Synthesis and luminescence properties of KMgF3:Tm3+ fluoroperovskite

L. PEREZ CRUZ; E.CRUZ-ZARAGOZA; J. MARCAZZÓ; J.M. HERNANDEZ; H. MURRIETA

León

Congreso; XV International Symposium on Solid State Dosimetry (ISSSD); 2015

Universidad de Guanajuato

In this work we present the synthesis of the KMgF3 binary compound doped with different concentrations (0.05, 0.1, 0.2, 0.5 and 1.0 mol %) of thulium (Tm3+) ions. The characterization of the powder material was carried out by DRX, Scanning Electronic Microscopy and by semi-quantitative EDS analysis. The dosimetric property of the powder and chips with Teflon samples was studied by thermoluminescence (TL) and radioluminescence (RL) phenomena. The TL response as a function of the given dose was analyzed in the range between 0.5 Gy and 2500 Gy and a good linear response was obtained. The glow curves of KMgF3:Tm present three glow peaks, the first peak was observed between 97-100 °C, the second one was about 146-150 °C, and the third peak at 310-320 °C range temperature. The maximum of the glow curves shifted to high temperature when the fluoroperovskites were agglomerates with Teflon as chips samples. The reproducibility of the TL signal was tested and less than 5 % was obtained. The TL signal decay was analyzed during a period of 33 days. Furthermore, the glow curve structure was studied by the thermal bleaching at 100 Gy gamma dose and the kinetics parameters values were obtained by a deconvolution process. On the other hand, the RL response of different concentrations of thulium under beta irradiation was studied and the maximum of light output has been obtained for KMgF3 fluoroperovskite doped with 0.5 mol % of Tm3+. Finally, the RL spectrum shown the emission peaks at 455 and 360 nm, which can be attributed to the 1D2?3F4 and 1D2?3H6 transitions of the Tm3+ ions.