Luminescence of Ce-doped aluminophosphate glasses
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The effects of BaO network modifier on the structure, optical properties and luminescence of Ce-doped aluminophosphate glasses were investigated. Glasses were prepared by the melt quenching method in air with different chemical compositions: 50 or 60 mol% P2O5 + 5, 15 or 25 mol% SiO2 + 4–19 mol% BaO + 15 mol% Al2O3 + 1–6 mol% Ce2O3 such the total summed up to 100 mol%. Density was determined to be within 2.7–3.0 g/cm3, while the index of refraction was estimated using the Gladstone-Dale relation using the experimentally-obtained density values to be around 1.48. For each glass series, Raman spectra varied according to the BaO and/or Ce2O3 content. For 1 mol% Ce-doped glasses, the ultraviolet (UV) transparency cutoff was within 317–328 nm, with the cutoff wavelength increasing to 367–373 nm for 6 mol% doped glasses. Scintillation was characterized by radioluminescence (RL) measurements under X-ray excitation, and luminescence by photoluminescence emission (PL), excitation, and fluorescence lifetime measurements. PL and RL results showed a broad band centered around 3.3–3.6 eV with a fluorescence lifetime of about 30 ns. The highest RL output was observed from the 60P2O5·14BaO·5SiO2·15Al2O3·6Ce2O3 glass.
This material is based upon work supported by the National Science Foundation under Grants Nos. 1653016 and 1746230.
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