Solar spectral management with electrochromic devices including PMMA films doped with biluminescent ionosilicas

Marita A. Cardoso, Sandra F. H. Correia, Helena M. R. Gonçalves, Rui F. P. Pereira, Sónia Pereira, Teresa M. R. Maria, Elvira Fortunato, Rute A. S. Ferreira, Verónica de Zea Bermudez

Research output: Contribution to journalArticlepeer-review

Abstract

The technological potential of poly(methyl methacrylate) (PMMA)-based composite films doped with lanthanide-doped sol–gel derived ionosilicas (IS-Ln) previously proposed for luminescent down-shifting (LDS) and luminescent solar concentrator (LSC) layers connected to photovoltaic (PV) cells is extended here to electrochromic devices (ECDs), targeting the fabrication of single energy harvesting/conversion/management LSC-LDS/PV/ECD systems. These integrated devices have foreseen application in the windows of future zero-energy buildings of smart cities. The proof-of-concept is given with the report of the electro-optical performance of an ECD comprising an optimized electrolyte film composed of PMMA, IS-Nd, and IS-Eu, and the 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid. This amorphous electrolyte is stable below 160 °C, exhibits high ionic conductivity (2.13 × 10−4 and 8.76 × 10−4 S cm−1 at room temperature and 44 °C, respectively), and emits in the visible (red color) and near-infrared (NIR) spectral regions. The device demonstrated fast switching speed (50 s) and high transparency in the visible-to-NIR spectral regions (transmittance (T) = 79/96/89/77% at 555/1000/1500/1650 nm in the as-prepared state, respectively). Upon application of ±2.5 V for 200 cycles, at the same wavelengths, the Tbleached/Tcolored values were 44/28, 46/26, 39/20, and 27/9%, respectively, and the coloration efficiency (CE) values CEin/CEout values were −302/+181, −381/+228, −446/+267 and −734/+440 cm2 C−1, respectively. [Figure not available: see fulltext.].

Original languageEnglish
JournalJournal Of Sol-Gel Science And Technology
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • 1-Butyl-3-methylimidazolium hexafluorophosphate
  • Electrochromic smart windows
  • Eu and Nd complex anions
  • Imidazolium-based ionosilicas
  • Poly(methyl methacrylate)
  • Sol–gel

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