A new class of poly(1,6-heptadiyne)-based photorefractive materials by metathesis polymerization

We utilized the first metathesis reaction to synthesize a new type of photorefractive polymers that contain both a carbazole moiety as a hole transporter and NLO chromophores. These polymers have a long tail band at above 700 nm, indicating the formation of intramolecular charge transfer complexes between the carbazole groups and the conjugated double bonds in the polymer backbone. Also, these polymers show two maximum values of photocurrent around 350 and 700 nm. The electro-optic coefficient (r 33 ) at the wavelength of 1.3 μm for polymer thin films poled around the 85°C were in the range of 1.6 ∼6.3 pm/V The hyperpolarizabilities, , of the resulting polymers were ca. 2.9 x 10 -32 esu. at the incident wavelength of 1.907 μm.