Abstract
Gd2(1−x)O3: 2xEu3+ nanophosphors have been successfully synthesized by low temperature sol–gel method using tartaric acid as a chelating agent. The crystallinity, morphology, particle size and optical properties were studied by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscope, Fourier-transform infrared spectroscopy and photoluminescence techniques. XRD profiles indicate that Eu3+ doped Gd2O3 nanoparticles possess highly crystalline cubic structure. Homogenous spherically shaped particles in the nanometer range having no effect of different concentrations of tartaric acid were evidenced by morphological analysis. Optical properties along with chromaticity coordinates of the Gd2(1−x)O3: 2xEu3+ nanophosphors, exhibiting an intense red emission corresponding to 5D0 → 7F2 transition of Eu3+ ions at 612 nm under 254 nm excitation were investigated. Optical studies reveal that emission intensity strongly depends on the sintering temperature, Eu3+ ions concentration as well as molar ratio of dopant ions to chelating agent i.e. tartaric acid. Hence, Eu3+ doped Gd2O3 nanoparticles having color coordinates approaching towards red region with the increasing Eu3+ ions contents seems to be a promising candidate for efficient opto-electronics applications.
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