Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1810746 | Physica B: Condensed Matter | 2012 | 4 Pages |
Abstract
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 460Â nm peak was monitored and the influence of the beam energy and concentration of Tm3+ ions on the emission properties of this peak was also monitored. The peculiar behavior whereby the 460Â nm emission peak decreases and the increase in the 705 and 865Â nm peaks with the increase in the concentration of Tm3+ ions is reported. The relationship between the accelerating beam voltage and the CL intensity of the blue emission peak (460Â nm peak) is established. Morphology, particle size and optical properties were characterized with Scanning electron microscopy (SEM), UV/VIS Lambda 750Â S spectrometer and Auger electron spectroscopy (AES) equipped with Ocean Optics S2000, respectively.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
M.S. Dhlamini, G.H. Mhlongo, H.C. Swart, O.M. Ntwaeaborwa, K.T. Hillie,