Spectroscopic properties and luminescence behavior of γ-irradiated Sm 3+ doped oxy-fluoride phosphate glasses

摘要

Oxy-fluoride glasses singly and co-doped with Sm 3+ ions have been synthesized of composition 30, 20 and 50mol% NaF, AlF 3 and PF 5 , respectively, was established to study the effect of both Sm 3+ ions concentrations(0.25–1mol%), and different gamma-irradiation doses on its XRD, ESR, optical transmission and photo-luminescence (PL) spectroscopy. ESR results show that, creation of defect center is suppressed by enhancing the Sm 2 O 3 content with POECs more influenced than POHCs center. This can be assumed to the competition between defect center creations and Sm 3+ ?Sm 2+ transition. We observed strong transmission band in the range 200→800nm due to charge transfer and the conversion from 6 H 5/2 state to the different excited states of the Sm 3+ ions. PL measurements reveal the coexistence of Sm 2+ and Sm 3+ ions after been irradiated and this indicates that some Sm 3+ ions were converted to Sm 2+ ions by irradiation and NBOH centers were developed. The impact of samarium oxide on ESR, transmission and PL spectral of the glasses before and after irradiation were compared and discussed with that of the undoped glass is discussed. These collective studies could justify that these oxy-fluoride glasses are suitable to be used as solid state dosimeters.