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Lithium niobate (LiNbO 3 ) crystals doped with chromium ions show a clear green colouring reflecting the absorption profile of the dominating [Cr] Li defect centres. A significant change in its colouration takes place when it is co-doped with other valency impurities such as Mg 2+ , Sc 3+ and W 6+ , above a certain threshold concentration. This concentration...
Luminescence of natural sillimanite Al 2 SiO 5 was studied by a laser-induced time-resolved technique combined with absorption spectroscopy. It was found that two red broad emission bands are connected to Fe 3+ and Cr 3+ luminescence centers. Chromium participation in luminescence was proved by the study of synthetic sillimanite activated by Cr. Several narrow emission...
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