Singlet Exciton Diffusion in Organic Crystals Based on Marcus Transfer Rates

2014 ◽  
Vol 10 (3) ◽  
pp. 1242-1255 ◽  
Author(s):  
Vera Stehr ◽  
Reinhold F. Fink ◽  
Bernd Engels ◽  
Jens Pflaum ◽  
Carsten Deibel
Keyword(s):  
Organic Crystals ◽  
Transfer Rates ◽  
Singlet Exciton ◽  
Exciton Diffusion

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>

Singlet exciton diffusion length in organic light-emitting diodes

2012 ◽  
Vol 85 (24) ◽  
Author(s):  
Simone Hofmann ◽  
Thomas C. Rosenow ◽  
Malte C. Gather ◽  
Björn Lüssem ◽  
Karl Leo
Keyword(s):  
Light Emitting Diodes ◽  
Diffusion Length ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Organic Light

Ultrafast Dynamics and Estimation of Singlet Exciton Diffusion Parameters for Nanoaggregates of peri and bay Anisyl Perylene

2021 ◽  
Author(s):  
Swati J. N. Dixit ◽  
Ankur A. Awasthi ◽  
Kuttay R. S. Chandrakumar ◽  
Biswajit Manna ◽  
Neeraj Agarwal
Keyword(s):  
Ultrafast Dynamics ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Diffusion Parameters

Enhancing exciton diffusion in porphyrin thin films using peripheral carboalkoxy groups to influence molecular assembly

2016 ◽  
Vol 4 (24) ◽  
pp. 5602-5609 ◽  
Author(s):  
Meesha Kaushal ◽  
Angy L. Ortiz ◽  
Jennifer A. Kassel ◽  
Nikolas Hall ◽  
Taesoo D. Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Molecular Assembly ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Molecular Arrangement ◽  
Solution Cast ◽  
Diffusion Properties

The effects of molecular arrangement and orientation on the singlet exciton diffusion properties of carboalkoxyphenylporphyrins were investigated in solution-cast thin films.

scholarly journals Real-Time Tracking of Singlet Exciton Diffusion in Organic Semiconductors

2016 ◽  
Vol 116 (5) ◽  
Author(s):  
Oleg V. Kozlov ◽  
Foppe de Haan ◽  
Ross A. Kerner ◽  
Barry P. Rand ◽  
David Cheyns ◽  
...  
Keyword(s):  
Real Time ◽  
Organic Semiconductors ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Real Time Tracking

On the question of singlet exciton diffusion in anthracene

1970 ◽  
Vol 1-2 ◽  
pp. 254-264 ◽  
Author(s):  
R.C. Powell ◽  
R.G. Kepler
Keyword(s):  
Singlet Exciton ◽  
Exciton Diffusion
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