scholarly journals Dithieno[3,2-b:2′,3′-d]silole-based conjugated polymers for bioimaging in the short-wave infrared region

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 30798-30804
Author(s):  
Chuantao Gu ◽  
Haicheng Wang ◽  
Xiaoxia Wang ◽  
Shuguang Wen ◽  
Xiaoguang Liu ◽  
...  
Keyword(s):  
Structural Optimization ◽  
Conjugated Polymers ◽  
Quantum Efficiency ◽  
Infrared Region ◽  
Short Wave ◽  
Short Wave Infrared

A D–A type polymer with a SWIR fluorescence quantum efficiency of 4.4% was obtained after structural optimization.

scholarly journals Hyperspectral Multiplexed Biological Imaging of Nanoprobes Emitting in the Short-Wave Infrared Region

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
A. Yakovliev ◽  
R. Ziniuk ◽  
D. Wang ◽  
B. Xue ◽  
L. O. Vretik ◽  
...  
Keyword(s):  
Infrared Region ◽  
Short Wave ◽  
Biological Imaging ◽  
Short Wave Infrared

scholarly journals The short wave near-infrared fluorescence properties of two p-azaquinodimethane (p-AQM)-based conjugated polymers

2020 ◽  
Vol 13 (05) ◽  
pp. 2041003 ◽  
Author(s):  
Yaowei Zhu ◽  
Yawei Miao ◽  
Tingting Xue ◽  
Youchang Liu ◽  
Chunying Zheng ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Biological Tissues ◽  
Infrared Region ◽  
Short Wave ◽  
Quinone Structure ◽  
Living Tissues ◽  
Quinoid Structure

The absorption, scattering, and autofluorescence of biological tissues in short-wave infrared region (SWIR, 900–1700[Formula: see text]nm) are relatively low, so SWIR fluorescence usually has deeper penetration into living tissues, and can show a higher signal-to-noise ratio when used for imaging in vivo. However, there are few types of organic SWIR fluorescent materials currently. In this work, [Formula: see text]-azaquinodimethane ([Formula: see text]-AQM) with a quinoid structure is used as the acceptor unit, and carbazole or fluorene with sp3 hybridization are used as the donor units, two conjugated polymers were synthesized. The quinone structure is conducive to the redshift of absorption and fluorescence spectra, and the sp3 hybridization structure is conducive to weakening the aggregation quenching of polymer fluorescence. PF and PCz exhibited absorption peaks of 492[Formula: see text]nm and 508[Formula: see text]nm, respectively. The emission peaks of the two polymers are 920[Formula: see text]nm and 950[Formula: see text]nm, respectively, both in the short-wave near infrared region. The quantum yield (QY) of PF and PCz is 0.4% and 0.3%, respectively.

scholarly journals Surface Investigation of Photo-Degraded Wood by Colour Monitoring, Infrared Spectroscopy, and Hyperspectral Imaging

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Giorgia Agresti ◽  
Giuseppe Bonifazi ◽  
Luca Calienno ◽  
Giuseppe Capobianco ◽  
Angela Lo Monaco ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Hyperspectral Imaging ◽  
Near Infrared ◽  
Infrared Region ◽  
Short Wave ◽  
Infrared Range ◽  
Surface Chemical ◽  
Colour Changes ◽  
Short Wave Infrared ◽  
Near Infrared Range

The aim of this investigation is to study the changes occurring on the surface of poplar wood exposed to artificial irradiation in a Solar Box. Colour changes were monitored with a reflectance spectrophotometer. Surface chemical modifications were evaluated by measuring the infrared spectra. Hyperspectral imaging was also applied to study the surface wood changes in the visible-near infrared and the short wave infrared wavelength ranges. The data obtained from the different techniques were compared to find the possible correlations in order to evaluate the applicability of the Hyperspectral imaging to investigate wood modifications in a non-invasive modality. The study of colour changes showed an important variation due to photo-irradiation which is the greatest change occurring within the first 24 hours. Infrared spectroscopy revealed that lignin degrades mainly in the first 48 hours. Concerning Hyperspectral imaging, the spectral features in the visible-near infrared range are mainly linked to the spectral shape, whereas in the short wave infrared cellulose and lignin affect shape and reflectance levels. The proposed approach showed that a correlation can be established between colour variation and wood degradation in the visible-near infrared range; furthermore in the short wave infrared region surface chemical changes can be assessed.

