Influence of Calcining Process on Optical Properties of Al-doped-ZnO Powders

AZO precursors (x(Al) =5.5mol%, 6.5mol%) were successfully synthesized by the polyacrylamide gel rout. The influence of calcining process on the optical properties of Al-doped-ZnO powders were investigated. It was found that Al concentration in the solution decreased with increasing calcination temperature. The ZnAl2O4 phase was detected in the AZO powders after calcined at 750 With increasing calcination temperature, the wavelength of UV absorbance peak was moved from 366 nm to 377 nm, while the peak displayed blue shift and the intensity was improved with prolonging calcination time. The room temperature photoluminescence spectra showed that emission peaks were composed of ultraviolet peak (354 nm), detectable ultraviolet peak (406 nm) and blue emission peak (430 nm).