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A simple chemical method has been used to synthesize pure and crystalline ZnO nanoparticles. XRD study revealed hexagonal unit-cell with crystallite size 18.32 nm. Non-Debye type relaxation mechanism leads to an additional constant-phase-contribution to the equivalent parallel RC-network. The grain-boundary effect to the conductivity is very large. The dc conductivity was calculated to be 4.9×10-8 (Ω-cm)-1. The high loss-tangent at lower frequency is contributed by the large grain boundary effect of the material. The material is highly transparent in the visible window of wavelength with wide and direct band gap of 3.53 eV. The highly intense photoluminescence at 583 nm is attributed to oxygen related defect (interstitials or vacancy) .

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