MoO3-doped Tungsten Oxide Thin Film

MoO3-doped tungsten oxide thin film electrochromism

Adopt square-wave voltage in cycle 50s× 2 to drive the tungsten oxide thin film electrochromism. Coloring voltage is - 1. 7V, bleach voltage is + 1. 9V, and use a spectrophotometer to measure its visible light transmission spectrum and its adjacent area. Doped 2.5% molybdenum trioxide tungsten oxide film is in dark blue state, but mixed with 5% tungsten trioxide oxide film is gray. Below is the transmitted spectrum of tungsten oxide thin film under different doping amount of MoO3 in colored state. From which we can se as the content of Mo increase, the transmittance in the visible spectrum decreased, it increased in the near-infrared region. As the Mo content increases, transmission peak shifts to longer wavelengths.

MoO3-doped tungsten oxide thin film is light yellow in bleached state. Below is the transmitted spectrum of tungsten oxide thin film under different doping amount of MoO3 in bleached state. From which we can see MoO3 dopoing amount has a small influence on the bleached state, transmittance barely changes in the visible spectrum area, but it is lower than the WO3 thin film in colored state.

The colored state of discoloration material is purple blue, the bleached state is yellow. The colored state of WO3 thin film is blue, the bleached state is transparent. So the color of bleached state and colored state of MoO3-doped tungsten oxide thin film is deeper than tungsten oxide thin film. By doping MoO3 by different ratio can change color of tungsten oxide thin film and improve WO3 spectrum absorption property. It provide a broader application prospect for electrochromic device.