Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28413
Title: Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots
Authors: Tang, L
Ji, R
Cao, X
Lin, J
Jiang, H
Li, X
Teng, KS
Luk, CM
Zeng, S
Hao, J 
Lau, SP 
Keywords: deep ultraviolet
fluorescence
grapheme
graphene quantum dots
quantum dots
self-passivated
Issue Date: 2012
Publisher: American Chemical Society
Source: ACS nano, 2012, v. 6, no. 6, p. 5102-5110 How to cite?
Journal: ACS nano 
Abstract: Figure Persented: Glucose-derived water-soluble crystalline graphene quantum dots (GQDs) with an average diameter as small as 1.65 nm (∼5 layers) were prepared by a facile microwave-assisted hydrothermal method. The GQDs exhibits deep ultraviolet (DUV) emission of 4.1 eV, which is the shortest emission wavelength among all the solution-based QDs. The GQDs exhibit typical excitation wavelength-dependent properties as expected in carbon-based quantum dots. However, the emission wavelength is independent of the size of the GQDs. The unique optical properties of the GQDs are attributed to the self-passivated layer on the surface of the GQDs as revealed by electron energy loss spectroscopy. The photoluminescence quantum yields of the GQDs were determined to be 7-11%. The GQDs are capable of converting blue light into white light when the GQDs are coated onto a blue light emitting diode.
URI: http://hdl.handle.net/10397/28413
ISSN: 1936-0851
EISSN: 1936-086X
DOI: 10.1021/nn300760g
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