9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Comparative study of luminescence properties of Eu<sup>2+</sup>, Dy<sup>3+</sup> and Tm<sup>3+</sup> co-doped CaAl<sub>2</sub>O<sub>4</sub> powder phosphors

12 Jul 2012, 11:00
Oral Presentation Track A - Division for Condensed Matter Physics and Materials DCMPM1


Dr Mokhotjwa Simon Dhlamini (University of South Africa)

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Abstract content <br> &nbsp; (Max 300 words)

Preparation of Eu2+, Dy3+ and Tm3+ ions co-doped CaAl2O4 phosphor powders by combustion method is reported. The morphology and particle size, and crystal structure of the CaAl2O4 host were confirmed by field emission scanning electron microscopy (FESEM) and X-ray diffractometer (XRD), respectively. Ultraviolet, visible (UV/VIS) and cathodoluminescence measurements were carried out in order to investigate the optical properties of the powder phosphors. Blue emission at 440 nm from Eu2+ excited with He-Cd laser for all systems was measured. No emission from Dy3+ and Tm3+ ions were measured. Excitation with Auger electron spectroscopy (AES) showed emission from Tm3+ (at 458 nm and 470 nm) and Dy3+ (at 571 nm and 477 nm) dominating the emission from Eu2+ ions. The emission intensities of the different systems were compared. Different excitation energies (wavelengths) using the spectrophotometer equipped with xenon lamp were used to excite the powders and the observed change in the shape of the emission spectra is reported.

Key words: Cathodoluminescence, Photoluminescence, Combustion, Blue emission

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Primary author

Dr Mokhotjwa Simon Dhlamini (University of South Africa)


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