Red photoluminescence and purple color of naturally irradiated fluorite

M. Gaft; G. A. Waychunas; G. R. Rossman; L. Nagli; G. Panczer; D. Cheskis; Y. Raichlin

doi:10.1007/s00269-020-01116-4

Red photoluminescence and purple color of naturally irradiated fluorite

M. Gaft, G. A. Waychunas, G. R. Rossman, L. Nagli, G. Panczer, D. Cheskis, Y. Raichlin

Department of Physics

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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.

Original language	English
Article number	46
Journal	Physics and Chemistry of Minerals
Volume	47
Issue number	11
DOIs	https://doi.org/10.1007/s00269-020-01116-4
State	Published - 1 Nov 2020

Keywords

Fluorite
Luminescence
M center
Na
Natural irradiation
Purple color

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title = "Red photoluminescence and purple color of naturally irradiated fluorite",

abstract = "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{\textquoteright}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 MNa center.",

keywords = "Fluorite, Luminescence, M center, Na, Natural irradiation, Purple color",

author = "M. Gaft and Waychunas, {G. A.} and Rossman, {G. R.} and L. Nagli and G. Panczer and D. Cheskis and Y. Raichlin",

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AU - Gaft, M.

AU - Waychunas, G. A.

AU - Rossman, G. R.

AU - Nagli, L.

AU - Panczer, G.

AU - Cheskis, D.

AU - Raichlin, Y.

PY - 2020/11/1

Y1 - 2020/11/1

N2 - 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 MNa center.

AB - 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 MNa center.

KW - Fluorite

KW - Luminescence

KW - M center

KW - Na

KW - Natural irradiation

KW - Purple color

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Red photoluminescence and purple color of naturally irradiated fluorite

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