Abstract
We report the modifications in the structural and optical characteristics of Pr doped ZnS/TiO2 nanocrystals under 120 MeV Au9+ ions irradiation at various fluence ranges. The structural modification of Pr doped ZnS/TiO2 under swift heavy ion irradiation (SHI) shows texturing of ZnS crystalline planes as revealed by x-ray diffraction (XRD) pattern. Scanning electron microscopy (SEM) analysis shows cubical microstructures of pristine Pr3+ doped ZnS/TiO2 which are grown by aggregated nanoparticles. The morphological modifications under SHI show the growth of nano whiskers at highest fluence 3 × 1013 ions cm−2 with simultaneous disintegration of the initial cubical morphology. Photoluminescence (PL) spectrum reveals the white emission with luminescence peak at 485 nm, 525 nm and 665 nm for corresponding transition energy levels 3P0- 3H4, 3P0- 3H5 and 3P0- 3F2 of Pr3+ ions in ZnS host matrix. Also, it shows the characteristic blue emission due to sulphur vacancies at 379 nm in ZnS. At higher irradiation fluence 3 × 1013 ions cm−2, decreased PL intensity shows production of high dislocation density or non-radiative recombination of carriers in nanocrystalline Pr3+ doped ZnS/TiO2 structure.
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