Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5404397 | Journal of Luminescence | 2006 | 9 Pages |
Abstract
Influence of doping with Bi3+ ions and Bi3+-Na+ or Bi3+-Li+ ions pairs on luminescence, emission kinetics and light yield of CaWO4 crystals has been investigated. It has been shown that under excitation in the A-band at 272 and 287 nm, related to the Bi3+ ions absorption, the luminescence peaked at 468 nm decaying with time Ï=0.41 μs is observed. For bismuth concentration 50-500 ppm and the equimolar concentrations of the Bi3+ ions accompanied by Na+ or Li+ ions compensators the significant suppression of the phosphorescence peaked at 520 nm, related to the defect WO3-VO complex, and an improvement of scintillation characteristics of the CaWO4 are noticed. Energy transfer from the defect WO3-VO and regular WO42â oxy-anions to Bi3+ ions have been observed at room temperatures and discussed.
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Physical and Theoretical Chemistry
Authors
Yu. Zorenko, M. Pashkovsky, A. Voloshinovskii, B. Kuklinski, M. Grinberg,