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Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings

Author

Listed:
  • Mariana Fernandes

    (Department of Chemistry and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal)

  • Vânia Freitas

    (Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal)

  • Sónia Pereira

    (CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal)

  • Rita Leones

    (Department of Chemistry, University of Minho, Gualtar, 4710-057 Braga, Portugal
    Current address: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V., Institute for Complex Materials, D-01069 Helmholtzstr, Germany)

  • Maria Manuela Silva

    (Department of Chemistry, University of Minho, Gualtar, 4710-057 Braga, Portugal)

  • Luís D. Carlos

    (Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal)

  • Elvira Fortunato

    (CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal)

  • Rute A. S. Ferreira

    (Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal)

  • Rosa Rego

    (Department of Chemistry and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal)

  • Verónica De Zea Bermudez

    (Department of Chemistry and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal)

Abstract

To address the challenges of the next generation of smart windows for energy-efficient buildings, new electrochromic devices (ECDs) are introduced. These include indium molybdenum oxide (IMO), a conducting oxide transparent in the near-infrared (NIR) region, and a NIR-emitting electrolyte. The novel electrolytes are based on a sol-gel-derived di-urethane cross-linked siloxane-based host structure, including short chains of poly (ε-caprolactone) (PCL(530) (where 530 represents the average molecular weight in g mol −1 ). This hybrid framework was doped with a combination of either, lithium triflate (LiTrif) and erbium triflate (ErTrif 3 ), or LiTrif and bisaquatris (thenoyltrifluoroacetonate) erbium (III) ([Er(tta) 3 (H 2 O) 2 ]). The ECD@LiTrif-[Er(tta) 3 (H 2 O) 2 ] device presents a typical Er 3+ NIR emission around 1550 nm. The figures of merit of these devices are high cycling stability, good reversibility, and unusually high coloration efficiency (CE = ΔOD/ΔQ, where Q is the inserted/de-inserted charge density). CE values of −8824/+6569 cm 2 C −1 and −8243/+5200 cm 2 C −1 were achieved at 555 nm on the 400th cycle, for ECD@LiTrif-ErTrif 3 and ECD@LiTrif-[Er(tta) 3 (H 2 O) 2 ], respectively.

Suggested Citation

  • Mariana Fernandes & Vânia Freitas & Sónia Pereira & Rita Leones & Maria Manuela Silva & Luís D. Carlos & Elvira Fortunato & Rute A. S. Ferreira & Rosa Rego & Verónica De Zea Bermudez, 2018. "Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings," Energies, MDPI, vol. 11(12), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3513-:d:191103
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    References listed on IDEAS

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    1. Tavares, P.F. & Gaspar, A.R. & Martins, A.G. & Frontini, F., 2014. "Evaluation of electrochromic windows impact in the energy performance of buildings in Mediterranean climates," Energy Policy, Elsevier, vol. 67(C), pages 68-81.
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    Cited by:

    1. Mikhail Vasiliev & Mohammad Nur-E-Alam & Kamal Alameh, 2019. "Recent Developments in Solar Energy-Harvesting Technologies for Building Integration and Distributed Energy Generation," Energies, MDPI, vol. 12(6), pages 1-23, March.
    2. Paulo Joaquim Nunes & Rui Francisco Pinto Pereira & Sónia Pereira & Maria Manuela Silva & Elvira Fortunato & Verónica de Zea Bermudez & Mariana Fernandes, 2022. "Sol-Gel Derived Di-Ureasil Based Ormolytes for Electrochromic Devices," Energies, MDPI, vol. 16(1), pages 1-12, December.

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