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- Title
Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings.
- Authors
Fernandes, Mariana; Freitas, Vânia; Pereira, Sónia; Leones, Rita; Silva, Maria Manuela; Carlos, Luís D.; Fortunato, Elvira; A. S. Ferreira, Rute; Rego, Rosa; de Zea Bermudez, Verónica
- 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 = ΔOD/ΔQ, 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.
- Subjects
LITHIUM-ion batteries; THIN films; ELECTROCHROMIC devices; ELECTROLYTES; CRYSTAL structure
- Publication
Energies (19961073), 2018, Vol 11, Issue 12, p3513
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en11123513