采用高温固相法在800℃下制备出系列白色长余辉荧光粉Sr_3Al_2O_5Cl_2∶Eu~(2+),Tm~(3+),并研究了它们的结构、形貌及发光性能。样品Sr_(2.91)Al_2O_5Cl_2∶0.04Eu~(2+),0.05 Tm~(3+)具有单一晶相和纳米纤维结构。该样品在紫外光激发下表现出两个很强的宽带发射(分别位于~448 nm和~590 nm)。它的余辉寿命大约是20 min。利用此种荧光粉所制作出的白光LED器件表现出很强的白光发射。 A series of white long persistence phosphors Sr_3Al_2O_5Cl_2:Eu ~ (2 +) and Tm ~ (3 +) were prepared by high temperature solid-state reaction at 800 ℃. Their structures, morphologies and luminescence properties were also studied. The samples Sr_ (2.91) Al_2O_5Cl_2: 0.04Eu ~ (2 +) and 0.05 Tm ~ (3 +) have single crystal phase and nanofiber structure. The sample exhibits two very strong broadband emissions (~ 448 nm and ~ 590 nm, respectively) under UV excitation. Its afterglow life is about 20 min. The white LED device fabricated by using this kind of phosphor shows strong white light emission.