Abstract
Gd2O2S:Pr,Ce nanophosphors have been prepared by liquid-phase method using NH2SO3H as the sulfur source for the first time. The formula of the novel precursor was determined as Gd2(OH)x(NH2SO3)6-x∙nH2O by EDS, TG-DSC and FT-IR spectroscopy, and the precursor exhibited an amorphous structure and lamellar morphology as deduced from XRD and SEM. The optimum pH was 8 and the optimum calcination temperature was 1000 °C for the preparation of Gd2O2S:Pr,Ce from the precursor. The PL quantum yield and the fluorescence lifetime of Gd2O2S:Pr,Ce powder was 53.62 % and 2.48 μs respectively, which will allow the preparation of ceramic scintillators with high optical output and energy resolution. Compared to the traditional sulfur sources such as sublimed sulfur, and H2SO4, NH2SO3H is harmless and avoids pollution gases during the preparation of Gd2O2S:Pr,Ce nanophosphors. It also eliminates the need to add additional reagents, simplifying the preparation steps and reducing production costs.
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