Journal
SYNTHETIC METALS
Volume 159, Issue 9-10, Pages 805-808Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2009.01.009
Keywords
Conjugated polymer; MEH-PPV; Nanoparticle; Single molecule; Single photon; Antibunching
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Single-photon behavior in the emission from a single nanoparticle consisting of a single poly[2-methoxy5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV, molecular weight: 2.600,000 amu) chain has been investigated. Photon correlation measurements of a number of single nanoparticles revealed that the probability of single-photon emission from the single nanoparticles clearly increases, compared with that of single chains embedded in host polymer matrices, poly(methyl methacrylate) (PMMA) and polystyrene (PS). The result suggested that even a single MEH-PPV chain with high molecular weight, which does not exhibit single-photon emission in PMMA and PS, is forced to exhibit single-photon emission by adopting compact chain conformation like nanoparticle. Efficient exciton migration and exciton annihilation processes in the compact chain conformation most probably result in the efficient single-photon emission from the single nanoparticle. The present results indicate that multi-quantum systems consisting of a large number of chromophores, such as the MEH-PPV, can be made to behave as single-photon sources by appropriately controlling their size. (C) 2009 Elsevier B.V. All rights reserved
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