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Study on Luminescence of KCl:Eu2+ Crystals after X-ray Irradiation at Room Temperature

1
Department of Mechanical Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
2
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 331; https://doi.org/10.3390/cryst9070331
Received: 8 May 2019 / Revised: 24 June 2019 / Accepted: 27 June 2019 / Published: 28 June 2019
(This article belongs to the Special Issue Defects in Crystals)
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Abstract

Bleaching with the F-light at the excitation bandpass of 20 nm results in the phenomenon that F-centre peak and thermoluminescence (TL) glow peaks due to Fz- and F-centres identically decrease with the F-bleach time, whereas TL glow peak due to Fz-centre only remains almost constant irrespective of its time in the case of that at the excitation bandpass of 5 nm. Analysing the data on bleaching effects, absorption spectrum of X-ray irradiated KCl:Eu2+ crystal has a peak due to Fz-centre approximately within 20 nm of the wavelength 560 nm at F-centre peak. Electrons released from Fz-centres at 370 K and from F-centres at 450 K combine with Eu3+ ions, leading to the excited Eu2+ ions from which the luminescence at 420 nm is emitted. View Full-Text
Keywords: X-ray irradiation; thermoluminescence; colour centre; F-bleach; thermal-bleach X-ray irradiation; thermoluminescence; colour centre; F-bleach; thermal-bleach
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Kohzuki, Y.; Ohgaku, T. Study on Luminescence of KCl:Eu2+ Crystals after X-ray Irradiation at Room Temperature. Crystals 2019, 9, 331.

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