电致变色是指材料在改变外加电场作用下实现材料光学属性发生稳定、可逆变化的现象，基于此类特性电致变色材料被广泛应用于非辐射低能耗显示器，电子束印刷技术及传感器，汽车防眩目后视镜和武器装备红外隐身和伪装。本项目计划开发基于纳米钨低价氧化物和多金属氧簇复合型电致变色薄膜，用于构筑能够实现对可见光和近红外线分区、分步可控全固态柔性电致变色器件，更好地发挥其灵动多变的优势，实现一体多能的新型电致变色器件。与已有报道的电致变色器件相比，本项目的创新点和优势在于：（1）高度可控性：可以分光区逐步地、独立地电致变色控制可见光和近红外的透过率；（2）优异的电致变色性能：纳米结构为主体的多酸和钨低价氧化物体系，融合了晶态物质电致变色性能稳定和非晶态电致变色响应速度快的双重优点；（3）广阔的应用领域：全固态柔性电致变色器件可以有效的避免液态变色器件中电解液易泄漏、爆炸危险，可以被任意折叠和弯曲，适用面广。

Electrochromic materials refer to a kind of compounds that can reversibly change light transmission properties in response to voltage and thus allow control over the amount of light transmitted, heat passing through and color appearance. On the basis of such interesting phenomenon, electrochromic materials have been widely used for nonradiative low-energy display device, graphic technology, sensors, dimming rearview mirror and infrared camouflage. In this proposal, we plan to fabricate the tungsten suboxide/polyoxometalates based all-solid-state electrochromic flexible device that can selectively control the transmittance of visible and near-infrared light independently. As a result, such a novel electrochromic device will cater to different needs and create multifunction-in-one. As compared with already reported ones, the electrochromic device of this work possesses several advantages: (1) high controllability: selectively control the transmittance of visible and near-infrared light in independently and stepwise manner: (2) promoted electrochromic properties: the nanostructures used in this study combined the merits of fast-response of amorphous electrochromic materials and high-stability of electrochromic crystalline: (3) high availability: all-solid-state and flexible device is suitable for many applications.