We present a study of vapor-deposition polymerization (VDP) to produce thin layers of poly(phenylquinoxaline) (PPQ), a material that can be used as an electron-transport layer in multilayer
organic electroluminescent devices. The polymer is prepared by the thermally-induced polycondensation reaction of 1,3-bis(phenylglyoxaloyl)benzene and 3,3'-diaminobenzidine. The two monomers are deposited by evaporation onto an atomically clean Au(111) surface under ultrahigh-vacuum conditions. Polymer formation is monitored in situ by scanning tunneling microscopy. Photoluminescence (PL) spectroscopy measurements, performed in situ, reveal that the PL spectrum of the VDP product corresponds to a reference spectrum for solution-synthetized PPQ. For monolayer coverage, polymer clusters are formed with the chains oriented parallel to each other. STM images suggest that the VDP-prepared films can be much smoother and more uniform than films deposited by spin coating.
By: S.F. Alvarado, W. Riess, W. Jandke, and P. Strohriegl
Published in: RZ3315 in 2001
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