We report on the ultraviolet photoluminescence (UV-PL) and Raman properties of wurtzite nanopowders of average size that were synthesized via the thermal decomposition method. For the studied composition range of , the room-temperature UV-PL was found to be tuned by towards the UV spectral range, and the PL emission was established to be due to an excitonic-type recombination mechanism. The first-order longitudinal optical (LO) Raman mode was found to exhibit a blueshift of and the second-order LO a shift of . The LO mode of the nanopowders is discussed in terms of a mixed symmetry phonon known as a quasi-LO mode. The observed blueshift indicates that the is the principal symmetry component in the Raman scattering of the nanopowders.
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