Emerging tunable window technologies for active transparency tuning

作者：Milan Shrestha, Gih‐Keong Lau, Anil Bastola, Zhenbo Lu, Anand Asundi, Edwin Hang Tong Teo · 发表于：Applied Physics Reviews · 年份：2022 · DOI：10.1063/5.0089856 · 被引用次数：39 · 研究领域：Transition Metal Oxide Nanomaterials、Photonic Crystals and Applications、Glass properties and applications

Most modern high-rise buildings' facades use glasses for esthetics, daylight, and better environmental view through them. However, with the increasing use of a larger area of transparent glasses as walls, the visual privacy preservation of the indoors and heat energy loss through the windows are becoming a rising concern. Recent studies showed that nearly half of the energy consumed in a building goes to heating and air conditioning while approximately 40% of this energy is lost through windows. Windows with tunable optical properties that are generically termed “tunable windows or smart windows or switchable glass” are perceived as a potential solution for these problems. An optically tunable window can adjust the amount of daylighting passing through it, control the heat radiation, and/or change the transparency of the glasses for visual privacy preservation of indoors. Electrochromic glasses, polymer dispersed liquid crystal glasses, and suspended particle devices are available as commercial tunable windows but their high cost, limited optical performance, reliability, and operational complexity are hindering the widespread adaptation. Therefore, several other technologies for low-cost actively tunable windows capable of actively adjusting transparency are increasingly explored. However, most of such new technologies, working based on various optical principles, do not fulfill all the requirements of tunable windows. For instance, some can tune optical transmittance but do...