Linked Life Data

19904426

Source:http://linkedlifedata.com/resource/pubmed/id/19904426

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
45
pubmed:dateCreated
2009-11-11
pubmed:abstractText
Transient and steady state optical spectroscopies were used to study thin films made from a series of polyfluorene polymers blended with [6,6]-phenyl C61 butyric acid methyl ester (PCBM) in order to determine the influence of polymer ionisation potential on photoinduced charge separation. We find that the energy of the charge separated state DeltaE(CS), given by the energy difference between the ionisation potential of the polymer and the electron affinity of the fullerene, must be smaller than a threshold value of about 1.6 eV for charge separation to occur. When DeltaE(CS) is greater than this threshold, PCBM triplet formation is observed in preference to charge pair generation. If DeltaE(CS) is similar to the threshold value, both PCBM triplet formation and charge separation occur in the blend film, with a tendency for charge separation to dominate over PCBM triplet formation as PCBM concentration increases. The mechanism of triplet formation is believed to be energy transfer to the PCBM singlet state followed by intersystem crossing. The threshold value of DeltaE(CS) is found to be similar to the PCBM singlet energy.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Dec
pubmed:issn
1477-9234
pubmed:author
pubmed:issnType
Electronic
pubmed:day
7
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
10000-5
pubmed:year
2009
pubmed:articleTitle
Charge separation and fullerene triplet formation in blend films of polyfluorene polymers with [6,6]-phenyl C61 butyric acid methyl ester.
pubmed:affiliation
Department of Physics, Imperial College London, London, UK, SW7 2BW.
pubmed:publicationType
Journal Article