Plasma effect：A simple method for improving the persistent luminescence and light response range of persistent luminescent materials

Abstract

The persistent luminescent materials are important energy-saving and environmentally friendly materials used in wide application range, but the application scale is relatively small. In order to overcome the problems of narrow light response range and low persistent luminescence performance, the Ag/Sr2MgSi2O7:Eu2+,Dy3+ structure was firstly shaped by a photoreduction deposition method. The persistent luminescence performance and the photo response range are greatly improved via the plasmon resonance after the deposition of Ag on the surface of Sr2MgSi2O7:Eu2+,Dy3+. The initial brightness can be increased by a factor of 9, while the range and intensity of absorbed light are greatly changed, indicating that the plasmon resonance of Ag can be applied to persistent luminescent material, which can efficiently increase the number of photogenerated electrons and holes which will be captured and released, thereby effectively improving the afterglow performance. The influence mechanism of Ag on the generation of photogenerated electrons and holes, the number and depth of traps, and the transfer-capture-release-luminescence mechanism of photogenerated electrons and holes, namely the persistent luminescence enhancement mechanism, are revealed. The development of this research can promote the application of Sr2MgSi2O7:Eu2+,Dy3+, and meanwhile provide an effective method for improving the persistent luminescence of various persistent luminescent materials.