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This paper reports the structural, photometric, spectral and trapping parameters of Eu 3þ -doped gadolinium oxysulphide nanophosphor. The X-ray diffraction (XRD) data show the presence of the hexagonal phase of Gd 2 O 2 S and a crystallite size in nanometre range. Different structural parameters were calculated from XRD data. The Fourier transform infrared (FTIR) spectrum also confirms the formation of a compound. Scanning electron microscope studies reveal the morphology and crystallite size of the prepared phosphor. The band gap of the phosphor was calculated from diffuse reflectance spectra using the Kubelka-Munk function at 4.76 eV. The phosphor was illuminated with ultraviolet light and shows the characteristic red luminescence corresponding toThe Judd-Ofelt intensity parameters and spectral parameters were estimated from the photoluminescence data. The nanophosphor was irradiated with g-rays in the dose range 15-50 Gy for thermoluminescence (TL) studies and a shifting of the peak towards lower temperatures was observed with increasing g-dose. Trapping parameters were calculated from TL data using various glow curve analysis methods.

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