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Time-Resolved Spectral Measurement of Dendrimer Molecular Films with Rhodamine B Core

Published online by Cambridge University Press:  15 March 2011

M. Zhou ,
A. Otomo ,
S. Yokoyama  and
S. Mashiko
M. Zhou
Affiliation:
Kansai Advanced Research Center, Communications Research Laboratory 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan
A. Otomo
Affiliation:
Kansai Advanced Research Center, Communications Research Laboratory 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan
S. Yokoyama
Affiliation:
Kansai Advanced Research Center, Communications Research Laboratory 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan
S. Mashiko
Affiliation:
Kansai Advanced Research Center, Communications Research Laboratory 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan
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Abstract

We investigated molecular thin films fabricated using novel organic materials, such as dendrimers with a rhodamine B (Rh-B) core, by a pump-probe measurement for ultrafast time-resolved spectroscopy with a time resolution of approximately 160 fs. The photon energy transfer caused by the interaction of the dendrimer molecules was measured in terms of absorbance. The wavelength of the pump light was 550 nm and a white continuum light spanning from 450 nm to 750 nm was used as a probe light. A spin-coated molecular film made of dendrimer molecules with Rh-B core has a relatively high molecular density. We measured a strong stimulated emission at a wavelength of 612 nm, whose fast decay was assumed to be caused by intermolecular interactions between the dendrimer molecules with Rh-B core. The lifetime of the molecules in the excited state was measured to be as short as 10 ps. Several types of molecular films with different molecular densities were compared, and cases with different pump energies were also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB3.16
Copyright
Copyright © Materials Research Society 2002

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References

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