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In an effort to shed light on the widely discussed issue of defects and photoluminescence (PL) from ZnO material, we have undertaken this in-depth study using low temperature PL and room temperature Raman spectroscopy. Initial defective states of polycrystalline ZnO have been varied by annealing at 500 and 800°C. Further, point defects have been incorporated in the systems by 700keV oxygen ions. 10K...
A systematic study on the modification of optical properties in mechanically milled ZnO powder has been reported here. The average grain size of the powder becomes ∼20nm within 4h of milling. Fluctuations of average grain size have been noticed at the initial stage of milling (within 15min). Changes in grain morphology with milling have also been noticed in scanning electron micrographs of the samples...
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