Development of Photochromic Two-Photon Absorption Dyes

ABSTRACT We synthesized three photochromic two-photon absorptive diarylethene derivatives with styrylbenzene unit and measured two-photon absorption cross-sections at 800 nm by using an open aperture Z-scan method with 120 femtosecond pulses. It was found that two of the dyes have large values (δ = 52 GM) equivalent to AF-50.