Journal
OPTICAL MATERIALS
Volume 33, Issue 11, Pages 1781-1785Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2011.06.015
Keywords
Persistent energy transfer; Thermoluminescence; Long-lasting phosphor
Categories
Funding
- National Natural Science Foundation of China [10874061]
- National Science Foundation for Distinguished Young Scholars [50925206]
- Research Fund for the Doctoral Program of Higher Education [200807300010]
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Eu2+, Mn2+ and Dy3+ co-doped long-lasting phosphors Sr3MgSi2O8 were prepared by a solid-state reaction under a reductive atmosphere. Fluorescence spectra demonstrated that the weak red emission resulting from the forbidden transition of Mn2+ could be enhanced by the energy transfer from Eu2+ to Mn2+. The energy transfer between Eu2+ and Mn2+ was systematically investigated. The phosphorescence spectra revealed that Eu2+ could persistently transfer its energy to Mn2+ after removing the excitation source. The duration of Mn2+ can prolong to more than 2 h. The thermoluminescence spectra were used to characterize the ability of the trap to trapping the carriers. By the analysis of the ionization potentials, the roles of Mn2+ and Dy3+ in the afterglow process were discussed. A possible afterglow mechanism was presented and discussed. (C) 2011 Elsevier B.V. All rights reserved.
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