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A series of amorphous molecules that possess both photoconductive and electro-optic properties was synthesized in order to investigate photorefractive propertie s of bifunctional organic-glasses. Diethylaminobenzaldehyde-diphenylhydrazone was covalently attached to 5-(4-diethylamino-benzylidene)-1,3-dimethylpyrimidine-2,4,6-trione through a flexible alkyl chain (3, 4, 5, 6 and 10 carbons) containing two ether linkages. The longer linkage not only lowered the glass transition temperature (T g) of the molecules, but also allowed faster orientation of the chromophore. To examine the photorefractive properties, a 50 µm-thick film was prepared from the mixture of a bifunctional molecule, butyl benzyl phthalate, and C60. The photoconductivity of this composite was as high as 8.01 × 10 −12 S/cm at 60 V/µm, and the maximum diffraction efficiency ( η max) of 50 µm-thick film was about 5% at 80 V/µm.

bulletin of the korean chemical society

Synthesis and Characterization of Bifunctional Organic-Glasses Based on Diphenylhydrazone and Barbituric Acid Derivative for Photorefractive Application