Abstract
The europium and neodymium oxides doped nano-structured calcium aluminate phosphor samples have prepared through combustion technique and their luminescence properties are studied using laser excitations. Samples prepared in open atmosphere showed the presence of both Eu3+ and Eu2+ states and their ratio changes with calcination temperature. Single Eu3+/Eu2+ ions doped sample has found to give broad emission at 450nm without the persistence glow while the Eu3++Nd3+ ions codoped sample has shown persistence glow at 450nm (Eu2+) on 355nm laser excitation. Wavelength selective excitations show that 266nm excitation gives the intense emissions from both Eu3+ and Eu2+ states with no afterglow but 355nm excitation gives negligible emission from Eu3+ ions and a strong afterglow at 450nm wavelength. The mechanism of wavelength dependent phosphorescence has been discussed. Studies on Stark splittings and their relative intensities in emission spectra of Eu3+ ions have shown that Eu3+ ion can be used as excellent probe of crystal structure.
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