Abstract
We report photoluminescence observed from ZnO nano particles/clusters formed in gaseous phase of two colliding plumes ZnO plasma using fourth harmonic 266 nm of Nd:YAG laser. The two expanding plumes generated using 1.06 μm of Nd:YAG laser interact with each other, resulting in an overlap region where the collision front in lateral direction of two plumes forms an overlapping region starting at ∼20 ns lasting ∼5 μs with respect to ablating pulse. The blue shift in peak position (∼30–5 meV) of photoluminescence profile of ZnO clusters to that observed in bulk ZnO shows the effect of quantum confinement. The dynamical growth of nanoparticles is ascertained using Rayleigh scattered second harmonic radiation at 532 nm of Nd:YAG laser. A combined photoluminescence and light scattering at longer time delays ∼1.5 ms where plasma emission is absent confirms the formation of the nano-particles/clusters of ZnO. Observed intensity variation in the Rayleigh scattered signal and blue shift in photoluminescence peak position at different temporal delays with respect to the ablation pulse corroborates the presence and size variation of nano-particles/clusters. The defect related emission band arising due to oxygen vacancy is not observed from the ZnO clusters.
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