Some aspects affecting transmittance spectra of composite smart film WO3

The transmittance spectra (TS) of sol-gel electrochromic smart film single-doped Mo⁶⁺ and double-doped Mo⁶⁺, Cr ⁶⁺ have been studied in this paper. For the film α-WO ₃ single-doped with Mo⁶⁺, it is evident that the colloid stability increases and that the absorption peak moves to shorter wavelength side nearly 770 nm. For the film double doped with Mo ⁶⁺ and Cr⁶⁺, the peak will move to longer wavelength side nearly 440 nm and infrared band and the threshold voltage will increase from 0.2 to 0.8 V, simultaneously. The optical absorption effect is interrelated to transition process of small polar