Single-photon emission from a single nanoparticle consisting of a single conjugated polymer chain

Sadahiro Masuo, Tomoya Tanaka, Takumi Murakami, Akito Masuhara, Shinjiro Machida, Hitoshi Kasai, Hidetoshi Oikawa, Akira Itaya

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Single-photon behavior in the emission from a single nanoparticle consisting of a single poly[2-methoxy-5-(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.

Original languageEnglish
Pages (from-to)805-808
Number of pages4
JournalSynthetic Metals
Issue number9-10
Publication statusPublished - 2009 May


  • Antibunching
  • Conjugated polymer
  • Nanoparticle
  • Single molecule
  • Single photon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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