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Proceedings Paper

Multibranched and dendritic organic materials with high two-photon absorption activity
Author(s): Seung-Wan Kang; Joo Yeon Kim; Ran Hee Kim; Bong-Keun So; Kwang-Sup Lee; In-Wook Hwang; Dongho Kim; Paul A. Fleitz; Hong-Bo Sun; Satoshi Kawata
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Paper Abstract

A three-dimensional micro-object was fabricated by two-photon initiated photopolymerization (TPIP) of soft-resin with the efficient two-photon absorbing multi-branched chromophore, EPS-3arm, which possesses high two-photon absorption cross-section of 5.21×10-47 cm4s/photons at 700 nm. The structural stability of the fabricated micro-objects could be achieved with aid of sol-gel process. The two-photon absorbing stilbazolium-cored dendrimer was also synthesized. The stillbazolium chromophore was covalently linked with the dendrimer chains so as to restrict free conformation motion. The hindered molecular twisting motion of the stilbazolium dye within the dendrimer is responsible for 5 to 16 times of enhancement in fluorescence emission along with the increased emission lifetime. The steady-state and time-resolved fluorescence emission study of the solid-state film indicate an efficient site-isolation and restriction of conformation motion of the active two-photon chromophore.

Paper Details

Date Published: 16 December 2004
PDF: 8 pages
Proc. SPIE 5621, Optical Materials in Defence Systems Technology, (16 December 2004); doi: 10.1117/12.582709
Show Author Affiliations
Seung-Wan Kang, Hannam Univ. (South Korea)
Joo Yeon Kim, Hannam Univ. (South Korea)
Ran Hee Kim, Hannam Univ. (South Korea)
Bong-Keun So, Hannam Univ. (South Korea)
Kwang-Sup Lee, Hannam Univ. (South Korea)
In-Wook Hwang, Yonsei Univ. (South Korea)
Dongho Kim, Yonsei Univ. (South Korea)
Paul A. Fleitz, Air Force Research Lab. (United States)
Hong-Bo Sun, Osaka Univ. (Japan)
Satoshi Kawata, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 5621:
Optical Materials in Defence Systems Technology
Anthony W. Vere; James G. Grote; Francois Kajzar, Editor(s)

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