Sol-gel Preparation Of Pvb Coated Zinc Oxide And Of Zn The <sub> 1-x </ Sub> Of Mg <sub> X </ Sub> O Alloy Thin Film Optical Properties,

Zinc oxide (ZnO) is a wide band gap (3.37 eV) semiconductor oxide and has a large exciton binding energy (60 meV), which allows its high efficient ultraviolet (UV) emission from the exciton and wide application to short-wavelength laser diodes and UV detectors.Until now, ZnO has been grown with various methods such as pulsed laser deposition (PLD), radio frequency magnetron sputtering (RFM) and metalorganic vaporphase deposition (MOCVD). Here, ZnO nanoparticles capped with polyvinyl butyral (PVB) and Zn1-xMgxO thin films (0.56≤x≤0.91) were fabricated by the sol-gel process. Comparing with other methods, sol-gel technique is known to have many distinct merits such as process simplicity and high homogeneity, which offers the possibility of large-area yield at low cost and low temperature synthesis for technological application.In order to improve the optical quality, ZnO nanoparticles capped with PVB were fabricated by the sol-gel process and the particles were obtained both in powder form and in coating film form. The influence of PVB on the optical properties of ZnO nanoparticles is investigated. When the ZnO nanoparticles are capped with PVB, PVB molecules do not only improve the surface of ZnO nanoparticles by compensating dangling bonds and unsaturated bonds, but also spatially block the process of surface-trapped hole tunneling back into the particles to form VO** recombination center. The PL spectra of powders and coating films suggest that the surface passivation via PVB capping is an effective method to improve the optical characters of ZnO nanoparticles.On the other hand, in order to achieve shorter wavelength emission at room temperature in an economical and versatile way, Zn1-xMgxO thin films with high Mg2+ concentration were fabricated by the sol-gel method. A systematic investigation of Zn1-xMgxO thin films (0.56≤x≤0.91) was conducted and optical properties were investigated. Moreover, the influence of annealing temperature on grain size and photoluminescence were also explored.