Abstract
Nanostructures of V2O5, doped with Dy3+ ions of different concentrations were prepared though solution combustion technique using Cymbopogon citratus extract as a fuel for its application towards white light LEDs (WLEDs). The characterization tools such as PXRD, FTIR, Raman spectroscopy, DRS, SEM, TEM, EDS and SAED was employed to study the structural and morphological features of the V2O5: Dy3+ nanostructures. Positron annihilation lifetime spectroscopy (PALS) is a non-destructive technique carried out to find out the type of defects evolved during Dy3+ ion doping into the host matrix, which has greater influence on the photoluminescence properties of the V2O5 nanostructures. The positron lifetime annihilation spectrum was analyzed with τ1, τ2 the lifetime components, τ1 is the shortest and attributes to the free positrons. τ2 was found to be longer and arises due to trapped positrons at the grains, grain boundaries and their interface. As the Dy3+ ion concentration increases positron annihilation lifetime increases due to development of strain gradient in host matrix.
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