Laser-induced time-resolved luminescence of natural sillimanite Al2SiO5 and synthetic Al2SiO5 activated by chromium
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. âº We studied luminescence centers in natural sillimanite by time-resolved technique âº We proved Cr3+ emission by the study of artificial sillimanite activated by Cr âº We proved that broad red emission band with long decay is connected to Fe3+ âº We substantiate that narrow emission lines are connected to Mn4+ and V2+.