New color centers in short-wave range in sodium and lithium fluorides

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Abstract

The formation mechanism of luminescence centers in short-wave range (400—500 nm) in LiF crystals is investigated. It is established, that the investigated centers are own crystal defects created in the result of the radiation-thermal process. The offered model of the center is realized in a NaF crystal. It is revealed, that in sodium fluoride the new centers allow to obtain short-wave luminescence in yellow-green range.

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About the authors

N. T. Maksimova

Irkutsk State University

Author for correspondence.
Email: Natmax_2001@mail.ru
Russian Federation, Irkutsk

D. D. Miroshnik

Irkutsk State University

Email: Natmax_2001@mail.ru
Russian Federation, Irkutsk

A. I. Evdokimova

Irkutsk State University

Email: Natmax_2001@mail.ru
Russian Federation, Irkutsk

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Supplementary files

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2. Fig. 1. Absorption (a) and luminescence (b) spectra of the blue range in LiF crystals. 1 — excitation, 2 — emission.

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3. Fig. 2. Absorption spectra of color centers in LiF crystals irradiated with gamma quanta at different temperatures. (a) 300 K, (b) 77 K, (c) 1 — 217–253 K, 2 — 440–580 K. Exposure dose of irradiation — 5 103 C kg−1.

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4. Fig. 3. Absorption spectra (a), (c) and luminescence spectra (b) of color centers in Li F crystals (a) 1 — LiF-O, OH after gamma-ray irradiation; 2 — LiF-O, OH after heat treatment; (b) 1 — luminescence of LiF-O, OH before heat treatment, 2 — after heat treatment; (c) absorption spectra at the boiling point of liquid nitrogen, 1 — R2 band, 2 — band of blue glow centers.

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5. Fig. 4. Samples of LiF (a) and NaF (b) crystals with characteristic short-wave luminescence, excitation 365 nm.

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