121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-489
Subject Synthesis of single crystalline graphene quantum dots and its application to light-emitting diodes
Authors Seok Hwan Lee, O Ok Park*
Dept. of Chemical Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Korea
Abstract Graphene-based carbon nanostructure with sub micrometer-sized have been of great interests due to existence of unique electronic properties. For example, quantum confinement, bandgap theory and more of that from conventional semiconductor nanostructure studies can be applied into sub micrometer-sized graphene structure. Especially, existence of bandgap on graphene nanostructure bring a lot of attention. The edge states of graphene nanostructure are predicted to origin of bandgap but direct observation of well-ordered edge structure and uniform synthesized graphene –including hexagonal shaped structure- has not yet been achieved owing to the limited precision of current synthesis approaches. Here, we report on a novel approach not just for the synthesis single-crystalline graphene quantum dots (GQDs) but also a new discovery that constructing graphitic carbon structure from carbohydrates molecule via solution chemistry. As synthesized GQDs were found to have clear hexagonal edged structure, which has never been observed in bottom up synthetic route. Furthermore, single crystalline GQDs used as an emitter on inverted structure light emitting diodes, and exhibits stable deep-blue emission.
E-mail spec@kaist.ac.kr