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Optical spectroscopy and thermoluminescence of electrolytically colored KCl:Tl+ crystals

S. POLOSAN1,* , M. ENCULESCU1, M. SECU1, E. APOSTOL1

Affiliation

  1. National Institute for Materials Physics, Bucharest-Magurele, PO BOX MG-7, 77125 ROMANIA

Abstract

The paper presents the spectroscopic properties of electrolytic colored KCl:Tl and KCl:Tl+Ca crystals and the assignments of the new defects which are formed during electron injection process. The new formed defects Tlo and Tlo +Ca2+ with the metal in the anionic sites, presents very high photoluminescence properties in the near infrared region. Together with those centers, the F-centers, their aggregates and the holes centers are formed during electrolytic coloring process. Their properties were studied by optical absorption (OA), photoluminescence (PL) and thermoluminescence (TL) measurements and compared with those obtained by ionizing irradiation in uncolored KCl:Tl crystals. The results suggest a more efficient Tl+→Tlo process in the case of Ca2+ codoped samples due to the prolonged time of electrons injection, low temperature and high electric field..

Keywords

Photoluminescence, Electrolytic coloring, Near infrared emission, Thermoluminescence.

Submitted at: Sept. 1, 2008
Accepted at: Nov. 11, 2008

Citation

S. POLOSAN, M. ENCULESCU, M. SECU, E. APOSTOL, Optical spectroscopy and thermoluminescence of electrolytically colored KCl:Tl+ crystals, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 3008-3011 (2008)