Time-Resolved EPR Studies of Charge Recombination and Triplet-State Formation within Donor−Bridge−Acceptor Molecules Having Wire-Like Oligofluorene Bridges

2010 ◽  
Vol 114 (18) ◽  
pp. 5769-5778 ◽  
Author(s):  
Tomoaki Miura ◽  
Raanan Carmieli ◽  
Michael R. Wasielewski
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Charge Recombination ◽  
Time Resolved ◽  
Acceptor Molecules

Vectorial Charge Separation and Selective Triplet-State Formation during Charge Recombination in a Pyrrolyl-Bridged BODIPY–Fullerene Dyad

2015 ◽  
Vol 119 (15) ◽  
pp. 8095-8102 ◽  
Author(s):  
Venugopal Bandi ◽  
Habtom B. Gobeze ◽  
Vellanki Lakshmi ◽  
Mangalampalli Ravikanth ◽  
Francis D’Souza
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Charge Separation ◽  
Charge Recombination

Time-Resolved EPR Study of Photoexcited Triplet-State Formation in Electron-Donor-Substituted Acridinium Ions

1996 ◽  
Vol 100 (9) ◽  
pp. 3312-3316 ◽  
Author(s):  
Hans van Willigen ◽  
Guilford Jones ◽  
Mohammad S. Farahat
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Electron Donor ◽  
Time Resolved

scholarly journals Ultrafast Charge and Triplet State Formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
René M. Williams ◽  
Hung-Cheng Chen ◽  
Daniele Di Nuzzo ◽  
Stephan C. J. Meskers ◽  
René A. J. Janssen
Keyword(s):  
Triplet State ◽  
Band Gap ◽  
State Formation ◽  
Laser Fluence ◽  
Charge Recombination ◽  
Organic Photovoltaic ◽  
Low Band Gap ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Low Band Gap Polymer

Femtosecond transient absorption spectroscopy of thin films of two types of morphologies of diketopyrrolopyrrole low band gap polymer/fullerene-adduct blends is presented and indicates triplet state formation by charge recombination, an important loss channel in organic photovoltaic materials. At low laser fluence (approaching solar intensity) charge formation characterized by a 1350 nm band (in ~250 fs) dominates in the two PDPP-PCBM blends with different nanoscale morphologies and these charges recombine to form a local polymer-based triplet state on the sub-ns timescale (in ~300 and ~900 ps) indicated by an 1100 nm absorption band. The rate of triplet state formation is influenced by the morphology. The slower rate of charge recombination to the triplet state (in ~900 ps) belongs to a morphology that results in a higher power conversion efficiency in the corresponding device. Nanoscale morphology not only influences interfacial area and conduction of holes and electrons but also influences the mechanism of intersystem crossing (ISC). We present a model that correlates morphology to the exchange integral and fast and slow mechanisms for ISC (SOCT-ISC and H-HFI-ISC). For the pristine polymer, a flat and unstructured singlet-singlet absorption spectrum (between 900 and 1400 nm) and a very minor triplet state formation (5%) are observed at low laser fluence.

Selective Triplet-State Formation during Charge Recombination in a Fullerene/Bodipy Molecular Dyad (Bodipy=Borondipyrromethene)

2009 ◽  
Vol 15 (30) ◽  
pp. 7382-7393 ◽  
Author(s):  
Raymond Ziessel ◽  
Ben D. Allen ◽  
Dorota B. Rewinska ◽  
Anthony Harriman
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Charge Recombination

Time-resolved EPR investigation of charge recombination to a triplet state in a carotene-diporphyrin triad

2006 ◽  
Vol 104 (10-11) ◽  
pp. 1595-1607 ◽  
Author(s):  
M. Di Valentin ◽  
A. Bisol ◽  
G. Agostini ◽  
A. L. Moore ◽  
T. A. Moore ◽  
...  
Keyword(s):  
Triplet State ◽  
Charge Recombination ◽  
Time Resolved

scholarly journals Triplet state formation and quenching dynamics of 2-mercaptobenzothiazole in solution

2016 ◽  
Vol 18 (37) ◽  
pp. 26224-26235 ◽  
Author(s):  
Daisuke Koyama ◽  
Andrew J. Orr-Ewing
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
State Formation ◽  
Absorption Spectroscopy ◽  
Triplet Energy ◽  
Time Resolved ◽  
Vibrational Absorption ◽  
Triplet Energy Transfer

An adduct-mediated triplet energy transfer from a triplet thione to an alkene is observed with time-resolved vibrational absorption spectroscopy.

Effect of Aggregation on Bacteriochlorin a Triplet-state Formation: A Laser Flash Photolysis Study¶

2002 ◽  
Vol 76 (5) ◽  
pp. 480 ◽  
Author(s):  
Xavier Damoiseau ◽  
Francis Tfibel ◽  
Maryse Hoebeke ◽  
Marie-Pierre Fontaine-Aupart
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash
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