scholarly journals Signatures of Exciton Delocalization and Exciton–Exciton Annihilation in Fluorescence-Detected Two-Dimensional Coherent Spectroscopy

2018 ◽  
Vol 9 (19) ◽  
pp. 5654-5659 ◽  
Author(s):  
Pavel Malý ◽  
Tomáš Mančal
Keyword(s):  
Two Dimensional ◽  
Coherent Spectroscopy ◽  
Exciton Annihilation

scholarly journals Ultrafast Exciton Dynamics in Two Dimensional Covalent Organic Frameworks Reveals Size Dependence to Exciton Diffusion

2020 ◽  
Author(s):  
Nathan C. Flanders ◽  
Matthew S. Kirschner ◽  
Pyosang Kim ◽  
Thomas Fauvell ◽  
Austin Evans ◽  
...  
Keyword(s):  
High Performance ◽  
Transient Absorption ◽  
Domain Size ◽  
Spectroscopic Techniques ◽  
Two Dimensional ◽  
Exciton Dynamics ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Absorption Studies ◽  
Exciton Annihilation

<p>Large singlet exciton diffusion lengths are a hallmark of high performance in organic based devices such as photovoltaics, chemical sensors, and photodetectors. In this study, exciton dynamics of a two-dimensional covalent organic framework, COF- 5, is investigated using ultrafast spectroscopic techniques. Following photoexcitation, the COF-5 exciton decays via three pathways: 1) excimer formation (4 ± 2 ps), 2) excimer relaxation (160 ± 40 ps), and 3) excimer decay (>3 ns). Excitation fluence-dependent transient absorption studies suggest that COF-5 has a relatively large diffusion coefficient (0.08 cm2/s). Furthermore, exciton-exciton annihilation processes are characterized as a function of COF-5 crystallite domain size in four different samples, which reveal domain- size dependent exciton diffusion kinetics. These results reveal that exciton diffusion in COF-5 is constrained by its crystalline domain size. These insights indicate the outstanding promise of delocalized excitonic processes available in 2D COFs, which motivate their continued design and implementation into optoelectronic devices. </p>

scholarly journals Machine learning enabled lineshape analysis in optical two-dimensional coherent spectroscopy

2020 ◽  
Vol 37 (6) ◽  
pp. 1587
Author(s):  
Srikanth Namuduri ◽  
Michael Titze ◽  
Shekhar Bhansali ◽  
Hebin Li
Keyword(s):  
Machine Learning ◽  
Two Dimensional ◽  
Lineshape Analysis ◽  
Coherent Spectroscopy

Two-Dimensional Coherent Spectroscopy of Strained GaAs

2016 ◽  
Author(s):  
Alan D. Bristow ◽  
Brian L. Wilmer ◽  
Daniel Webber ◽  
Kimberley C. Hall
Keyword(s):  
Two Dimensional ◽  
Coherent Spectroscopy

Optical two-dimensional coherent spectroscopy of semiconductor nanostructures

2014 ◽  
Author(s):  
Gaël Nardin ◽  
Travis M. Autry ◽  
Galan Moody ◽  
Rohan Singh ◽  
Hebin Li ◽  
...  
Keyword(s):  
Semiconductor Nanostructures ◽  
Two Dimensional ◽  
Coherent Spectroscopy
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