Ultrafast Transient Absorption Studies of Hematite Nanoparticles: The Effect of Particle Shape on Exciton Dynamics

ChemSusChem ◽  
2013 ◽  
Vol 6 (10) ◽  
pp. 1907-1914 ◽  
Author(s):  
Bob C. Fitzmorris ◽  
Jonathan M. Patete ◽  
Jacqueline Smith ◽  
Xiomara Mascorro ◽  
Staci Adams ◽  
...  
Keyword(s):  
Particle Shape ◽  
Transient Absorption ◽  
Hematite Nanoparticles ◽  
Exciton Dynamics ◽  
Ultrafast Transient Absorption ◽  
Absorption Studies

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>

Ultrafast Anisotropic Exciton Dynamics in a Water-Soluble Ionic Carbon Nitride Photocatalyst

2021 ◽  
Author(s):  
Chunyu Li ◽  
Christiane Adler ◽  
Igor Krivtsov ◽  
Dariusz Mitoraj ◽  
Robert Leiter ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Carbon Nitride ◽  
Transient Absorption ◽  
Water Soluble ◽  
Exciton Dynamics ◽  
Fast Charge ◽  
Transfer Processes ◽  
Ultrafast Transient Absorption ◽  
Orientational Dynamics ◽  
Soluble Poly

Ultrafast transient absorption anisotropy spectroscopy (TAA) reveals the orientational dynamics of light-induced excitations in a water soluble poly(heptazine imide). The results provide insights into the fast charge transfer processes in...

Unveiling the dimension-dependence of femtosecond nonlinear optical properties of tellurium nanostructures

2021 ◽  
Author(s):  
Qi Xiao ◽  
Bo Ma ◽  
Xian Fei ◽  
Duan-Wu Liu ◽  
Xin-Ping Zhai ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectroscopy ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Nonlinear Optical Properties ◽  
Transient Absorption Spectroscopy ◽  
Exciton Dynamics ◽  
Ultrafast Transient Absorption ◽  
First Time ◽  
Ultrafast Transient Absorption Spectroscopy

For the first time, strong dimension-dependent femtosecond nonlinear optical properties were demonstrated in a variety of Te nanostructures. Ultrafast transient absorption spectroscopy revealed the dimension-dependent exciton dynamics.

Luminescence tuning and exciton dynamics of Mn-doped CsPbCl3 nanocrystals

Nanoscale ◽  
2017 ◽  
Vol 9 (43) ◽  
pp. 16722-16727 ◽  
Author(s):  
Apurba De ◽  
Navendu Mondal ◽  
Anunay Samanta
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Absorption Measurement ◽  
Exciton Dynamics ◽  
Ultrafast Transient Absorption ◽  
Mn Doped

In Mn-doped CsPbCl3 nanocrystals, Mn photoluminescence is widely tuned from yellow to red and exciton–dopant energy transfer timescales have been estimated through ultrafast transient absorption measurement.

Ultrafast transient absorption studies of ruthenium and rhenium dipyridophenazine complexes bound to DNA and polynucleotides

2003 ◽  
Author(s):  
Caitriona M. Creely ◽  
John M. Kelly ◽  
M. M. Feeney ◽  
S. Hudson ◽  
J. C. Penedo ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Ultrafast Transient Absorption ◽  
Absorption Studies

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>

Two-photon brightness of highly fluorescent imidazopyridine derivatives: two-photon and ultrafast transient absorption studies

2021 ◽  
pp. 118379
Author(s):  
Leandro H. Zucolotto Cocca ◽  
André Pelosi ◽  
Lucas F. Sciuti ◽  
Luis M. G. Abegão ◽  
Kenji Kamada ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Two Photon ◽  
Ultrafast Transient Absorption ◽  
Absorption Studies ◽  
Imidazopyridine Derivatives
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