Publications (2)3.07 Total impact
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Article: Preparation, characterization, and optical properties of nano- and submicron-sized Y2O3:Eu3+ phosphors
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ABSTRACT: Ultrafine Y <sub>2</sub> O <sub>3</sub>: Eu <sup>3+</sup> phosphors were prepared by a modified solution combustion method. The as-prepared samples with sizes of 17.6–80 nm (nanophosphors) and 300 nm (submicron phosphors) were characterized by x-ray diffraction, transmission electron microscope, scanning electron microscopy, selected area electron diffraction, and energy dispersive x-ray spectroscopy. The emission spectra of the samples are unchanged in comparison with that of standard material. The excitation spectra show a redshift in the charge-transfer-state band and a blueshift in the host gap band. In relation to commercial sample, the relative luminescence intensities of nano- and submicron phosphors are increased sufficiently to 64.4% and 93.6%, respectively. Higher quenching concentration of the activator Eu <sup>3+</sup> ion was observed in the nanophosphor than that in the phosphor synthesized by solid state reaction.Journal of Applied Physics 04/2009; · 2.17 Impact Factor -
Article: A modified solution combustion method to superfine Gd2O3:Eu3+ phosphor: preparation, phase transformation and optical properties
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ABSTRACT: Cubic and monoclinic Gd2O3:Eu3+ phosphors in the range of nano-scale and submicron-scale were prepared by a modified solution combustion method. Coexistence of cubic and monoclinic phases was found in the highest luminescent sample synthesized at 600 °C. In relation to commercial sample, the relative luminescence intensity was 49.8%. The shape of emission spectrum of the sample thus changed and the charge-transfer-state band of excitation spectrum slightly shift toward higher energies. With increasing the annealing temperature, phase transformation and correlative optical properties of Gd2O3:Eu3+ phosphors were studied. It was found that the samples were dominated by cubic structure and monoclinic structure at temperatures below and above 900 °C.Journal of Rare Earths 28(3):345-350. · 0.90 Impact Factor
