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The electrolytes are composed of a di\u2010urethane cross\u2010linked poly(oxyethylene)(POE)\/siloxane hybrid matrix (d\u2010Ut(600), 600 is the average molecular weight of the POE chains in gmol<jats:sup>\u22121<\/jats:sup>), 1\u2010butyl\u20103\u2010methylimidazolium chloride ionic liquid, and the Er(tta)<jats:sub>3<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub> complex (tta<jats:sup>\u2212<\/jats:sup> is 2\u2010thenoyltrifluoracetonate). The electrolytes, synthesized by sol\u2010gel route, were obtained as transparent, flexible, and hydrophilic monoliths with nanoscale surface roughness, exhibiting emission in the NIR wavelength region. The first electro\u2010optical tests, performed in 2019, with an archetypal ECD including amorphous tungsten oxide and crystalline nickel oxide as EC layers, a\u2010IZO as outermost layers, and d\u2010Ut(600)<jats:sub>400<\/jats:sub>Er(tta)<jats:sub>3<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>[Bmim]Cl (400 is the molar ratio of oxyethylene units\/Er<jats:sup>3+<\/jats:sup> ion) as the electrolyte, demonstrated rather low coloration efficiency (CE<jats:sub>in<\/jats:sub>\/CE<jats:sub>out<\/jats:sub>) values of \u22124\/+6\u2005cm<jats:sup>2<\/jats:sup>\u2009C<jats:sup>\u22121<\/jats:sup> at 555\u2005nm. After 3\u2005years of storage at rest in the dark and at room temperature, the same device demonstrates a huge performance enhancement, leading to CE<jats:sub>in<\/jats:sub>\/CE<jats:sub>out<\/jats:sub> values about two orders of magnitude higher, apart from higher optical density, and improved cycling stability. In addition, this device offers a bright hot, and semi\u2010bright warm dual modulation operation suitable for smart windows of skylights, roof lights, upper windows, inclined glazing, and privacy glazing of buildings located in cold climate regions.<\/jats:p>","DOI":"10.1002\/celc.202300479","type":"journal-article","created":{"date-parts":[[2023,12,29]],"date-time":"2023-12-29T21:49:55Z","timestamp":1703886595000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["NIR\u2010emitting Electrochromic Windows for Cold Climate Region Buildings"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5897-6020","authenticated-orcid":false,"given":"Daniela","family":"Pinheiro","sequence":"first","affiliation":[{"name":"Chemistry Department and CQ-VR University of Tr\u00e1s-os-Montes e Alto Douro  5000-801 Vila Real Portugal"},{"name":"Present address: CPIRN-IPG \u2013 Center of Potential and Innovation of Natural Resources Polytechnic of Guarda  6300-559 Guarda Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6533-4309","authenticated-orcid":false,"given":"Mariana","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Chemistry Department and CQ-VR University of Tr\u00e1s-os-Montes e Alto Douro  5000-801 Vila Real Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7279-5728","authenticated-orcid":false,"given":"Rui F. 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