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Browsing by Author "Ntwaeaborwa, OM"

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The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+/Tb3+

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Ntwaeaborwa, OM ; Swart, HC ; Hillie, KT Date: Jul 2011 Tb3+-Pr3+, and Eu3+-Pr3+ ion pairs co-doped in a SiO2 matrix were prepared by a sol-gel method. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 resulted in the quenching of Eu3+ and Tb3+ emissions with increasing Pr3+ concentrations. The ... Read more
Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Swart, HC ; Kroon, RE ; Solarz, P ; Ryba-Romanowski, W ; Hillie, KT Date: Aug 2011 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 ... Read more
Luminescent properties and quenching effects of Pr3+ co-doping in SiO2:Tb3+/Eu3+ nanophosphors

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Ntwaeaborwa, OM ; Swart, HC ; Hillie, KT Date: Feb 2014 Luminescence properties of Pr(sup3+) single doped SiO2 and Pr(sup3+) co-doped SiO(sub2):Tb(sup3+)/Eu(sup3+) nanophosphors synthesized using sol–gel method were investigated. X-ray diffraction (XRD), and scanning electron microscope (SEM) were ... Read more
Luminescent, magnetic and optical properties of ZnO-ZnS nanocomposites

Author: Raleaooa, PV ; Roodt, A ; Mhlongo, Gugu H ; Motaung, David E ; Kroon, RE ; Ntwaeaborwa, OM Date: Feb 2017 The structure, particle morphology, optical and magnetic properties of ZnO, ZnS and ZnO-ZnS nanoparticles prepared by the sol-gel method are reported. ZnO and ZnS were combined at room temperature by an ex situ synthetic route to prepare ... Read more
Photoluminescence studies of green emitting BaB8O13: Bi3+ phosphors prepared by solution combustion method

Author: Lephoto, MA ; Tshabalala, KG ; Motloung, SJ ; Mhlongo, Gugu H ; Ntwaeaborwa, OM Date: Aug 2018 Undoped and bismuth (Bi(sup)3+)-doped barium octaborate (BaB(sub)8O(sub)13) powder phosphors were synthesized by solution combustion method. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, UV–visible ... Read more
Sensitizing effects of ZnO quantum dots on red-emitting Pr3+-doped SiO2 phosphor

Author: Mbule, PS ; Mhlongo, Gugu H ; Pitale, SS ; Swart, HC ; Ntwaeaborwa, OM Date: May 2012 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 ... Read more
A study on the sensing of NO(sub2) and O(sub2) utilizing ZnO films grown by aerosol spray pyrolysis

Author: Mhlongo, Gugu H ; Motaung, DE ; Kortidis, I ; Mathe, Ntombizodwa R ; Ntwaeaborwa, OM ; Swart, HC ; Mwakikunga, Bonex W ; Ray, SS ; Kiriakidis, G Date: Jul 2015 The present paper addresses the preparation and characterization of ZnO nanostructured thin films obtained using aerosol spray pyrolysis method at different deposition periods. Aiming at understanding the chemical composition, structural and ... Read more

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Browsing by Author "Ntwaeaborwa, OM"

Browsing by Author "Ntwaeaborwa, OM"

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