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
UR - http://www.scopus.com/inward/record.url?scp=85059264664&partnerID=8YFLogxK
U2 - 10.3390/en11123513
DO - 10.3390/en11123513
M3 - Article
AN - SCOPUS:85059264664
VL - 11
JO - Energies
JF - Energies
IS - 12
M1 - 3513
ER -
