研究了SrAl2O4:Eu,Dy发光粉的机械余辉与机械劣化现象.结果表明,机械余辉强度与所施加的机械压力的大小及稀土掺杂离子的浓度有关.发光粉所受机械压力越大,掺杂Dy3+浓度越高,机械余辉强度越高;掺杂Eu2+浓度的变化,对机械余辉影响较小.从机械劣化研究结果可知,机械外力会导致荧光劣化和余辉劣化,而且后者总是先于前者发生.另外还对机械余辉与机械劣化机制进行了探讨,提出机械余辉是由机械能转化而来的热能将陷阱捕获的电子和空穴激发,二者复合导致发光;机械劣化是由于机械外力破坏了晶体结构,而且率先破坏晶格畸变严重的部分(包含Dy3+或空位的部分).
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