Abstract
The persistent luminescence (PersL) phosphors are excellent energy-saving and environment-friendly materials. Here, Cu nanoparticles (CuNP) were deposited on the surface of Sr2MgSi2O7:Eu2+,Dy3+ (SMS) in the CuCl2 solution by photo-reduction deposition method for the first time, the initial brightness increases 1.1 times and the light response ranges are broadened to visible light. With the increasing of CuCl2 concentration, the PersL intensity of SMS increases to its maximum and then decreases, reaches the best at 0.3 mmol/L CuCl2 solution. The changes of PersL intensity and absorption intensity indicate that CuNP can produce plasma effect (PE) on the surface of SMS, which efficiently increase the number of photo-generated electrons and holes, results more electrons can be trapped. For long afterglow materials, more electrons are captured by traps means that more electrons can be released to produce afterglow after remove the external light, thereby the PersL performance are effectively improved. In this paper, we used a simple method to improve the PersL performance of SMS and discussed the influence mechanism of CuNP in SMS. This result is attributed to the unique luminescence mechanism of long afterglow materials and the PE of CuNP. Our researches promote the application of SMS and provide a strategy for improving PersL of various long afterglow materials.
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