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Time-resolved luminescence spectroscopy of Eu2+ in BaFCl:Eu2+ X-ray storage phosphor

M. SECU1, C. E. SECU1, V. VASILE1,* , D. PREDOI1, D. M. GAZDARU2

Affiliation

  1. National Institute of Materials Physics, PO Box MG-7 Bucharest-Magurele, Romania
  2. aFaculty of Physics, University of Bucharest, PO Box MG-11 Bucharest-Magurele, Romania

Abstract

Photoluminescence (PL) spectra recorded at room temperature (RT) in polycrystalline BaFCl:Eu2+ X-ray storage phosphor have shown the europium associated luminescences, a broad luminescence band at 385nm (3.22eV) with a 3.3±0.1μs PL lifetime accompanied by a luminescence line at about 368nm (3.37eV). The energy difference ΔEB-L=226cm-1 between the two excited levels from which the europium associated band and line luminescences took place was computed. An additional broad luminescence band at about 425nm (2.92eV) with 0.7±0.1μs PL lifetime has been attributed to the europium luminescence perturbed by an impurity. Time resolved spectroscopy measurements have shown that no other impurity luminescences (like oxygen-vacancy centres) can be observed at RT except the europium associated ones..

Keywords

X-ray storage phosphors, Luminescence, Europium, BAFCl:Eu2+.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

M. SECU, C. E. SECU, V. VASILE, D. PREDOI, D. M. GAZDARU, Time-resolved luminescence spectroscopy of Eu2+ in BaFCl:Eu2+ X-ray storage phosphor, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1800-1802 (2007)