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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5766

Title: Sensitizing effects of ZnO quantum dots on red-emitting Pr3+-doped SiO2 phosphor
Authors: Mbule, PS
Mhlongo, GH
Pitale, SS
Swart, HC
Ntwaeaborwa, OM
Keywords: Quantum dots
Phosphor
Absorption
Cathodoluminescence
Issue Date: May-2012
Publisher: Elsevier
Citation: Mbule, PS, Mhlongo, GH, Pitale, SS, Swart, HC and Ntwaeaborwa, OM. 2012. Sensitizing effects of ZnO quantum dots on red-emitting Pr3+-doped SiO2 phosphor. Physica B, vol. 407(10), pp 1607-1610
Series/Report no.: Workflow;7878
Abstract: In this study, red cathodoluminescence (CL) ( emission=614 nm) was observed from Pr3+ ions in a glassy (amorphous) SiO2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO2:Pr3+ suggesting that the ZnO QDs transferred excitation energy to Pr3+ ions. That is, ZnO QDs acted to sensitize the Pr3+ emission. The sol–gel method was used to prepare ZnO–SiO2:Pr3+ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr3+ are discussed. In addition, the electronic states and the chemical composition of the ZnO–SiO2:Pr3+ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).
Description: Copyright: 2011 Elsevier. This is the post-print version of the work. The definitive version is published in Physica B, vol. 407(10), pp 1607-1610
URI: http://www.sciencedirect.com/science/article/pii/S0921452611009884
http://hdl.handle.net/10204/5766
ISSN: 0921-4526
Appears in Collections:National Centre for nano-structured materials
Nanotechnology
General science, engineering & technology

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