Investigation of nano phosphor of SrSO₄ activated by Sm and Tb as a potential UV detector

In this research, nanocrystalline powder of SrSO₄: Sm was prepared by chemical co-precipitation method at room temperature. The SrSO₄: Sm nanocrystalline powder was characterized using X-ray diffraction and energy-dispersive x-ray spectroscopy , thermoluminescence and photoluminescence. Under UV irradiation, all samples had a main peak at 220℃C. The advantage of this acetylcresotinic powder is a simple thermoluminescence glow peak in the temperature above 200℃for UV radiation dosimetric. The results showed that changing Sm concentration affected the thermoluminescence glow curve intensity and the maximum intensity of the thermoluminescence glow curve of SrSO₄: Sm was obtained for Sm with 0.15 moL%. The thermoluminescence response of the SrSO₄: Sm irradiated with different UV irradiation time showed a linear behavior from 10-90 minutes. The fading of this nanocrystalline powder was less than 16% for 4 weeks.Moreover, the emission spectra of the SrSO₄: Sm nanocrystalline powder under excitation wavelength 320 nm showed peaks in the 690 and 725 nm wavelengths which were related to ⁴G_5/2-⁶H_11/2 and ⁴G_5/2-⁶H_13/2, respectively.