Radiation-induced luminescence centres in Sm:MgF2 ceramics

[摘要] We have prepared Sm:MgF2 ceramics by the spark plasma sintering technique and studied the radio-photo-luminescence (RPL) properties. RPL is a phenomenon seen in selected phosphors in which a new photoluminescence (PL) emission centre is generated by ionizing radiations such as X-rays. In the present system, RPL is observed with two different emissions in the blue and near infrared (NIR) ranges due to M(C-2h) and M(C-1) centres. The dynamic range using the former centre is in the high dose range above 100 Gy while the former centres have a sensitivity below 100 Gy. In addition, heat-treating an irradiated 0.01%Sm:MgF2 sample induces the reduction of the Sm3+-ion, i.e. Sm3+ -> Sm2+). These centres are metastable, and their concentration can be increased or decreased by heat-treatment and exposing to UV light.

[发布日期] 2018-11-15

[效力级别]  Proceedings Paper

[关键词] Radio-photoluminescence;RPL;MgF2;Sm;Dosimeter;X-rays