Emissive ZnO–graphene quantum dots for white-light-emitting diodes View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2012-07

AUTHORS

Dong Ick Son, Byoung Wook Kwon, Dong Hee Park, Won-Seon Seo, Yeonjin Yi, Basavaraj Angadi, Chang-Lyoul Lee, Won Kook Choi

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. More... »

PAGES

465

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nnano.2012.71

DOI

http://dx.doi.org/10.1038/nnano.2012.71

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019943142

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22635098


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