Abstract
A series of CdWO4 doped with different concentrations of Sm3+ have been successfully prepared by the combination of co-precipitation method with annealing of the precipitate formed. The prepared samples were characterized by XRD, TEM, FT-IR, SAED, EDS and PL. XRD studies exhibited monoclinic wolframite structure of the prepared samples and the crystallinity was increased with the increase of annealing temperature upto 900°C without any structural changes. FT-IR studies indicated vibrational bands of metal cations bonds like Cd-O, W-O and Cd-O-W for the CdWO4:Sm3+ phosphors in the ranges from 400 to 900cm−1. Photoluminescence studies showed characteristic emission lines of Sm3+ centers at 569, 608, 653 and 715nm upon 279nm UV light excitation. The observed most intense peak at 653nm is due to the 4G5/2-6H9/2 transition. The optimum concentration of Sm3+ was found at 1 at.%. The photoluminescence intensity was increased with the increase of annealing temperature.
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