| Abstract: |
Long lasting phosphor is a kind of energy-storing material. The material can absorb the visible lights, store the energy, and then release the energy as visible light which leads to a long lasting afterglow in the darkness. Strontium aluminates activated by Eu new long lasting photoluminescence materials. These materials have recently attracted more attention due to not only their bright luminescence and super long afterglow without radioactivity but also the extensive app lication. Atmosphere plasma spraying (APS) is a commonly used method for preparing coatings.
SrAl2O4:Eu, Dy coatings were prepared by low power plasma thermal spraying (2.5-4W). The effects of the powder characteristics and the plasma conditions on the porosity rate of the coatings were investigated by many techniques, respectively X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical microscope. To better qualify the characteristics of these coatings prepared from spray-dried powders, luminescence characteristics were also studied. The optimum spraying conditions have been established by analyzing the relation of luminescence characteristics with spray parameters.
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