Employing a simple chemical synthesis method, hexagonal shaped zinc oxide microrods with lattice parameters: a = 3.2498 and c = 5.2066 Å were deposited on pyrex glass and aluminum substrates. PL results revealed best optical quality for ZnO on pyrex glass. Their principal optical and physical characteristics were: a) very uniform wide and large sizes of around 1 and 10 µm, respectively, b) preferred crystalline growth in [1010] and [0001] directions, c) strong exciton photoluminescent emission centered at 390 nm with a FWHM of 70 meV at room temperature, d) an energy band gap of 3.32 eV, e) almost null photoluminescent emission in the visible region of the electromagnetic spectrum due to poor existence of structural defects, f) good emission efficiency supported by the not required high energy densities to obtain strong exciton emission and g) good ZnO stoichiometry endorsed by photoluminescent and chemical composition results. ZnO microstructures obtained in this work are evidence that the grow mechanism of microrods strongly depends on the substrate employed. Pyrex glass substrate resulted better than aluminum for deposition of microrods, enhancing its optical properties. They presented good optical quality to future applications in photonics.

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