PL and TSL properties of tin-doped zinc sodium phosphate glasses

Photoluminescence (PL) and thermally-stimulated luminescence (TSL) properties of Sn-doped zinc sodium phosphate glasses were evaluated. We synthesized the glass samples by the conventional melt-quenching method under ambient atmosphere. The glasses were highly transparent in 400-2700 nm. Depending on the concentration of Sn, PL quantum yield (QY) ranged from 7.7 to 25.7%, and the PLQY increased with increasing the concentration of Sn. The Sn-doped samples showed PL with a broad feature due to the 5sp→5s2 transition of Sn2+. The PL decay constants were 4.72-4.83 μs, and any dependence on the concentration of Sn was not observed. The glasses showed intense TSL, and the glow curves had a broad feature peaking at 110 °C. Among the present samples, the 0.5% Sn-doped sample exhibited the highest sensitivity with a good linearity over 5 orders of magnitude (0.1-10000 mGy). In addition, the TSL fading characteristics were evaluated, and the integrated TSL intensities after two days were 5.5% (undoped), 41% (Sn:0.1%), 38% (Sn:0.2%), 40% (Sn:0.5%) and 35% (Sn:1.0%), respectively.