Abstract
Long afterglow phosphors (Ca 1− x Eu x ) 2MgSi 2O 7 (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 Eu 2+ centers existing in the Ca 2MgSi 2O 7 lattice. However, only one emission peak can be found in their afterglow spectra. Energy transfer between Eu 2+ ions in inequivalent sites was found. A possible mechanism was presented and discussed. The afterglow decay time of Ca 1.998MgSi 2O 7:Eu 0.002 was nearly 12.5 h which means it was a good long lasting phosphor.
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