Journal
MATERIALS RESEARCH BULLETIN
Volume 44, Issue 9, Pages 1916-1919Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2009.05.003
Keywords
Inorganic compounds; Optical properties; Defects
Categories
Funding
- Key Science and Technology Project of Gansu Province [2GS064-A52-036-03]
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Long after glow phosphors (Ca1-xEux)(2)MgSi2O7 (0.002 <= x <= 0.02) were prepared by solid-state reactions under a weak reductive atmosphere. X-ray diffraction pattern, photoluminescence spectra, decay curve, afterglow spectra and thermoluminescence curves were investigated. The phosphors showed two emission peaks when they were excited by 343 nm, due to two types of Eu2+ centers existing in the Ca2MgSi2O7 lattice. However, only one emission peak can be found in their afterglow spectra. Energy transfer between Eu2+ ions in inequivalent sites was found. A possible mechanism was presented and discussed. The afterglow decay time of Ca1.998MgSi2O7:Eu-0.002 was nearly 12.5 h which means it was a good long lasting phosphor. (C) 2009 Elsevier Ltd. All rights reserved.
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