| In this paper, a novel method for synthesis of ZnO colloidal spheres is presented. In addition, we have proposed a tunable PC, in which the PBG can be tuned as desired by controlling parameters such as ZnO colloidal spheres size and temperature. The transmission spectra and reflectance spectra of the PC shift systematically with the spheres size, providing evidence of photonic crystal effects. Photoluminescence measurements show efficient emission of the ZnO photonic crystals in the UV as well as a defect emission band at longer wavelength. |
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