Deciphering the Relaxation Mechanism of Red-Emitting Carbon Dots Using Ultrafast Spectroscopy and Global Target Analysis

2021 ◽  
Vol 12 (33) ◽  
pp. 8080-8087 ◽  
Author(s):  
Srijon Ghosh ◽  
Arnab Ghosh ◽  
Goutam Ghosh ◽  
Kritiman Marjit ◽  
Amitava Patra
Keyword(s):  
Carbon Dots ◽  
Ultrafast Spectroscopy ◽  
Relaxation Mechanism ◽  
Target Analysis ◽  
Global Target

scholarly journals Unravelling the Photoprotective Mechanisms of Nature-Inspired Ultraviolet Filters Using Ultrafast Spectroscopy

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3945
Author(s):  
Temitope T. Abiola ◽  
Abigail L. Whittock ◽  
Vasilios G. Stavros
Keyword(s):  
Uv Radiation ◽  
Computational Methods ◽  
Ultrafast Spectroscopy ◽  
Relaxation Mechanism ◽  
Research Interest ◽  
Uv Filters ◽  
Future Design ◽  
The Future ◽  
Current Research Interest ◽  
A Current

There are several drawbacks with the current commercially available ultraviolet (UV) filters used in sunscreen formulations, namely deleterious human and ecotoxic effects. As a result of the drawbacks, a current research interest is in identifying and designing new UV filters. One approach that has been explored in recent years is to use nature as inspiration, which is the focus of this review. Both plants and microorganisms have adapted to synthesize their own photoprotective molecules to guard their DNA from potentially harmful UV radiation. The relaxation mechanism of a molecule after it has been photoexcited can be unravelled by several techniques, the ones of most interest for this review being ultrafast spectroscopy and computational methods. Within the literature, both techniques have been implemented on plant-, and microbial-inspired UV filters to better understand their photoprotective roles in nature. This review aims to explore these findings for both families of nature-inspired UV filters in the hope of guiding the future design of sunscreens.

Unraveling the origin of near-infrared emission in carbon dots by ultrafast spectroscopy

Carbon ◽  
2021 ◽  
Author(s):  
Yoonsang Park ◽  
Tran Minh Dao ◽  
Yujin Kim ◽  
Sungyeon Won ◽  
Young-Hoon Kim ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Ultrafast Spectroscopy ◽  
Near Infrared ◽  
Infrared Emission ◽  
Near Infrared Emission

Optical orientation of electron spins and their relaxation mechanism in n-type GaAs

2013 ◽  
Vol 48 (2) ◽  
pp. 131-136
Author(s):  
MI Miah ◽  
A Staff
Keyword(s):  
Relaxation Mechanism ◽  
Optical Orientation ◽  
Electron Spins

Bangladesh J. Sci. Ind. Res. 48(2), 131-136, 2013 DOI: http://dx.doi.org/10.3329/bjsir.v48i2.15744

Correlating Blocking Temperatures in Single Molecule Magnets with Raman Relaxation

2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Single Molecule ◽  
Energy Barrier ◽  
Thermal Relaxation ◽  
Relaxation Mechanism ◽  
Blocking Temperature ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Key Parameter

We report a six coordinate DyIII single-molecule magnet<br>(SMM) with an energy barrier of 1110 K for thermal relaxation of<br>magnetization. The sample shows no retention of magnetization<br>even at 2 K and this led us to find a good correlation between the<br>blocking temperature and the Raman relaxation regime for SMMs.<br>The key parameter is the relaxation time (𝜏<sub>switch</sub>) at the point where<br>the Raman relaxation mechanism becomes more important than<br>Orbach.

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