Effect to optical properties by changing the Al2O3 ratio in K2O-Al2O3-P2O5 glasses

In this study, we prepared glasses with the composition of 0.1% Ce-doped (100-x) KPO3-xAl(2)O(3) and investigated luminescent characteristics. The glass samples with different Al2O3 ratio (x = 5, 10, 15, 20, 25, 30 and 40) were synthesized by the melt quenching method. The All samples had high transmittance (80-90%) at wavelengths longer than 350 nm except for x = 40, and by increasing the Al2O3 ratio, the transmittance of the samples was improved. From the measurements of photoluminescence (PL) decay curve, the luminescence decay time was confirmed to be typical for the 5d-4f transition of Ce3+ (similar to 30 ns). The samples showed thermally-stimulated luminescence (TSL), and the sensitivity of dose response was confirmed to be linear in the dose range from 0.01 mGy to 1 Gy for the x = 25 and 30 samples which showed the highest sensitivity among the present samples. The scintillation spectra show the broad luminescence around 300-500 nm, and these emission intensities were increased by increasing the Al2O3 ratio.