Synthesis and optical activity of KI-added ZnO microrods grown via hydrothermal method
The effect of potassium iodide (KI) addition on the morphological, structural, and optical properties of zinc oxide (ZnO) was investigated. Modifications on the morphology of ZnO was observed as rods started to deteriorate as the concentration of KI was increased. No impurity peaks and phase shifts that correspond to a change in the crystal structure of ZnO was observed. The photoluminescence spectra of ZnO showed a UV and visible emission. For samples with KI, an intense visible emission, compared with that of the as-prepared ZnO, was observed which can be attributed to the introduction of defect states and impurities in the ZnO lattice. Thus, studying the effect of KI on the properties of ZnO, especially on the optical part, can help us understand specific defect emissions for us to broaden our knowledge in tuning the optical emissions of ZnO, which is still a controversial topic to discuss with.