The effects of pure ZnO and copper (Cu) dopant on the properties of ZnO thin films grown by chemical bath deposition (CBD) and dip coating method on glass substrates are investigated. For more comparison purpose, powder samples of pure ZnO and Cu-doped ZnO prepared at room temperature. Optical properties are investigated through UV-vis-NIR transmission spectroscopy. Raman spectroscopy from ZnO films has been investigated. Photoluminescence spectra of the samples shows prominent peaks corresponding to blue emission and defect-related green emission in the visible region at room temperature and their possible mechanism have also been discussed.