Chromogenics for Sustainable Energy: Some Advances in Thermochromics and Electrochromics

2010 ◽  
Vol 75 ◽  
pp. 55-64 ◽  
Author(s):  
Claes Goran Granqvist ◽  
Sara V. Green ◽  
Shu Yi Li ◽  
N.R. Mlyuka ◽  
Gunnar A. Niklasson ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Recent Progress ◽  
Large Temperature ◽  
Electrochromic Devices ◽  
Temperature Dependent ◽  
Roll Coating ◽  
Coloration Efficiency ◽  
Roll To Roll ◽  
External Stimuli ◽  
Initial Results

Chromogenic materials are able to change their optical properties in response to external stimuli such as temperature (in thermochromic materials) and electrical charge insertion (in electrochromic materials). Below we review some recent advances for these types of materials. Specifically we first discuss the limitations of thermochromic VO2 films for energy efficient fenestration and show from calculations that nanocomposites containing VO2 can have superior properties and display high luminous transmittance and large temperature-dependent solar transmittance modulation. Even better results may be found for nanoparticles of VO2:Mg. In the second part of the paper we survey some recent progress for electrochromic devices and show that W oxide films have increased coloration efficiency when some Ni oxide is added. We also present initial results for flexible electrochromic foils produced by roll-to-roll coating and continuous lamination.

Thermochromism of VO2 Nanoparticles: Calculated Optical Properties and Applications to Energy Efficient Windows

2011 ◽  
Vol 1315 ◽  
Author(s):  
S.-Y. Li ◽  
G. A. Niklasson ◽  
C. G. Granqvist
Keyword(s):  
Optical Properties ◽  
Energy Efficient ◽  
Large Temperature ◽  
Temperature Dependent

ABSTRACTThermochromic materials have temperature-dependent optical properties. This paper discusses the limitations of thermochromic VO2 films for energy efficient fenestration and shows from calculations that nanocomposites containing VO2 can have superior properties and display high luminous transmittance and large temperature-dependent solar transmittance modulation. Even better results may be found for nanoparticles of VO2:Mg.

scholarly journals A Mini-Review: Pyridyl-Based Coordination Polymers for Energy Efficient Electrochromic Application

2021 ◽  
Vol 9 ◽  
Author(s):  
Shiyou Liu ◽  
Ping Zhang ◽  
Jianjian Fu ◽  
Congyuan Wei ◽  
Guofa Cai
Keyword(s):  
Energy Efficient ◽  
High Performance ◽  
Active Material ◽  
Cycling Stability ◽  
Electrochromic Devices ◽  
Switching Speed ◽  
Smart Windows ◽  
Coloration Efficiency ◽  
Fast Switching ◽  
Application Prospects

Electrochromic devices (ECDs) have a broad range of application prospects in many important energy efficient optoelectronic fields, such as smart windows, anti-glare rearview mirrors, low-energy displays, and infrared camouflage. However, there are some factors restricting their development, such as low coloration efficiency, slow switching speed, and poor cycling stability. Coordination polymer (CP) is a promising active material for the fabrication of high-performance ECD because of its ultrahigh coloration efficiency, fast switching speed, and excellent cycling stability. In this review, current advances of CP in energy efficient ECDs are comprehensively summarized and evaluated. Specifically, the effects of composition, coordination bonding, and microstructure of the bipyridine- and terpyridine-based CP on EC performances are introduced and discussed in detail. Then, the challenges and prospects of this booming field are proposed. Finally, the broad application prospects of the CPs-based EC materials and the corresponding devices are also demonstrated, which hold numerous revolutionary effects over our daily life. Hopefully, this review would provide useful guidance and further promote progress on the electrochromic and other optoelectronic fields.

scholarly journals Development of Nano Convergence Films Using a Roll-to-Roll Coating System

2016 ◽  
Vol 17 (3) ◽  
pp. 168-171
Author(s):  
Joong Kook Hwang ◽  
Sang-Mok Chang ◽  
Hoon-Kyu Shin
Keyword(s):  
Coating System ◽  
Roll Coating ◽  
Roll To Roll

scholarly journals Thermal tuning capabilities of semiconductor metasurface resonators

Nanophotonics ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 331-338 ◽  
Author(s):  
Tomer Lewi ◽  
Nikita A. Butakov ◽  
Jon A. Schuller
Keyword(s):  
Optical Switching ◽  
Near Infrared ◽  
Large Temperature ◽  
Infrared Range ◽  
Thermal Excitation ◽  
Optical Elements ◽  
Silicon And Germanium ◽  
Phase Amplitude ◽  
External Stimuli ◽  
Thermal Tuning

AbstractMetasurfaces exploit optical phase, amplitude, and polarization engineering at subwavelength dimensions to achieve unprecedented control of light. The realization of all dielectric metasurfaces has led to low-loss flat optical elements with functionalities that cannot be achieved with metal elements. However, to reach their ultimate potential, metasurfaces must move beyond static operation and incorporate active tunability and reconfigurable functions. The central challenge is achieving large tunability in subwavelength resonator elements, which requires large optical effects in response to external stimuli. Here we study the thermal tunability of high-index silicon and germanium semiconductor resonators over a large temperature range. We demonstrate thermal tuning of Mie resonances due to the normal positive thermo-optic effect (dn/dT>0) over a wide infrared range. We show that at higher temperatures and longer wavelengths, the sign of the thermo-optic coefficient is reversed, culminating in a negative induced index due to thermal excitation of free carriers. We also demonstrate the tuning of high-order Mie resonances by several linewidths with a temperature swing of ΔT<100 K. Finally, we exploit the large near-infrared thermo-optic coefficient in Si metasurfaces to realize optical switching and tunable metafilters.

Shape-changing polymers for biomedical applications

2019 ◽  
Vol 7 (10) ◽  
pp. 1597-1624 ◽  
Author(s):  
Alina Kirillova ◽  
Leonid Ionov
Keyword(s):  
Biomedical Applications ◽  
Recent Progress ◽  
Smart Polymers ◽  
Shape Morphing ◽  
Shape Transformations ◽  
Biomedical Field ◽  
External Stimuli ◽  
Significant Attention

Smart polymers that are capable of controlled shape transformations under external stimuli have attracted significant attention in the recent years due to the resemblance of this behavior to the biological intelligence observed in nature. In this review, we focus on the recent progress in the field of shape-morphing polymers, highlighting their most promising applications in the biomedical field.

Recent progress towards roll-to-roll manufacturing of perovskite solar cells using slot-die processing

2020 ◽  
Vol 5 (1) ◽  
pp. 014006 ◽  
Author(s):  
Hengyue Li ◽  
Chuantian Zuo ◽  
Andrew D Scully ◽  
Dechan Angmo ◽  
Junliang Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Recent Progress ◽  
Perovskite Solar Cells ◽  
Roll To Roll ◽  
Slot Die

Roll-to-roll coating of flexible glass

2016 ◽  
Vol 28 (4) ◽  
pp. 40-44 ◽  
Author(s):  
Carsten Deus ◽  
Jaroslava Salomon ◽  
Uwe Wehner
Keyword(s):  
Roll Coating ◽  
Roll To Roll

scholarly journals Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3513 ◽  
Author(s):  
Mariana Fernandes ◽  
Vânia Freitas ◽  
Sónia Pereira ◽  
Rita Leones ◽  
Maria Silva ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Near Infrared ◽  
Sol Gel ◽  
Average Molecular Weight ◽  
The Novel ◽  
Electrochromic Devices ◽  
Lithium Triflate ◽  
Smart Windows ◽  
Energy Efficient Buildings ◽  
Nir Emission

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.

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