Sustainable Dual-Mode Smart Windows for Energy-Efficient Buildings
- Sílvia C. Nunes*Sílvia C. Nunes*E-mail: [email protected]Chemistry Department, University of Beira Interior, 6200-001 Covilhã, PortugalChemistry Department and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, PortugalMore by Sílvia C. Nunes
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- Sofia M. SaraivaSofia M. SaraivaChemistry Department and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, PortugalMore by Sofia M. Saraiva
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- Rui F. P. PereiraRui F. P. PereiraChemistry Department and Chemistry Center, University of Minho, 4710-057 Braga, PortugalMore by Rui F. P. Pereira
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- Sónia PereiraSónia PereiraCENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, 2829-516 Lisboa, PortugalMore by Sónia Pereira
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- Maria Manuela SilvaMaria Manuela SilvaChemistry Department and Chemistry Center, University of Minho, 4710-057 Braga, PortugalMore by Maria Manuela Silva
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- Luís D. CarlosLuís D. CarlosPhysics Department and CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalMore by Luís D. Carlos
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- Elvira FortunatoElvira FortunatoCENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, 2829-516 Lisboa, PortugalMore by Elvira Fortunato
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- Rute A. S. FerreiraRute A. S. FerreiraPhysics Department and CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalMore by Rute A. S. Ferreira
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- Rosa RegoRosa RegoChemistry Department and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, PortugalMore by Rosa Rego
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- Verónica de Zea Bermudez*Verónica de Zea Bermudez*E-mail: [email protected]Chemistry Department and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, PortugalMore by Verónica de Zea Bermudez
Abstract

Electrochromic devices (ECDs) combining visible/near-infrared (NIR) transparent amorphous indium zinc oxide (a-IZO) external layers with innovative NIR-emitting electrolytes composed of red seaweed-derived κ-carrageenan (κ-Cg) polysaccharide, glycerol (Gly), and erbium triflate (ErTrif3·xH2O) are proposed as a valuable technological solution for the development of smart windows providing less heating demand, less glare and more indoors human comfort for the new generation of energy-efficient buildings. The electrolyte preparation is cheap, clean, and fast. The optimized sample including 50 wt% Gly/κ-Cg and 40 wt% ErTrif3·xH2O/κ-Cg exhibits the highest ionic conductivity (1.5 × 10–4 S cm–1 at 20 °C) and displays ultraviolet (UV)/blue and NIR emissions associated with the κ-Cg-based host and the Er3+ ions (4I15/2 → 4I13/2), respectively. The 5-layer configuration ECD tested demonstrated fast switching time (50 s), high electrochromic contrast (transmittance variations of 46/51% at 550/1000 nm), high optical density change (0.89/0.75 at 550/1000 nm), outstanding coloration efficiency (450th cycle = –15902/–13400 cm2 C–1 and +3072/+2589 cm2 C–1 at 550/1000 nm for coloration and bleaching, respectively), excellent electrochemical stability, and self-healing after mechanical damage. The ECD encompasses two voltage-operated modes: semibright warm (+3.0 V, transmittances of 52/61% at 550/1000 nm) and dark cold (−3.0 V, transmittances of 7/11% at 550/1000 nm).
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