scholarly journals Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
N. Garino ◽  
S. Zanarini ◽  
S. Bodoardo ◽  
J. R. Nair ◽  
S. Pereira ◽  
...  
Keyword(s):  
Near Infrared ◽  
Switching Time ◽  
Gel Polymer Electrolyte ◽  
Infrared Region ◽  
Electrochromic Devices ◽  
Fast Switching ◽  
Colored State ◽  
Poly Ethylene ◽  
First Time ◽  
Glycol Methyl Ether

An optimized thermoset gel polymer electrolyte based on Bisphenol A ethoxylate dimethacrylate and Poly(ethylene glycol) methyl ether methacrylate (BEMA/PEGMA) was prepared by facile photo-induced free radical polymerisation technique and tested for the first time in electrochromic devices (ECD) combining WO3sputtered on ITO as cathodes and V2O5electrodeposited on ITO as anodes. The behaviour of the prepared ECD was investigated electrochemically and electro-optically. The ECD transmission spectrum was monitored in the visible and near-infrared region by varying applied potential. A switching time of ca. 2 s for Li+insertion (coloring) and of ca. 1 s for Li+de-insertion (bleaching) were found. UV-VIS spectroelectrochemical measurements evidenced a considerable contrast between bleached and colored state along with a good stability over repeated cycles. The reported electrochromic devices showed a considerable enhancement of switching time with respect to the previously reported polymeric ECD indicating that they are good candidates for the implementation of intelligent windows and smart displays.

Chiral carbazole-based porphyrins showing absorption and circular dichroism in the near-infrared region

2020 ◽  
Vol 24 (01n03) ◽  
pp. 247-251
Author(s):  
Chihiro Maeda ◽  
Tadashi Ema
Keyword(s):  
Circular Dichroism ◽  
Near Infrared ◽  
Infrared Region ◽  
Nir Absorption ◽  
Near Infrared Region ◽  
Induced Aggregation ◽  
First Time ◽  
Circular Dichroïsm

Chiral carbazole-based porphyrins were synthesized for the first time via the incorporation of hydrobenzoin units at the thiophene moieties. They showed absorption and circular dichroism in the near-infrared (NIR) region. The NIR absorption was further red-shifted by solvent-induced aggregation.

scholarly journals A Straightforward Substitution Strategy to Tune BODIPY Dyes Spanning the Near-Infrared Region via Suzuki–Miyaura Cross-Coupling

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1297 ◽  
Author(s):  
Guanglei Li ◽  
Yu Otsuka ◽  
Takuya Matsumiya ◽  
Toshiyuki Suzuki ◽  
Jianye Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Cross Coupling ◽  
Cumulus Cells ◽  
Infrared Region ◽  
Quantum Yields ◽  
Nir Dyes ◽  
Wide Range ◽  
One Step ◽  
The One ◽  
First Time

In this study, a series of new red and near-infrared (NIR) dyes derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) were developed by introducing thiophene and its derivatives to the 3- and 5- positions of the dichloroBODIPY core. For the first time, cyclictriol boronates and N-methyliminodiacetic acid (MIDA) boronate were used as organoboron species to couple with 3,5-dichloroBODIPY via the one-step Suzuki–Miyaura cross-coupling. Six kinds of thieno-expended BODIPY dyes were synthesized in acceptable yields ranging from 31% to 79%. All six dyes showed different absorption and emission wavelengths spanning a wide range (c.a. 600–850 nm) in the red and NIR regions with relatively high quantum yields (19–85%). Cellular imaging of 8-(2,6-dimethylphenyl)-re3,5-di(2-thienyl)-BODIPY (dye 1) was conducted using bovine cumulus cells, and the fluorescence microscopy images indicated that the chromophore efficiently accumulated and was exclusively localized in the cytoplasm, suggesting it could be utilized as a subcellular probe. All six dyes were characterized using 1H-NMR and mass spectrometry.

A spectroscopic and theoretical study in the near-infrared region of low concentration aliphatic alcohols

2016 ◽  
Vol 18 (19) ◽  
pp. 13666-13682 ◽  
Author(s):  
Krzysztof B. Beć ◽  
Yoshisuke Futami ◽  
Marek J. Wójcik ◽  
Yukihiro Ozaki
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Near Infrared ◽  
Theoretical Study ◽  
Infrared Region ◽  
Second Order ◽  
Aliphatic Alcohols ◽  
Low Concentration ◽  
Near Infrared Region ◽  
First Time

The near-infrared (NIR) spectra of low-concentration (5 × 10−3 M) solutions in CCl4 of basic aliphatic alcohols, methanol, ethanol, and 1-propanol were, for the first time, calculated by second-order vibrational perturbation theory computations and were compared with the corresponding experimental data.

