Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 147, Issue 1, Pages 386-389Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1393205
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Luminescence, excitation spectra, and decay curves of afterglow of the phosphors of CaS:Bi3+ and CaS:Eu2+, Tm3+ with and without co-doping of Na+ were investigated. It war found that co-doping monovalent ion Na+ could efficiently reduce the afterglow and the persistent time in both samples. The results imply that the trapping centers responsible for afterglow are defect-related in both samples. Based on these results, it was expected that co-doping any trivalent ions, such as Y3+ and Al3+, into CaS:Eu2+ to substitute Co2+ could produce charge defects and create trapping centers Acquisition of strong afterglow and long persistent time in CaS:Eu2+,Y3+ and CaS:Eu2+,Al3+ is a strong support for the conclusion. (C) 2000 The Electrochemical Society. S0013-4651(99)08-002-7. All rights reserved.
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