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

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

doi:10.1117/12.452095

18 December 2002 Inter- and intra-molecular energy transfers of encapsulate dyes in dendrimers

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

Proceedings Volume 4798, Linear and Nonlinear Optics of Organic Materials II; (2002) https://doi.org/10.1117/12.452095
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

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, Forster and Dexter types. Inter-molecular interactions between encapsulated dyes can be expressed as the Forster (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.

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Akira Otomo, Minniu Zhou, Seiichi Furumi, Shiyoshi Yokoyama, and Shinro Mashiko "Inter- and intra-molecular energy transfers of encapsulate dyes in dendrimers", Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002); https://doi.org/10.1117/12.452095

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KEYWORDS

Dendrimers

Energy transfer

Molecular energy transfer

Molecules

Absorption

Absorbance

Rhodamine B

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