一类电子俘获型红外可激发材料的制备和光学性质

采用硫化助熔剂法(SFM)合成了具有红外上转换及光存储特性的稀土激活光子学材料CaS:Eu,Sm和CaS:Ce,Sm.利用X射线衍射(XRD)、扫描电镜(SEM)等测试了合成材料的物相结构和微观形貌,结果表明,合成材料具有单一相,相纯度在98.5%以上;采用CaCO₃制备的合成材料晶化程度更好,生成的晶粒更大.利用荧光光谱仪和分光光度计测量了合成材料的光学性质,结果表明,这类电子俘获材料在紫外线或短波长可见光有效激发下,能通过电子俘获实现光存储,并对近红外光有上转换作用.通过对合成材料及有关稀土元素原子结构分析,提出了两种新的稀土激活剂.

PREPARATION AND OPTICAL PROPERTIES OF A KIND OF ELECTRON TRAPPING INFRARED STIMULABLE MATERIALS

A kind of novel infrared upconversion and optical storage materials such as CaS: Eu,Smand CaS: Ce, Sm has been successfully prepared by sulfurization flux method (SFM), phases andstructures identified by X-ray diffraction(XRD)appear that the synthetical materials have single phaseand the purity of phase is more than 98.5%. The grain size distribution and grain morphology obtainedby scanning electron microscope (SEM) indicate that these materials prepared by CaCO₃, have bettercrystallinity and larger grain size. Optical stimulated luminescence (OSL) measurements aremade by a fluorescence spectrometer and a spectrophotometer. It appears that this kind of opticalmaterials can realize optical storage by means of electron trapping when these materials are exposed toUV radiation or short wavelength visible light at room temperature. Stimulated by infrared radiation,these materials can transform infrared radiation into visible light. The authors put forward two kindsof activators in order to improve this kind of novel materials by means of analyzing the atornicstructure of the activators,