Luminescent electrochromic devices for smart windows of energy-efficient buildings

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

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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 (ErTrif3), or LiTrif and bisaquatris (thenoyltrifluoroacetonate) erbium (III) ([Er(tta)3(H2O)2]). The ECD@LiTrif-[Er(tta)3(H2O)2] device presents a typical Er3+ NIR emission around 1550 nm. The figures of merit of these devices are high cycling stability, good reversibility, and unusually high coloration efficiency (CE = ∆OD/∆Q, where Q is the inserted/de-inserted charge density). CE values of −8824/+6569 cm2 C 1 and −8243/+5200 cm2 C 1 were achieved at 555 nm on the 400th cycle, for ECD@LiTrif-ErTrif3 and ECD@LiTrif-[Er(tta)3(H2O)2], respectively.

Original languageEnglish
Article number3513
JournalEnergies
Volume11
Issue number12
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Electrochromic devices
  • Erbium triflate
  • Erbium β-diketonate complex
  • Lithium triflate
  • NIR-transparent IMO
  • Poly(ε-caprolatone)/siloxane hybrids
  • Sol–gel
  • Zero-energy buildings

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    Fernandes, M., Freitas, V., Pereira, S., Leones, R., Silva, M. M., Carlos, L. D., ... de Zea Bermudez, V. (2018). Luminescent electrochromic devices for smart windows of energy-efficient buildings. Energies, 11(12), [3513]. https://doi.org/10.3390/en11123513