Abstract
The influence of molecular weight (MW) and chain conformation on single-photon emission from isolated chains of poly[2-methoxy,5-(2′-ethylhexyloxy)-p-phenylene-vinylene] have been investigated. The probability of single-photon emission clearly increased with decreasing MW, and when the polymer chains adopted the “collapsed” conformation, this probability was larger than for the “extended” conformation. Even single polymer chains of high MW behaved as single-photon sources by adopting the collapsed conformation. These results indicate that multi-quantum systems consisting of a large number of chromophores can be made to behave as single-photon sources by appropriately controlling their size.
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