Spatial photon confinement and super-radiation from dye cored dendrimer

Shiyoshi Yokoyama, Akira Otomo, Tatsuo Nakahama, Shinro Mashiko

Research output: Contribution to journalConference articlepeer-review

18 Citations (Scopus)


This paper describes the preparation of a dendritic macromolecule having a rhodamine B chromophore, called Rh-dendrimer, and the emission properties from the neat films due to the spontaneous emission and super-radiative emission. An important concept to be investigated for material preparation, is the surrounding of a fluorescent chromophore by the dendritic branches. Therefore, a dendrimer becomes a core-shell structure, achieving a high efficiency of fluorescence with little energy transfer and self-quenching. The optical properties from dendrimer were very different from that of a bare chromophore. The Rh-dendrimer showed a high efficiency of fluorescence, while a bared rhodamine chromophore formed a charge transferred complex and exhibited less fluorescence. Under optical excitation with sufficient intensity (I0), the emission intensity was non-linearly increased as a function of the square of the number of molecules (N), giving relation of I∝N2I0. This property can not be adequately explained within the simple picture of spontaneous emission. Results were discussed in terms of cooperative emission.

Original languageEnglish
Pages (from-to)124-128
Number of pages5
JournalThin Solid Films
Issue number1-2
Publication statusPublished - Aug 1 2001
Externally publishedYes
Event4th International Conference on Nano-Molecular Electronics - Kobe, Japan
Duration: Dec 5 2000Dec 7 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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