Abstract
BaAl2O4:Eu2+ and ZnAl2O4:Eu3+ phosphors were prepared by urea combustion route. The formation of crystalline aluminates was confirmed by X-ray diffraction. The X-band EPR spectra of BaAl2O4:Eu2+ showed the presence of Eu2+ ions, while in the case of ZnAl2O4:Eu3+, no signal attributable to Eu2+ was observed. The broad band UV excited luminescence of BaAl2O4:Eu2+ was observed at the blue region (λmax=439nm) due to transitions from the 4f65d1 to the 4f7 configuration of the Eu2+ ion, whereas ZnAl2O4:Eu3+ gave an emission at 613nm attributed to 5D0–7F2 transition of Eu3+ ions.
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