The preparation and functional studies of the porous long afterglow luminescent materials

As a kind of energy storage materials, the long afterglow luminescent material is used in many application fields. In this paper, the pore-forming agent of ammonium bicarbonate is added in the raw material, and the simple high temperature solid state method is adopted to prepare the long persistence luminescent materials with different pore structures. All the long afterglow materials are the series of Sr2MgSi2O7: Eu2+, Dy3+, where the photoluminescence spectrum is the characteristic curve of the Eu2+ with the emission peak located around 465 nm. The pore diameter increases with the increase of the amount of pore-forming agent, which reaches the maximum with the size of 10–200 μm when the mass content of ammonium bicarbonate is 50%, accompanied by the result that the afterglow performance is improved by more than 72%. All the hole wall is composed of grains. The epoxy resin was used as the filling agent, provided light channels in the porous long persistence luminescent materials, and the afterglow performance could be improved by more than 40%. The initial intensity increases from 3.56 cd/m2 (without pore-forming agent) to 9.51 cd/m2. It provides an effective way for the application of long afterglow luminescence materials.