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Laser-induced time-resolved luminescence of natural sillimanite Al2SiO5 and synthetic Al2SiO5 activated by chromium

by: M. Gaft, W. Strek, L. Nagli, G. Panczer, G. R. Rossman, L. Marciniak
Journal of Luminescence, Vol. 132, No. 11. (November 2012), pp. 2855-2862, doi:10.1016/j.jlumin.2012.04.045  Key: citeulike:10850083

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Abstract

Luminescence of natural sillimanite Al2SiO5 was studied by laser-induced time-resolved technique combined with absorption spectroscopy. It was found that two red broad emission bands are connected to Fe3+ and Cr3+ luminescence centers. Chromium participation in luminescence was proved by the study of artificial sillimanite activated by Cr. Several narrow emission lines have been found which were preliminary ascribed to Mn4+ and V2+ luminescence centers. ⺠We studied luminescence centers in natural sillimanite by time-resolved technique ⺠We proved Cr3+ emission by the study of artificial sillimanite activated by Cr ⺠We proved that broad red emission band with long decay is connected to Fe3+ ⺠We substantiate that narrow emission lines are connected to Mn4+ and V2+.


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