The Preparation And Optical Properties Of ZnO And ZnO:Al

ZnO is considered to be the direct wide-gap（3.37eV） semiconductor with a highexciton energy of excition60meV. Based on those properties, ZnO have been attractingmore and more attention in those years. It is expected to replace GaN as a newsemiconductor photoelectric material. Its large exciton energy leads to exciton stimulatedat room temperature. Hence ZnO is kind of the best material of UV light-emitting deviceand laser semiconductor laser. In addition, ZnO is suitable for industrial productionbecause of its stability, radioresistance and mature processing technique.It is necessary to investigate the optical properties of ZnO in order to improve theperformances of ZnO-based devices and further explore its applications. In this paper, alist of ZnO films has been prepared by Sol-Gel on the glass substrate. The work studymainly on the transmission and emission phenomenon including the effect of dissolventand chelator, temperature and thickness. XRD,SEM，PL，TL techniques have been used toinvestigate the properties. The main work is listed as follow:The effect of dissolvent and chelator. The results are that plan B deserve the betterquality and plan A deserve the better luminescent property.The films have been prepared by Sol-Gel under different annealing temperature. Weinvestigated the annealing temperature effect on the quality and optical properties. Wefound three photoluminescence peaks in our samples. We analyzed the emissionmechanism of the three peaks and the shift of the peaks.We researched the thickness effects. The results is that more thick better qualityworse optical properties.In order to improve the photoluminescence properties，we doped Al in ZnO. Wefound appropriate amount Al doped improved the quality and the optical properties of thefilms. The improvements show in the better transmission and blue shift of the optical bandgap. It also showed in the better photoluminescence. Beside, a little connection between the little step in TL and UV emission have been studied.