Luminescence properties of La_2O_3:Eu~(3+) nanophosphor prepared by sol-gel method

摘要

Undoped and Eu~(3+) doped La_2O_3 nanophosphor are synthesized by low temperature sol-gel technique. The synthesized samples are characterized by X-ray diffraction (XRD) and average crystallite size is found to be ～18 nm and ～23 nm for undoped and Eu~(3+) doped La_2O_3 respectively. Gamma ray irradiated undoped La_2O_3 shows high intense thermoluminescence (TL) glow peak at 640 K and weak TL glow peak at 443 K and the high intense peak intensity is sub linear increase with γ-dose. Whereas Eu~(3+) doped La_2O_3 nanophosphor show a prominent TL glow peak at 640 K and its TL intensity linearly increases up to 1 kGy. The kinetic parameters are estimated using glow curve deconvoluted (GCD) technique. TL emission of γ-ray irradiated Eu~(3+) doped La_2O_3 show peaks at 508, 586, 619 and 706 nm are attributed to Eu~(3+) transition peaks.