Document Detail

Recombination Dynamics of Charge Pairs in a Push-Pull Polyfluorene-Derivative.
MedLine Citation:
PMID:  23151039     Owner:  NLM     Status:  Publisher    
We investigate the properties of long-lived species, such as geminate electron-hole pairs, in F8BT films through time-resolved photoluminescence (PL) measurements at room temperature and 10 K. The kinetics consist of an initial exponential decay τ = 2.26 ns) followed by a weak power-law decay (I(t) ∝ t(-1)) up to at least 1 ms, both of which depend weakly on temperature. From fluence-dependent PL and ultrafast transient absorption (TA) measurements, we confirm that this emission arises from the recombination of geminate charge-pairs generated through singlet-singlet annihilation. This behavior is a consequence of the donor-acceptor nature of this polymer, which enhances singlet-singlet annihilation and facilitates the formation of long-lived geminate-pairs from energetic singlet states.
Simon Gélinas; James Kirkpatrick; Ian A Howard; Kerr Johnson; Mark W B Wilson; Giuseppina Pace; Richard H Friend; Carlos Silva
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-14
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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