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

Fingerprint

Electrochromic devices
Energy Efficient
Lithium
Erbium
Infrared radiation
Infrared
Electrolyte
Electrolytes
Oxides
Molybdenum oxide
Charge density
Sol-gel
Reversibility
Indium
Cycling
Sol-gels
Molecular weight
High Efficiency
Buildings
Figure

Keywords

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

Cite this

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
Fernandes, Mariana ; Freitas, Vânia ; Pereira, Sónia ; Leones, Rita ; Silva, Maria Manuela ; Carlos, Luís D. ; Fortunato, Elvira ; Ferreira, Rute A. S. ; Rego, Rosa ; de Zea Bermudez, Verónica. / Luminescent electrochromic devices for smart windows of energy-efficient buildings. In: Energies. 2018 ; Vol. 11, No. 12.
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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.",
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note = "This research was funded by National Funds through the Foundation for Science and Technology (FCT) and by FEDER funds through the POCI-COMPETE 2020, Operational Programme Competitiveness and Internationalisation in Axis I: Strengthening research, technological development and innovation (FCT Ref. UID/QUI/00616/2013, POCI-01-0145-FEDER-007491, FCT Ref. UID/Multi/00709/2013), and LUMECD (POCI-01-0145-FEDER-016884 and PTDC/CTM-NAN/0956/2014).",
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Fernandes, M, Freitas, V, Pereira, S, Leones, R, Silva, MM, Carlos, LD, Fortunato, E, Ferreira, RAS, Rego, R & de Zea Bermudez, V 2018, 'Luminescent electrochromic devices for smart windows of energy-efficient buildings', Energies, vol. 11, no. 12, 3513. https://doi.org/10.3390/en11123513

Luminescent electrochromic devices for smart windows of energy-efficient buildings. / Fernandes, Mariana; Freitas, Vânia; Pereira, Sónia; Leones, Rita; Silva, Maria Manuela; Carlos, Luís D.; Fortunato, Elvira; Ferreira, Rute A. S.; Rego, Rosa; de Zea Bermudez, Verónica.

In: Energies, Vol. 11, No. 12, 3513, 01.12.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Luminescent electrochromic devices for smart windows of energy-efficient buildings

AU - Fernandes, Mariana

AU - Freitas, Vânia

AU - Pereira, Sónia

AU - Leones, Rita

AU - Silva, Maria Manuela

AU - Carlos, Luís D.

AU - Fortunato, Elvira

AU - Ferreira, Rute A. S.

AU - Rego, Rosa

AU - de Zea Bermudez, Verónica

N1 - This research was funded by National Funds through the Foundation for Science and Technology (FCT) and by FEDER funds through the POCI-COMPETE 2020, Operational Programme Competitiveness and Internationalisation in Axis I: Strengthening research, technological development and innovation (FCT Ref. UID/QUI/00616/2013, POCI-01-0145-FEDER-007491, FCT Ref. UID/Multi/00709/2013), and LUMECD (POCI-01-0145-FEDER-016884 and PTDC/CTM-NAN/0956/2014).

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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.

AB - 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.

KW - Electrochromic devices

KW - Erbium triflate

KW - Erbium β-diketonate complex

KW - Lithium triflate

KW - NIR-transparent IMO

KW - Poly(ε-caprolatone)/siloxane hybrids

KW - Sol–gel

KW - Zero-energy buildings

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U2 - 10.3390/en11123513

DO - 10.3390/en11123513

M3 - Article

VL - 11

JO - Energies

JF - Energies

SN - 1996-1073

IS - 12

M1 - 3513

ER -

Fernandes M, Freitas V, Pereira S, Leones R, Silva MM, Carlos LD et al. Luminescent electrochromic devices for smart windows of energy-efficient buildings. Energies. 2018 Dec 1;11(12). 3513. https://doi.org/10.3390/en11123513