Abstract
Calcium aluminate, CaAl 2O 4:Eu 2+ and its Zn 2+ substituted variants with high brightness and long persistent luminescence were prepared by solid-state reaction method. The phosphor compositions with varying Zn 2+ were investigated by powder X-ray diffractometer (XRD), SEM, TEM and photoluminescence excitation and emission. Broad band UV excited luminescence of the CaAl 2O 4:Eu 2+ was observed in the blue region ( λ max = 440 nm) due to transitions from the 4f 65d 1 to the 4f 7 configuration of the Eu 2+ ion. The effect of Zn 2+ concentration on the photoluminescence properties of these compositions was investigated. The decay time of the persistence indicated that the persistent luminescence phosphor has bright phosphorescence and maintains a long duration.
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