Abstract
Structural and optical properties of AWO4(A=Ba, Sr, Ca, Mg, and Zn) ceramics were investigated. The structural analysis confirmed the scheelite-type tetragonal structure for (A=Ba, Sr and Ca)WO4 and wolframite-type monoclinic structure for (A=Zn and Mg)WO4 compounds. The experimentally observed optical band gap (Eg) found to be in the range of 4.17–5.92 eV agree with those calculated with the help of density functional theory. A decrease in band gap value with the decrease in ionic radii of A2+ in the AWO4 compound was observed. An intense blue-green photoluminescence emission was observed for these materials and correlated with Eg. The environmental factor he calculated by complex chemical bond theory has been correlated with the broadening of PL excitation bands. The excitation spectra revealed that there subsists a negative relation between he and position of energy levels.
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