All-solid-state switchable mirror glass was prepared by magnetron sputtering. The device exhibited the multi-layer structure of Mg4Ni/Pd/Ta2O5 on WO3/ITO/glass substrate. The Mg4Ni, Pd, and Ta2O5 in the device acted as optical switches, proton injector and solid electrolyte, respectively. Reactive DC magnetron sputtering was employed as a new deposition method for Ta2O5 OF electrolyte thin film for the device. The transmittance of the device, at a wavelength of 670nm using reactive DC-sputtered Ta2O5 thin film, reached 0.1% (a reflective state) to 48% (a transparent state). The transmittance change occurred in less than 40s when 5V was applied, and the switching speed was 60 times faster than that of the device using reactive RF-sputtered Ta2O5 thin film. (c) 2007 Elsevier B.V. All rights reserved.