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Red photoluminescence and purple color of naturally irradiated fluorite

Gaft, M. and Waychunas, G. A. and Rossman, G. R. and Nagli, L. and Panczer, G. and Cheskis, D. and Raichlin, Y. (2020) Red photoluminescence and purple color of naturally irradiated fluorite. Physics and Chemistry of Minerals, 47 (11). Art. No. 46. ISSN 0342-1791. doi:10.1007/s00269-020-01116-4.

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Natural radiation-induced red fluorescence of fluorite consists of two broad bands at 750 and 635 nm with very short decay times of 20.3 and less than 5 ns, respectively. The first one is connected to an M center compensated by Na, while the second is connected to an M⁺ center, possibly formed as result of the M center’s destruction by UV irradiation. The optically active centers in naturally irradiated fluorite responsible for red luminescence and purple color are different from one another. The most probable reason for the purple color is colloidal calcium and not the M_(Na) center.

Item Type:Article
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Gaft, M.0000-0002-5149-2098
Rossman, G. R.0000-0002-4571-6884
Additional Information:© 2020 Springer Nature. Received 30 June 2020. Accepted 03 October 2020. Published 15 October 2020. The authors express their gratitude to Dr. Naomi Porat and Dr. Eugenii Zakon from Geological Survey of Israel for thermoluminescence and Q-ICPMS data.
Subject Keywords: Fluorite; Luminescence; Natural irradiation; Purple color; M center; Na
Issue or Number:11
Record Number:CaltechAUTHORS:20201015-152732512
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Official Citation:Gaft, M., Waychunas, G.A., Rossman, G.R. et al. Red photoluminescence and purple color of naturally irradiated fluorite. Phys Chem Minerals 47, 46 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106087
Deposited By: George Porter
Deposited On:16 Oct 2020 18:57
Last Modified:16 Nov 2021 18:50

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