Using low-energy near infrared light and upconverting nanoparticles to trigger photoreactions within supramolecular assemblies

2016 ◽  
Vol 52 (56) ◽  
pp. 8636-8644 ◽  
Author(s):  
Tuoqi Wu ◽  
Neil R. Branda
Keyword(s):  
Visible Light ◽  
Near Infrared ◽  
High Energy ◽  
Photochemical Reactions ◽  
Supramolecular Assemblies ◽  
Supramolecular Structures ◽  
Low Energy ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Trivalent Lanthanide

This overview highlights how the high-energy ultraviolet or visible light required to drive photochemical reactions can be overcome by integrating the chromophores into supramolecular structures containing upconverting nanoparticles with trivalent lanthanide dopants (such as Tm3+ and Er3+).

scholarly journals IMAGING DIAGNOSTICS OF COMBUSTION INSTABILITY IN PREMIXED SWIRLING COMBUSTION

2020 ◽  
Vol 4 ◽  
pp. 80-93
Author(s):  
Yao Yang ◽  
Gaofeng Wang ◽  
Yuanqi Fang ◽  
YIfan Xia ◽  
Liang Zhong
Keyword(s):  
Visible Light ◽  
Near Infrared ◽  
Combustion Instability ◽  
Infrared Light ◽  
Imaging Method ◽  
Near Infrared Light ◽  
Stable Combustion ◽  
Significant Difference ◽  
Unstable Combustion ◽  
Swirling Flames

An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.

Detection of Wavelength in the Range from Ultraviolet to Near Infrared Light Using Two Parallel PtSe2/Thin Si Schottky Junctions

2021 ◽  
Author(s):  
Wenhua Yang ◽  
Xinyuan Jiang ◽  
Yutian Xiao ◽  
Can Fu ◽  
Jiankun Wan ◽  
...  
Keyword(s):  
Visible Light ◽  
Image Recognition ◽  
Medical Diagnosis ◽  
Near Infrared ◽  
Visible Light Communication ◽  
Optoelectronic Device ◽  
Infrared Light ◽  
Sensitive Detector ◽  
Near Infrared Light ◽  
Schottky Junctions

Wavelength sensor as a representative optoelectronic device plays an important role in many fields including visible light communication, medical diagnosis, and image recognition. Herein, a wavelength-sensitive detector with a new...

Experimental Characterization and Modeling of Photon Upconversion in Azobenzene Photomechanical Polymers

2015 ◽  
Author(s):  
Sadiyah Sabah Chowdhury ◽  
Catherine Kent ◽  
Sean P. Hill ◽  
Enric Baduell ◽  
Kenneth Hanson ◽  
...  
Keyword(s):  
Visible Light ◽  
Energy Conversion ◽  
Uv Light ◽  
Green Light ◽  
High Energy ◽  
Photochemical Reactions ◽  
Low Energy ◽  
Mechanical Work ◽  
Solar Irradiation ◽  
Azobenzene Polymer

Azobenzene polymers show promising photostrictive behavior for a broad range of applications in flow control, robotics, and energy harvesting applications. The conversion of solar energy directly into mechanical work provides unique capabilities in adaptive structures; however, the energy conversion of visible light into mechanical work presents several material chemistry challenges. Azobenzene strongly absorbs ultraviolet (UV) light and blue/green light which limits the efficiency of the photomechanical response under solar irradiation. Photon upconversion — combining two or more low energy photons (longer wavelength) to generate a higher energy excited state (shorter wavelength), provides an intriguing strategy to drive these high energy photochemical reactions with low energy light. We present an experimental study showing the feasibility to drive azobenzene photoisomerization using visible light via select up-conversion molecules in the fluidic state. Multi-physics modeling is then used to predict advances in photomechanical energy conversion when up-conversion molecules are introduced within an azobenzene polymer.

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