高温高压合成的硅酸锶铕铋的发光特性

用高温高压方法合成了Ｓｒ２ＳｉＯ４：Ｅ３＋ｕ，Ｂｉ３＋和ＳｒＳｉＯ３：Ｅｕ３＋，Ｂｉ３＋研究了合成压力对其发光性能的影响，与用溶胶－凝胶共沉淀法和常压高温法合成的产品作比较．常压制备的ＳｒＳｉＯ３：Ｅｕ３＋，Ｂｉ３＋为六角结构，而在２．３４—４．１０ＧＰＳ的合成压力范围内，它转变为反正交结构；常压下Ｓｒ２ＳｉＯ４：Ｅｕ３＋，Ｂｉ３＋为单斜结构，在４．２ＧＰａ的合成压力下，未发现其结构相变．高压合成产物的发光强度和相对量子发光效率降低，半宽度明显增加，且伴有红移发生．发光强度的改变是压致晶场的变化引起的

THE LUMINESCENCE CHARACTERISTICS OF EUROPIUM ACTIVATED STRONTUM SILICATE SYNTHESIZED AT HIGH TEMPERATURE AND HIGH PRESSURE

he Sr2SiO4:Eu3+,Bi3+;SrSiO3: Eu3+, Bi3+ samples were synthesized at high temperature and high pressure.The effect of high pressure on the structure and luminescence properties of samples were studied. For the comparison,the samples were also prepared by the method of Sol-Gel and high temperature at atmospheric pressure.The SrSiO3:Eu3+,Bi3+ prepared at atmosphere has a hexagonal phase structure;in the pressure range of 2.34-4.10GPa, it transforms into a pseudo-orthorhomic structure(monoclinic),and in the pressure range to 4.15GPa the structure change of Sr2SiO4:Eu3+, Bi3+ has not been observed,it maintains the monoclinic structure of samples synthesize under atmospheric pressure.High pressure makes the luminescence properties of samples change obviously.Intensity and relative quantum lumineseceny efficiency decrease,half-width increases obviously and red shift occures.The changes of the luminescence properties is result from the pressure-induced changes of crystal structure.