Scintillation properties of PbWO4 crystals doped with the rare-earth ions

摘要

In PbWO4(PWO) crystals grown by Czochralski method the influence of atmosphere of the growth (02, air) and doping with the rare-earth ions of different types (A(3+) = Lu3+, Gd3+, Tb3+, Eu3+ as well as doubly doped A(3+)-Li+) on light yield and luminescence decay were analyzed. PWO scintillator with the ultra-fast (tau = 0.5 ns) main component of luminescence decay (87% of total light yield) was obtained using the O-2-growth atmosphere and doping by Eu2O3 at a concentration of 5000 ppm. It is concluded that the decrease of decay constant of the main scintillation component is the result of the resonant energy transfer between the centers of "blue" PWO luminescence (lambda(max) = 420 nm) and the 4f-4f-transitions of Eu3+ ions in this spectral region. (C) 2004 Elsevier Ltd. All rights reserved.