Combustion Synthesis of SrAl2O4:Eu2+ Phosphor. Photoluminescence and Cathodoluminescence at Low Temperatures

Eu2+ doped strontium aluminate (SrAl2O4:Eu2+) nanosized phosphorescent powders were prepared by the urea-nitrate solution combustion method at 500 degrees C for 5 min. The average particle size of the powders was about 80 nm. The photoluminescent properties were studied using ultraviolet excitation as well as high energy synchrotron radiation, and electron beam excitation. Broad photoluminescence bands were observed in SrAl2O4:Eu2+ peaking at lambda(max) = 450 and 520 nm which arise due to transitions from the 4f(6)5d(1) to 4f(7) configuration of the Eu2+ ions situated in two sites with a different symmetry. One additional emission band was also observed at 360 nm. The nature of that band is under discussion.