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Title: Photoluminescence, white light emitting properties and related aspects of ZnO nanoparticles admixed with graphene and GaN
Authors: Kumar, Prashant
Panchakarla, L S
Bhat, S Venkataprasad
Maitra, Urmimala
Subrahmanyam, K S
Rao, C N R
Keywords: Field-Effect Transistors
Issue Date: 24-Sep-2010
Publisher: IOP Publishing Ltd
Citation: Nanotechnology 21(38), 385701 (2010)
Abstract: ZnO nanoparticles exhibit a broad band centred around 530 nm in the photoluminescence (PL) spectrum due to the presence of oxygen vacancies. Composites of ZnO nanoparticles with graphenes show marked changes in the PL spectrum with broad bands covering the entire visible region, making them candidates for solid state lighting, while graphene prepared by arc discharge of graphite in a hydrogen atmosphere (HG) containing 2-3 layers as well as boron-doped (BHG) and nitrogen-doped (NHG) samples of HG give white light when admixed with ZnO nanoparticles; excellent results are obtained with the addition of just 7 wt% of BHG to the ZnO nanoparticles. Mixtures of ZnO and GaN nanoparticles also exhibit white light emission. The quantum yields of these ZnO nanoparticle based white light sources are in the 4-6% range. Photoconductivity characteristics of ZnO nanoparticles are affected by the addition of even a small amount of graphene (<0.5 wt%).
Description: Restricted access.
Other Identifiers: 0957-4484
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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