scholarly journals Significantly enhanced photoresponse of carbon nanotube films modified with cesium tungsten bronze nanoclusters in the visible to short-wave infrared range

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 39646-39656
Author(s):  
Hao Chen ◽  
Junyi Zhu ◽  
Yang Cao ◽  
Jinquan Wei ◽  
Bocheng Lv ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Visible Light ◽  
Composite Film ◽  
Tungsten Bronze ◽  
Infrared Region ◽  
Short Wave ◽  
Infrared Range ◽  
Average Increase ◽  
Specific Detectivity ◽  
Short Wave Infrared

Compared with CNT film detectors, the CsxWO3–CNT composite film detector shows a significantly enhanced photoresponse from visible light to short-wave infrared region, with an average increase of 400% in responsivity and 549% in specific detectivity.

scholarly journals Люминесцентные свойства в видимом и коротковолновом ИК-спектральных диапазонах апатитов Sr-=SUB=-2-=/SUB=-La-=SUB=-8-x-=/SUB=-Tm-=SUB=-x-=/SUB=-(GeO-=SUB=-4-=/SUB=-)-=SUB=-6-=/SUB=-O-=SUB=-2-=/SUB=- (x= 0.1-1.0)

2020 ◽  
Vol 62 (8) ◽  
pp. 1252
Author(s):  
Я.В. Бакланова ◽  
О.А. Липина ◽  
Л.Л. Сурат ◽  
А.Ю. Чуфаров ◽  
А.П. Тютюнник ◽  
...  
Keyword(s):  
Infrared Region ◽  
Short Wave ◽  
Emission Lines ◽  
Blue Color ◽  
Solid State Method ◽  
Ultraviolet Excitation ◽  
Short Wave Infrared ◽  
First Time ◽  
Spectral Luminescence ◽  
Thermal Stability Of

The Sr2La8-xTmx(GeO4)6O2 (x = 0.1–1.0) solid solutions with the apatite structure were synthesized by the solid-state method for the first time, the spectral-luminescence properties were studied and the prospects of these compounds as phosphors of the visible and short-wave infrared ranges were demonstrated. The luminescence of germanates Sr2La8-xTmx(GeO4)6O2 under ultraviolet excitation is characterized by high blue color purity and color coordinates close to commercially available phosphors. In addition, it was shown that Sr2La8-xTmx(GeO4)6O2 compounds efficiently convert 808 nm laser radiation into a series of emission lines in the spectral range of 1.3–2.2 µm due to successive 3H4 → 3F4 and 3F4 →3H6 transitions in Tm3+ ions. The Sr2La7.6Tm0.4(GeO4)6O2 germanate with a maximum emission intensity in the short-wave infrared region demonstrates high thermal stability of luminescence in the range of 30–220 °С.

scholarly journals A New Vegetation Index in Short-Wave Infrared Region of Electromagnetic Spectrum

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Yucel Cimtay ◽  
Busra Ozbay ◽  
Gokce Nur Yilmaz ◽  
Eda Bozdemir
Keyword(s):  
Vegetation Index ◽  
Infrared Region ◽  
Short Wave ◽  
Electromagnetic Spectrum ◽  
Short Wave Infrared

Tm3+ doped Bi2O3-GeO2 glasses with silver nanoparticles for optical amplifiers in the short-wave-infrared-region

2019 ◽  
Vol 772 ◽  
pp. 58-63 ◽  
Author(s):  
Maylon M. Martins ◽  
Luciana R.P. Kassab ◽  
Davinson M. da Silva ◽  
Cid B. de Araújo
Keyword(s):  
Silver Nanoparticles ◽  
Optical Amplifiers ◽  
Infrared Region ◽  
Short Wave ◽  
Short Wave Infrared

Prism-assembly for dual-band short-wave infrared region line-scan camera

2018 ◽  
Vol 57 (02) ◽  
pp. 1 ◽  
Author(s):  
Bruno Chassagne ◽  
Lucie de Laulanié ◽  
Matthieu Pommiès
Keyword(s):  
Infrared Region ◽  
Short Wave ◽  
Dual Band ◽  
Line Scan ◽  
Short Wave Infrared ◽  
Region Line
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