Electrochromic interference filters fabricated from dense and porous tungsten oxide films

摘要: Abstract Smart windows offer an opportunity to reduce energy consumption. However, the use of multiple optical elements, such as low emittance coatings and electrochromic devices, is detrimental luminous transmittance these high performance windows. Although addition antireflective has helped this problem, some index refraction materials still give rise loss light. We show that replacing single WO3 active coating, main component device, by appropriately designed interference filter can significantly increase transmittance. This based on a stack dense porous layers. first study effect porosity physical properties prepared radio frequency magnetron sputtering. demonstrate overlying coating does not inhibit coloration underlying coating. The best performing films are combined into 27 layer quarter-wave which shown cycle between bleached colored states, while providing attractive transmission. Finally, we discuss various designs transmission device in its state, well potential filters for security devices possessing two levels authentication.