黄色荧光粉Sr3SiO5:Eu2+相转变机理

Sr3SiO5:Eu2+ yellow phosphors were synthesized through the high temperature solid state reaction method under a reductive atmosphere. Impurity phase Sr2SiO4:Eu2+ acts as the phase and significantly affects the photoluminescence and afterglow properties of Sr3SiO5:Eu2+ yellow phosphors. In the synthetic process, the phase transformation process and kinetic process were investigated by DTA\TG, tabletting, combustion and XRD patterns. It is indicated that the thermal field between raw materials and the crucible is responsible for the impurity phase. In the synthesis process, at around 1 200 ℃, the area where the raw materials are in contact with the crucible can be regarded as the interface of two different components, and thus, the synthesis of Sr2SiO4:Eu2+ firstly occurred in the interface and generated product layer Sr2SiO4:Eu2+. Further reaction occurs when more raw materials diffuse through the interface. Finally, Sr3SiO5:Eu2+ yellow phosphors will be synthesized at higher temperatures, and the impurity phase was therefore formed.