Incommensurately Modulated Structures and Luminescence Properties of the AgxSm(2-x)/3WO4 (x = 0.286, 0.2) Scheelites as Thermographic Phosphorsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 сентября 2018 г.
Аннотация:Ag+ for Sm3+ substitution in the scheelite-type AgxSm(2-x)/3WO4 tungstates has been investigated for its influence on the cation-vacancy ordering and luminescence properties. The x = 0.286, 0.2 scheelite-type phases were synthesized using a solid state method. Transmission electron microscopy revealed the (3+1)D incommensurately modulated structures, which were refined from high resolution synchrotron powder X-ray diffraction data. Under near-ultraviolet (n-UV) light, the AgxSm(2-x)/3WO4 (x = 0.286, 0.2) phosphors show the characteristic emission lines in the range of 550–720 nm, corresponding to 4G5/2→6HJ (J = 5/2, 7/2, 9/2 and 11/2) transitions of Sm3+ ions, with the J = 9/2 transition at the ~648 nm region being dominant for all PL spectra. Different temperature dependencies were found for the intensity of the 4G5/2 → 6H9/2 and 4G5/2 → 6H7/2 bands. The emission intensity ratios (R) for these bands vary reproducibly with temperature, allowing the use of these materials as thermographic phosphors.