紫外应力发光材料SrMgSi_2O_6:Ce的制备与光谱性质研究

Ultraviolet Mechanoluminescence from SrMgSi_2O_6:Ce

采用固相烧结法制备了3种紫外应力发光材料SrMgSi2O6:Ce0.005、SrMgSi2O6:Ce0.005,Er0.015和Sr2MgSi2O7:Ce0.005,Er0.015。XRD测试结果表明:SrMgSi2O6与Sr2MgSi2O7具有相同的结构,掺杂离子的加入没有改变相结构。3种样品的荧光发射光谱很类似,均在330～400 nm紫外波段有较宽的发射谱带。应力发光曲线的测试结果表明,样品的应力发光强度与物体受力变化呈良好的对应关系,证明所制备的样品可以用来检测物体的受力情况。同时,研究了共掺杂离子以及改变基质结构对应力发光强度的影响,结果表明发光体中陷阱数目的增加以及基质对称性的降低有利于应力发光的产生。由于所开发的样品波长在紫外区,因而可以作为光源来激发其他颜色的光致发光材料从而实现多颜色应力发光材料的开发。

UV mechanoluminescent(ML) phosphors SrMgSi2O6:Ce0.005,SrMgSi2O6:Ce0.005,Er0.015 and Sr2MgSi2O7:Ce0.005,Er0.015 were prepared via solid state reaction.The XRD results indicate that the structure of SrMgSi2O6 is identical to that of Sr2MgSi2O7,which has a tetragonal symmetry with a space group P421m.The emission bands of three samples are similar,which consist of a broad band with two peaks centered at 349 and 371 nm,caused by the f-d electron transition of Ce3 + ions.The ML results show that the ML intensities of these samples are well depended on the stress,indicating that these ML materials can be potentially used as sensors to detect the stress distribution of an object.Furthermore,the ML intensity of SrMgSi2O6:Ce0.005,Er0.015 is obviously higher than those of SrMgSi2O6:Ce0.005 and Sr2MgSi2O7:Ce0.005,Er0.015.The obtained results suggest that the trap and the worse symmetry of crystal structure are responsible for the higher ML intensity of SrMgSi2O6:Ce0.005,Er0.015.Because of the UV emission of this material,it can be used as the excitation source to irradiate other color phosphors and then the various colors ML can be realized.