| Synthesis and Characterization of SrAl2O4:Eu2+, Dy3+ Nanocrystalline Phosphorescent Pigments |
| E. Shafia, A. Aghaei, A. Davarpanah**, M. Bodaghi*, M. Tahriri*** and S. H. Alavi**** |
| Abstract |
| In this research, the Eu2+ and Dy3+ co-doped strontium aluminate (SrAl2O4) nanocrystalline phosphorescent pigments with high brightness and long afterglow was successfully synthesized by urea-nitrate solution combustion method (SCS) at 600oC, followed by heating the resultant combustion ash at 1200oC in an atmosphere which was weak reducing (5%H2 + 95%N2). The pure SrAl2O4 monoclinic phase as host structure could be formed by combustion method in which the temperature is very much lower than solid-state method. A broad-band UV-excited luminescence of the SrAl2O4:Eu2+, Dy3+ phosphorescent pigments was observed at max = 517 nm due to transitions from 4f65d1 to 4f7 configuration of the emission center (Eu2+ ions). The excitation spectra showed two main peaks at 240 and 256 nm. Eventually, the average grain size of the combustion ash powder and SrAl2O4:Eu2+, Dy3+ phosphor particles were obtained as 40 and 62 nm, respectively via Scherrer’s formula and these particles were in thin flake form. |
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