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Preparation of Non-Grinding Long Afterlow Sral2o4:eu2+,dy3+ Materials Review of preparation of Non-Grinding Long Afterlow SrAl2O4:Eu2+,Dy3+ material by Microwave Combustion MethodAbstract: The long afterglow luminescence materials commonly known as “Noctilucent powder”, is a member of photoluminescence materials. Referring to the sun and long-wave ultraviolet irradiation of light source for short periods of time, shutting down after the.