12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Effects of ZnO and Ce3+ incorporation on the photoluminescence and cathodoluminescence intensity of Pr3+ doped SiO2.

Presented by Ms. Gugu MHLONGO on 14 Jul 2011 from 12:00 to 12:15
Type: Oral Presentation
Session: CMPMS1
Track: Track A - Condensed Matter Physics and Material Science


<p>The successful incorporation of ZnO nanoparticles and Ce3+ ions in Pr3+ doped SiO2 using a sol-gel process is reported. SiO2:Pr3+ gels, with or without ZnO and Ce3+, were dried at room temperature and annealed at 600 oC. The Field Emission Scanning Electron Microscopy (FESEM) indicated clustered SiO2 nanoparticles with with particle size diameter ranging between 20 to 120 nm while the high resolution transmission electron microscopy (HRTEM) revealed and energy dispersive x-ray spectroscopy (EDS) the presence of Zn, Ce, and Pr nanoclustures enveloped in SiO2 matrix.. The emission intensity from SiO2:Pr3+-Ce3+ was slightly enhanced compared to single doped SiO2:Ce3+. For ZnO.SiO2:Pr3+, the ZnO green emission was suppressed and enhanced emission from Pr3+ was observed. Energy transfer mechanism between Pr3+and Ce3+ as well as between ZnO and Pr3+ ¬ is discussed in detail.

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Room: Parthenon

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