size of the GQDs could be varied from 2 to over 10 nm by simply regulating the amine concentration. The energy gaps in such GQDs are narrowed down with increasing their size, showing colorful photoluminescence from blue to brown. We also reveal the roles of defect sites in photoluminescence, developing long-wavelength emission and reducing exciton lifetime. To assess the viability of the present method, organic light-emitting diodes employing our GQDs as a dopant are first demonstrated with the thorough studies in their energy levels. This is to our best knowledge the first meaningful report on the electroluminescence of GQDs, successfully rendering white light with the external quantum efficiency of ca. 0.1%. © 2014 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/1526
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Files in This Item:
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