The Effects of Molecular Structure on Surface Morphology of Thin Film and Optoelectronic Property of a Fluorophore

A yellow fluorescent material, (2Z)-3-[4,4′′-bis(dimethylamino)-1,1′:4′,1′′-terphenyl-2′-yl]-2-phenylacrylonitrile was synthesized in order to investigate the effect of molecular structure on surface morphology of its thin film and its optoelectronic property. Atomic force microscopy measurment for thin films of 4-(dicyanomethylene)-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran, (2Z)-3-[4,4′′-bis(dimethylamino)-1,1′:4′,1′′-terphenyl-2′-yl]-2-phenylacrylonitrile and (2Z,2′Z)-3,3′-[4,4′′-bis(dimethylamino)-1,1′:4′,1′′-terphenyl-2′,5′-diyl]bis(2-phenylacrylonitrile) represented that surface morphology of thin film of a fluorophore was dependent on its molecular structure such as coplanarity and molecular polarity. Surface morphology of thin film of BDAT-P showed much less amorphous than that of ABCV-P. Atomic force microscopy measurment for BDAT-P and ABCV-P was well corresponding to observed optoelectronic properties of them. The luminance of non-doped devices for BDAT-P and ABCV-P was measured to be 31.6 cd/m2 at 6 V and 249 cd/m2 at 6 V, respectively.