Emissive ZnO-graphene quantum dots for white-light-emitting diodes

Title
Emissive ZnO-graphene quantum dots for white-light-emitting diodes
Authors
손동익권병욱박동희서원선이연진Basavarj Angadi이창열최원국
Keywords
ZnO-graphene; Core-shell quantum dots; light emitting diode; photoluminescence; electroluminescene; density functional theory
Issue Date
2012-07
Publisher
Nature nanotechnology
Citation
VOL 7, NO 7, 465-471
Abstract
Hybrid nanostructures combining inorganic materials and graphene are being developed for applications such as fuel cells, batteries, photovoltaics and sensors. However, the absence of a bandgap in graphene has restricted the electrical and optical characteristics of these hybrids, particularly their emissive properties. Here, we use a simple solution method to prepare emissive hybrid quantum dots consisting of a ZnO core wrapped in a shell of single-layer graphene. We then use these quantum dots to make a white-light-emitting diode with a brightness of 798 cd m-2. The strain introduced by curvature opens an electronic bandgap of 250 meV in the graphene, and two additional blue emission peaks are observed in the luminescent spectrum of the quantum dot. Density functional theory calculations reveal that these additional peaks result from a splitting of the lowest unoccupied orbitals of the graphene into three orbitals with distinct energy levels. White emission is achieved by combining the quantum dots with other emissive materials in a multilayer light-emitting diode.
URI
http://pubs.kist.re.kr/handle/201004/42851
ISSN
17483387
Appears in Collections:
KIST Publication > Article
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