Spatial photon confinement and super-radiation from dye cored dendrimer

Shiyoshi Yokoyama, Akira Otomo, Tatsuo Nakahama, Shinro Mashiko

Research output: Contribution to journalConference article

18 Citations (Scopus)

Abstract

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
Volume393
Issue number1-2
DOIs
Publication statusPublished - Aug 1 2001
Event4th International Conference on Nano-Molecular Electronics - Kobe, Japan
Duration: Dec 5 2000Dec 7 2000

Fingerprint

Dendrimers
dendrimers
Chromophores
chromophores
Coloring Agents
Photons
Dyes
dyes
Radiation
rhodamine B
Spontaneous emission
Fluorescence
photons
radiation
rhodamine
fluorescence
spontaneous emission
preparation
Rhodamines
Photoexcitation

All Science Journal Classification (ASJC) codes

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

Cite this

Spatial photon confinement and super-radiation from dye cored dendrimer. / Yokoyama, Shiyoshi; Otomo, Akira; Nakahama, Tatsuo; Mashiko, Shinro.

In: Thin Solid Films, Vol. 393, No. 1-2, 01.08.2001, p. 124-128.

Research output: Contribution to journalConference article

Yokoyama, Shiyoshi ; Otomo, Akira ; Nakahama, Tatsuo ; Mashiko, Shinro. / Spatial photon confinement and super-radiation from dye cored dendrimer. In: Thin Solid Films. 2001 ; Vol. 393, No. 1-2. pp. 124-128.
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