Abstract
A series of long afterglow luminescent materials (Ca,Sr)2MgSi2O7:Eu2+,Dy3+ doped with R+ (R+ = Li+, Ag+, K+ respectively) was synthesized by the high temperature solid-state reaction method. Crystal structure and luminescent properties were analyzed by X-ray diffraction (XRD), photoluminescence (PL), decay curves and thermoluminescence (TL) curves. The results show that the addition of ions has no effect on the crystal structure type and the position of the emission peak. However, the incorporation of doping ions has a great impact on the crystal field environment of the luminescent center. The introduction of R+ ions increases the number of shallow traps, reduces the number of deep traps, improves the initial brightness and the brightness decrease during slow decay. At higher Dy3+ doping level, more deep traps are introduced to these materials, and it effectively improve the brightness of the slow decay process. The mechanism of afterglow in the (Ca,Sr)2MgSi2O7:Eu2+,Dy3+,R+ materials is discussed.
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