RISS 검색 - 국내학술지논문 상세보기

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다국어 초록 (Multilingual Abstract)

Eu3+- or Sm3+-doped La₂MoO6 phosphors were synthesized with different concentrations of activator ions via a solid-state reaction. The X-ray diffraction patterns exhibited that crystalline structures of all the phosphors were tetragonal systems with the dominant peak occurring at (103) plane, irrespective of the concentration and the type of activator ions. The crystallites showed the pebble-like crystalline shapes and the average crystallite size increased with a tendency to agglomerate as the concentration of Eu3+ ions increased. The excitation spectra of Eu3+-doped La₂MoO6 phosphors contained an intense charge transfer band centered at 331 nm in the range of 250-370 nm and three weak peaks at 381, 394, and 415 nm, respectively, due to the 7F0→5L7, SUP>7F0→5L6, and 7F0→5D₃ transitions of Eu3+ ions. The emission spectra under excitation at 331 nm exhibited a strong red band centered at 620 nm and two weak bands at 593 and 704 nm. As the concentration of Eu3+ increased from 1 to 20 mol%, the intensities of all the emission bands gradually increased. For the Sm3+-doped La₂MoO6 phosphors, the emission spectra consisted of an intense emission band at 607 nm arising from the ⁴G5/2→6H7/2 transition and three relatively small bands at 565, 648, and 707 nm originating from the ⁴G5/2→6H5/2, ⁴G5/2→6H9/2, and ⁴G5/2→6H11/2 transitions of Sm3+, respectively. The intensities of all the emission bands approached maxima when concentration of Sm3+ ions was 5 mol%. These results indicate that the optimum concentrations for highly-luminescent red and orange emission are 20 mol% of Eu3+ and 5 mol% of Sm3+ ions, respectively.

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