Inter- and intra-molecular energy transfers of encapsulated dyes in dendrimers

Akira Otomo, Minniu Zhou, Seiichi Furumi, Shiyoshi Yokoyama, Shinro Mashiko

研究成果: ジャーナルへの寄稿Conference article

抄録

Dendrimers are capable to encapsulate small molecules inside them. Because three-dimensional structures of dendrimers are highly controllable, energy transfers among dye molecules encapsulated inside them can be controlled precisely. Electronic energy transfers from optical excited molecules are categorized into two classes, Förster and Dexter types. Inter-molecular interactions between encapsulated dyes can be expressed as the Förster (singlet-singlet) energy transfer, because the size of dendrimers extends to a few nanometers. We have evaluated time resolved optical responses in rhodamine-cored dendrimer films. Fast decay in fluorescent lifetime is observed and it depends on the dendrimer size. A low generation dendrimer shows lifetime as short as 10 psec without severe quenching of fluorescence. A quadratic dependence of the emission intensity on density of molecules indicates that the origin of the short lifetime is not only energy transfer, but also super-radiance. Since the Dexter (triplet-triplet) energy transfer occurs in short range of 1.0 nm, we attached both donor and acceptor molecules to a dendrimer for investigation. We demonstrated photocrosslinking via triplet-triplet energy transfer from donor molecules encapsulated to acceptors attached at the surface. This procedure of triplet-triplet energy transfer in dendritic molecules opens up way to design novel optical and electrical molecular devices.

元の言語英語
ページ(範囲)37-43
ページ数7
ジャーナルProceedings of SPIE - The International Society for Optical Engineering
4798
DOI
出版物ステータス出版済み - 12 1 2002
外部発表Yes
イベントLinear and Nonlinear Optics of Organic Materials II - Seattle, WA, 米国
継続期間: 7 9 20027 11 2002

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Dendrimers
dendrimers
Energy Transfer
Dyes
Energy transfer
Coloring Agents
dyes
energy transfer
Molecules
molecules
Lifetime
life (durability)
Superradiance
Rhodamines
Optical design
Molecular interactions
Radiance
Optical Design
Quenching
molecular interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

これを引用

Inter- and intra-molecular energy transfers of encapsulated dyes in dendrimers. / Otomo, Akira; Zhou, Minniu; Furumi, Seiichi; Yokoyama, Shiyoshi; Mashiko, Shinro.

:: Proceedings of SPIE - The International Society for Optical Engineering, 巻 4798, 01.12.2002, p. 37-43.

研究成果: ジャーナルへの寄稿Conference article

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