Two-photon excitation behavior of thiophene-based oligomers and a polymer.
The two-photon excitation action cross-sections of four kinds of co-oligomers of thiophene and pyridine (e.g., Py-(Th)n-Py; Py = 2-pyridyl, Th = thiophene-2,5-diyl; n = 3, 4) and a copolymer constituted of alternating pyridazine and 4,4'-dihexyl-2,2'-bithiophene units have been measured by using a reported value (sigma2PE at 780 nm = 10 GM) of green fluorescent protein as the reference. The co-oligomers give sigma2PE values of 14-26 GM and the copolymer shows sigma2PE of 23 GM.
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Takakazu
T
Yamamoto
Akira
A
Kumagai
Kenta
K
Saito
Takeharu
T
Nagai