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Title: Structure and luminescence of core-shell phosphor aluminate-boron oxide
Authors: Chen-Yu Wu
Chien-Ming Lei
Toshiaki Takei
Rudder Wu
Shing-Hoa Wang
Chau-Chang Chou
Horng-Yi Chang
Contributors: 國立臺灣海洋大學:輪機工程學系
Keywords: Luminescence
Date: 2018-04
Issue Date: 2018-08-28T08:10:56Z
Publisher: Journal of Alloys and Compounds
Abstract: Abstract: Long-afterglow phosphor SrAl2O4: 0.01Eu2+, 0.01Dy3+ (SAO) requires a high sintering temperature of 1400 °C even when boric acid is added as flux via a solid-state reaction. The aluminum source NaAlO2 behaved as a good mineralizer in the designed hydrothermal process to achieve a large surface-to-thickness ratio of SAO. The flower-like shape of hydrothermally prepared hSAO without B2O3 after annealing at 1100 °C/4 h transformed into a rod-like plate phosphor with nano-thickness. Such a small rod-like plate exhibited higher photoluminescence (PL) intensity than large-grained B2O3-added bSAO prepared via a solid-state reaction. The annealed hSAOs inherited the morphology of the as-hydrothermally prepared aluminates. A nano-thick sheet of annealed aSAO containing B2O3 further enhanced the PL significantly and indicated a blue shift independent of the grain size. Furthermore, the nano-thick sheet of phosphors exhibited the same afterglow as the conventional tens-of-micrometers-sized phosphors. Fourier-transform infrared spectroscopy and X-ray diffraction results showed that the BO4 bond may substitute AlO4 in the structure and the BO3 bond is in a flux outside the annealed aSAO and bSAO grains. The molten flux formed a thin layer on the surface of the SAO particles to be a core-shell of the SAO-B2O3 structure, behaving as a diffusion-assistant medium and environmental protection layer against acid and humidity.
Relation: 743 pp.506-513
Appears in Collections:[Department of Marine Engineering] Periodical Articles

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