Photoluminescence with quasi-white spectrum in LiF-UO2 crystals with color centers

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Abstract

We study of spectral characteristics of LiF-UO2 crystals with radiation induced color centers and their stability under action of emission of blue light emitting diode. The luminescence band with bandwidth 500—750 nm was observed upon excitation by blue light emitting diode emission. This indicates the possibility of using LiF crystals, containing uranium and radiation induced color centers (F2, F3+), as a phosphor, that possesses high stability due to special radiation treatment, for white light sources.

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About the authors

L. I. Shchepina

Irkutsk State University

Author for correspondence.
Email: schepina@api.isu.ru
Russian Federation, Irkutsk

N. A. Ivanov

Irkutsk National Research Technical University

Email: schepina@api.isu.ru
Russian Federation, Irkutsk

V. A. Erofeeva

Irkutsk State University

Email: schepina@api.isu.ru
Russian Federation, Irkutsk

L. I. Ruzhnikov

Irkutsk State University

Email: schepina@api.isu.ru
Russian Federation, Irkutsk

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2. Fig. 1. Absorption spectra in the visible region of the spectrum of LiF-UO2 crystals of the first (1) and second type (2): before irradiation (a); after X-ray irradiation for 20 min at CT (b); difference spectrum, minus the M absorption band (c). The thickness of the first sample is 3.62; of the second sample, 1.52 mm

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3. Fig. 2. Photoluminescence spectra of LiF-UO2 crystals of the first (1, 3) and second type (2, 4): before irradiation (4); after X-ray irradiation for 20 min at CT (1, 2); and additional irradiation at reduced temperature (3)

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