Modulating Energy Migration in Polymers Timothy M' Swager, MIT

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Modulating Energy Migration in PolymersTimothy
M. Swager, MIT
Polymers Organized in Nematic Liquid Crystals
Exhibit Enhanced Optical Signal Transmission to
Low Energy Emissive Sites at Their Termini
Organization Gives Large Increase in 500nm
End-Group Emission and Dramatic Increases in
Quantum Yields
25C Nematic Phase
60C Isotropic Phase
Nesterov, E. E. Zhu, Z. Swager, T. M.
Conjugation Enhancement of Intramolecular
Exciton Migration in Poly(p-phenylene-ethynylene)s
" J. Am. Chem. Soc. 2005, 127, 10083-10088.
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Energy Migration is Favored by Increased
Conjugation
Conjugation Enhanced Endgroup Emission in LC
Phase
Fluorescence spectra of endcapped polymer in the
nematic LC phase at 25 C (solid line) and after
heating the same solution into its isotropic
phase at 60 C (dashed line).
E. Nesterov