Hydrated Transition Metal Oxide Films for Reversible Switching in Near IR Region

1997 ◽  
Vol 479 ◽  
Author(s):  
I. Shiyanovskaya ◽  
M. Hepel
Keyword(s):  
Transition Metal ◽  
Transition Metal Oxides ◽  
Near Infrared ◽  
Oxide Films ◽  
Infrared Region ◽  
Light Modulation ◽  
Fast Switching ◽  
Near Ir ◽  
Double Charge

AbstractElectro-optical properties of thin films of hydrated transition metal oxides, WO3 2(H2O) and WO3 1/3(H2O), have been investigated in situ using photoelectrochemical methods. These films can reversibly change their light absorption in the near IR region due to the double charge injection upon the applied electric field in electrolyte media. Taking into account the high stability and fast switching time, these hydrated tungsten oxide films can be utilized for efficient light modulation in the near infrared region of the spectrum.

scholarly journals Optical properties of doping electrochromic M0.125W0.875O3 (M=Mo, Nb, Ta, Ti, V): A first-principles study

2020 ◽  
Author(s):  
Yuanyuan Cui ◽  
Qinfan Wang ◽  
Bin Liu ◽  
Yanfeng Gao
Keyword(s):  
Optical Properties ◽  
First Principles ◽  
Near Infrared ◽  
High Efficiency ◽  
Infrared Region ◽  
Smart Window ◽  
Colored State ◽  
Light Region ◽  
Electrochromic Material ◽  
Ti Doping

Abstract Tungsten trioxide (WO3) is a representative electrochromic material that can change their optical properties under the action of a voltage pulse and has attracted great interest in the applications of energy efficient windows. Models of various W0.125M0.875O3 and LixM0.125W0.875O3 (M=Mo, Nb, Ta, Ti, V) were built to simulate the bleached and colored state of WO3 materials by first-principles calculations, respectively. The calculations show that doping systems of LixM0.125W0.875O3 (M= Nb, Ta, V) lead to an enhancement of the modulation efficiency in invisible light and a decrease in the modulation efficiency in near infrared region (NIR). Ti doping boosts an excellent high efficiency of NIR modulation, while no modulation was observed in the visible light region. Mo doping remarkably promotes the coloration efficiency in both NIR and visible regions. The specific characteristics of doped WO3 systems deserve more exploration of their application in green house or thermal modulation smart window.

Electrochemical and spectroelectrochemical behavior of planar binuclear naphthalocyanines

2011 ◽  
Vol 15 (11n12) ◽  
pp. 1195-1201 ◽  
Author(s):  
Stanislav A. Trashin ◽  
Tatiana V. Dubinina ◽  
Aleksander V. Fionov ◽  
Larisa G. Tomilova
Keyword(s):  
Electrochemical Reduction ◽  
Near Infrared ◽  
Polar Solvent ◽  
Infrared Region ◽  
Neutral Form ◽  
Cation Radicals ◽  
Near Infrared Region ◽  
Intense Absorption ◽  
First Time

The electrochemical and spectroelectrochemical behavior of two planar binuclear naphthalocyanines containing benzene and naphthalene π-conjugated bridges was investigated for the first time. Their intense absorption in the near infrared region was observed even in a low polar solvent such as o-dichlorobenzene after electrochemical reduction at a potential of -0.4 V vs. SCE, which was not enough to reduce the complexes into their first reduction state. These data and EPR studies allow us to conclude that the electrochemically generated form is the true neutral form of the synthesized compounds whereas the suppression of the near-infrared bands is a result of the presence of their cation radicals as one-electron oxidized forms.

scholarly journals Searching for refractory plasmonic materials: the structural and optical properties of Au3Zr intermetallic thin films

2021 ◽  
Author(s):  
Hugh Littlehailes ◽  
William R Hendren ◽  
Stacey Drakeley ◽  
Robert M Bowman ◽  
Fumin Huang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Deposition Temperature ◽  
Room Temperature ◽  
Near Infrared ◽  
Infrared Region ◽  
Negative Permittivity ◽  
Dc Magnetron Sputtering ◽  
Structural And Optical Properties ◽  
First Time

Abstract Optical properties of refractory intermetallic thin films of Au 3 Zr were experimentally investigated for the first time, which show distinctive plasmonic properties in the visible and near infrared region. The films were fabricated through DC magnetron sputtering at various deposition temperature ranging from room temperature to 427°C and annealed at different vacuum levels. Both the structural and optical properties are found to be critically dependent on deposition temperature and anneal conditions. Films deposited between 205-320°C are shown to exhibit lower negative permittivity and better thermal stability, which could be linked to specific crystalline orientations. The films are stable when annealed at 10 -8 Torr, but are partially oxidized when annealed at 10 -6 Torr, suggesting oxidization could be a restricting issue for high-temperature applications in ambient environment.

scholarly journals Silicon-Vacancy Nanodiamonds as High Performance Near-Infrared Emitters for Live-Cell Dual-Color Imaging and Thermometry

2022 ◽  
Author(s):  
Weina Liu ◽  
Md Noor A Alam ◽  
Yan Liu ◽  
Viatcheslav N. Agafonov ◽  
Haoyuan Qi ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Drug Carrier ◽  
Infrared Region ◽  
Live Cell ◽  
Metal Catalyst ◽  
Color Imaging ◽  
Silicon Vacancy ◽  
Dual Color ◽  
First Time

Nanodiamonds (NDs) with color centers are excellent emitters for various bioimaging and quantum biosensing applications. In our work, we explored new applications of NDs with silicon-vacancy centers (SiV) obtained by high-pressure high-temperature (HPHT) synthesis based on metal-catalyst-free growth. They are coated with a polypeptide biopolymer which is essential for efficient cellular uptake. The unique optical properties of NDs with SiV are their high photostability and narrow emission in the near-infrared region. Our results demonstrate for the first time that NDs with SiV allow live-cell dual-color imaging and intracellular tracking. Also, intracellular thermometry as well as challenges associated with SiV atomic defects in NDs are investigated and discussed for the first time. NDs with SiV nanoemitters provide new avenues for live-cell bioimaging, diagnostic (SiV as a nanosized thermometer), and theranostic (nanodiamonds as drug carrier) applications.

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