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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5626

Title: Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation
Authors: Mhlongo, GH
Ntwaeaborwa, OM
Swart, HC
Kroon, RE
Solarz, P
Ryba-Romanowski, W
Hillie, KT
Keywords: ZnO nanoparticles
Green-emitting ZnO nanoparticles
Issue Date: Aug-2011
Publisher: American Chemical Society (ACS)
Citation: Mhlongo, GH, Ntwaeaborwa, OM, Swart, HC, Kroon, RE, Solarz, P, Ryba-Romanowski, W and Hillie, KT. 2011. Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation. The Journal of Physical Chemistry C, vol. 115(36), pp 17625–17632
Series/Report no.: Workflow;7886
Abstract: Green-emitting ZnO nanoparticles were successfully embedded in Pr3+-doped SiO2 by a sol–gel method resulting in a red-emitting ZnO·SiO2:Pr3+ nanocomposite phosphor. The particle morphology and luminescent properties of SiO2:Pr3+ phosphor powders, with or without ZnO nanoparticles, were, respectively, investigated by electron microscopy and luminescence spectroscopy. Luminescence of SiO2:Pr3+ was studied as a function of different Pr3+ concentrations and temperature. Both Pr3+ concentration and temperature were found to influence the 1D2 emission from Pr3+ strongly. Defects emission from ZnO nanoparticles was measured at 517 nm compared with the normal peak at 470 nm from micrometer-sized ZnO powders. Only red emission at 614 nm from Pr3+ ions in SiO2:Pr3+ and ZnO·SiO2:Pr3+ was observed. The green emission from ZnO in ZnO·SiO2:Pr3+ was quenched, and the red emission from Pr3+ was doubly enhanced compared with SiO2:Pr3+. The enhancement of the PL intensity from SiO2:Pr3+ with ZnO incorporation denotes the presence of energy transfer from ZnO to Pr3+ ions.
Description: Copyright: 2011 American Chemical Society. This is an ABSTRACT ONLY.
URI: http://pubs.acs.org/doi/abs/10.1021/jp201142d
ISSN: 1932-7447
Appears in Collections:National Centre for nano-structured materials
General science, engineering & technology

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