Mechanoluminescence Characterization of Gamma Irradiated TB Doped Mg(VO3)2 Phosphors

Rare earth doped materials attracted much attention of the researcher due to characteristics emission in the visible region. In present investigation the ML intensity of ?-irradiated Tb doped divalent metal metavanadate phosphors have been studied. It has been found that single peak is observed in Tb doped Mg(VO3)2 phosphors relative to the ML intensity versus time curve. It is also observed that ML intensity increases with mass of the piston dropped on to the samples without any considerable change in peak positions, for all the samples. We have also observed that, the total ML intensity increases with impact velocity.The ML intensity is found optimum for the sample having 0.05 mol% concentration of Tb. ML intensity is found optimum for a particular concentration(0.05 mol%) of Tb then decrease with further increase in dopant concentration. ML intensity also increases with ?-dose given to the samples and seems to saturate for higher ?-doses. ML spectra of Tb doped divalent metal metavanadate phosphors show the characteristic emission of rare earth impurities. In Tb doped metavanadate phosphors a single peak at 482 nm was due to 5D4-7F6characteristics emissionof Tb3+ ions.The prepared samples are characterized by x-ray diffraction XRD, scanning electron microscopy SEM and photoluminescence PL.