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Proceedings Paper

New paradigm in NLO chromophore design through a gradient bridge concept
Author(s): Daniel M. Casmier; Philip A. Sullivan; Olivier Clot; Kimberly A. Firestone; Bruce E. Eichinger; Susan Lee; Steve Heller; Ariel Brumbaugh; Bjorn Millard; Larry R. Dalton
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Paper Abstract

In pursuit of greater understanding of structure property relationships in NLO chromophores, a series of molecules consisting of three aromatic rings was synthesized. The relative positions of benzene and thiophene rings in these molecules were varied. Theoretical calculations also suggest that the use of a slightly electron deficient heteroaromatic, such as thiazole, can increase β through the concept of an electronic gradient. The use of this heteroaromatic in the correct orientation can compensate for the energetic barrier that benzene presents during charge-transfer. Hyper-Raleigh Scattering (HRS) measurements on three of these “gradient bridge” type chromophores show that benzene located at the donor end provided the highest hyperpolarizability. The poor solubility of these three-ring systems severely limited their processability and gave considerable synthetic challenges. The difference in theoretical and experimental trends of β are discussed.

Paper Details

Date Published: 18 June 2004
PDF: 10 pages
Proc. SPIE 5351, Organic Photonic Materials and Devices VI, (18 June 2004); doi: 10.1117/12.527806
Show Author Affiliations
Daniel M. Casmier, Univ. of Washington (United States)
Philip A. Sullivan, Univ. of Washington (United States)
Olivier Clot, Univ. of Washington (United States)
Kimberly A. Firestone, Univ. of Washington (United States)
Bruce E. Eichinger, Univ. of Washington (United States)
Susan Lee, Univ. of Washington (United States)
Steve Heller, Univ. of Washington (United States)
Ariel Brumbaugh, Univ. of Washington (United States)
Bjorn Millard, Univ. of Washington (United States)
Larry R. Dalton, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 5351:
Organic Photonic Materials and Devices VI
James G. Grote; Toshikuni Kaino, Editor(s)

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