simple and economic coating monitoring technology. The light-emitting properties of the novel coating can serve as an indicator layer, which warns when the coating has worn off, replacing or recoating is necessary [7]. When we inspect on coating with a hand-held UV-lamp, the yellowgreen light of SrAl2O4:Eu, Dy3+ will disappear. It means that the functional coating is worn out and that recoating...

Sr(NO3)2, Al(NO3)3, NH2CONH2, Eu2O3 and Dy2O3 are used as the raw materials for the preparation of SrAl2O4 (RE: Eu, Dy) precursor by the combustion synthesis technique (CST), which is widely known to prepare nano sized phosphors. The influence of varied concentration of Dy on crystal structure and optical properties is analyzed by means of Xray diffraction (XRD), scanning electron microscopy (S...

In 1996, Matsuzawa et al. reported on the enormously long-lasting afterglow of SrAl2O4: Eu 2+ co-doped with Dy ions, which was more than 10-times brighter than the previously widely used ZnS: Cu. Since then, research for stable and efficient phosphors has constantly gained attractiveness. However, even today almost 15 years after the invention of SrAl2O4: Eu 2+ the number of luminescent materia...

In 1996, Matsuzawa et al. reported on the extremely long-lasting afterglow of SrAl2O4:Eu 2+ codoped with Dy 3+ ions, which was more than 10-times brighter than the previously widely used ZnS:Cu,Co. Since then, research for stable and efficient persistent phosphors has continuously gained popularity. However, even today almost 15 years after the discovery of SrAl2O4:Eu 2+ , Dy 3+ the number of p...

Recent improvements to SrAl2O4:Eu2+, Dy3+ phosphors have enabled the use of luminescent hosts with a stable crystal structure and high physical and chemical stability, thus overcoming the bottleneck in the applicability of ZnS:Cu phosphors. However, enhancement of afterglow lifetime and brightness in SrAl2O4:Eu2+, Dy3+ phosphors remains a challenging task. Here, we have improved the afterglow c...

The SrAl2O4: Eu 2þ, Dy3þ phosphor powders were prepared by a new sol–gel method using aluminum isopropoxide and strontium acetate as precursors. The sol–gel process and the structure of the phosphor powders were investigated by means of DSC-TG and XRD. It was found that the single-phase SrAl2O4 was formed at 900 8C, which is 300 8C lower than that required for the conventional solid-state react...

In this paper, preparation of SrAl2O4:Eu,Dy luminescent pigment has been investigated. Coprecipitation as a low cost and facile method was selected. X-ray diffraction patterns indicated the formation of SrAl2O4:Eu,Dy phase through calcinations process above 800 °C. Moreover, a few amount of silica caused the structural transformation to alumina silicate phase. Transparent glaze which consist of...

Certain nanoparticles exhibit intense light emission during their elastic deformation, called the phenomenon of elastico mechanoluminescence (EML).When ZnS:Mn and SrAl2O4:Eu nanoparticles are deformed in the elastic region by the stress initially increasing with time and then attaining a fixed value or by the stress initially increasing and then decreasing with time or by the impact stress, the...

Strontium aluminate, SrAl2O4 is well-known phosphor host material with spinel structure. Mg substituted compositions, MgxSr1-xAl2O4: Eu, Nd (with x= 0.05 0.25) were prepared by solid-state reaction method. Effect of Mg substitution on structure and photoluminescence was investigated. Prepared compositions were characterized for the phase and crystallinity by powder X-ray diffraction. The micro-...

The modification effect of the doping of Yb ions, as an auxiliary activator, onto the luminescent properties of SrAl2O4:Eu , Dy phosphor was studied for the first time. The phosphorescent nanoparticles were prepared by the combustion method. The experimental results indicate that the appropriate doping of Yb ions largely improves phosphorescence of the phosphors with more intense luminescence, ...