制备了Y2SiO5∶Pr3+上转换发光材料, 首次实现了太阳光激发下的UVC(220~280 nm)紫外上转换发射。为检测紫外(UVC)上转换发光材料的灭菌效果,从土壤中筛选出铜绿假单胞菌并进行培养。为了便于观察, 使用Syto9/PI染色剂对细菌着色。实验结果显示: 经过太阳光照射后, 附着上转换材料的细菌的死亡率比没有上转换材料的细菌有明显的上升。这说明在太阳光的照射下, 上转换材料能够将太阳光转化为紫外线并有效灭菌。

UVC (220-280 nm) up-conversion(UC) emission was achieved for the first time under the sunlight. To test UC UVC germicidal efficacy of Pr3+ doped Y2SiO5 phosphors, the verdigris pseudomonad were extracted from soil and used for the experiments. The bacteria were stained by Syto9/PI. Experiment results show that the mortality rate of bacteria adheres to UC phosphor increases markedly under sunlight radiation. It indicates that UC UVC materials can effectively kill bacterium under the sunlight.