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ZnO nanoparticles were prepared using a simple evaporation technique at pressures of 75 and 760 torr. A wide visible emission was recorded from both samples using photoluminescence spectroscopy. The presence of green emission at 530 nm is due to deep level defects of vacant zinc VZn, and/or their complexes in the ZnO band gap. The fundamental optical phonon modes were identified in addition to multiphonon...
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