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Browsing by Subject "Cathodoluminescence"

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Concentration effect of Tm3+ on cathodoluminescence properties of SiO2: Tm3+ and SiO2:Ho3+, Tm3+ systems

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Ntwaeaborwa, OW ; Hillie, KT Date: May 2012 Cathodoluminescence (CL) properties of SiO2 powders activated with thulium (Tm3+) and holmium (Ho3+) ions prepared by a sol–gel process were investigated. Different molar concentrations of Tm3+ co-doped with Ho3+ were studied. The 460 nm ... Read more
Effects of Ce3+ concentration, beam voltage and current on the cathodoluminescence intensity of SiO2: Pr3+–Ce3+ nanophosphor

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Dhlamini, MS ; Swart, HC ; Hillie, KT Date: Feb 2011 SiO2:Pr3+–Ce3+ phosphor powders were successfully prepared using a sol–gel process. The concentration of Pr3+ was fixed at 0.2 mol% while that of Ce3+ was varied in the range of 0.2–2 mol%. High resolution transmission electron microscopy ... Read more
Energy transfer between doubly doped Er3+, Tm3+and Ho3+ rare earth ions in SiO2 nanoparticles

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Hillie, KT Date: Apr 2011 Preparation of Er3+, Ho3+ and Tm3+ ions co-doped SiO2 nanoparticle phosphor powders by sol gelmethod is reported. The morphology and the particle size of the SiO2 hostmatrix were confirmed by field emission scanning electron microscopy (FESEM). ... Read more
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
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

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Browsing by Subject "Cathodoluminescence"

Browsing by Subject "Cathodoluminescence"

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