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TitleLuminescent electrochromic devices for smart windows of energy-efficient buildings
Author(s)Fernandes, Mariana
Freitas, Vânia
Pereira, Sónia
Leones, Rita
Silva, Maria Manuela
Carlos, Luís D.
Fortunato, Elvira
Ferreira, Rute A. S.
Rego, Rosa
Bermudez, Verónica De Zea
siloxane hybrids
lithium triflate
erbium triflate
erbium -diketonate complex
electrochromic devices
NIR-transparent IMO
zero-energy buildings
Poly(ε-caprolatone)/siloxane hybrids
Issue date17-Dec-2018
PublisherMultidisciplinary Digital Publishing Institute
Abstract(s)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<sup>−1</sup>). This hybrid framework was doped with a combination of either, lithium triflate (LiTrif) and erbium triflate (ErTrif<sub>3</sub>), or LiTrif and bisaquatris (thenoyltrifluoroacetonate) erbium (III) ([Er(tta)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>]). The ECD@LiTrif-[Er(tta)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>] device presents a typical Er<sup>3+</sup> 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<sup>2</sup> C<sup>−1</sup> and −8243/+5200 cm<sup>2</sup> C<sup>−1</sup> were achieved at 555 nm on the 400th cycle, for ECD@LiTrif-ErTrif<sub>3</sub> and ECD@LiTrif-[Er(tta)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>], respectively.
AccessOpen access
Appears in Collections:CDQuim - Artigos (Papers)

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