Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
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. Photoluminscence (PL) spectroscopy measurements, performed in situ, reveal that the PL spectrum of the VDP product corresponds to a reference spectrum for solution-synthesized 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. © 2001 Elsevier Science B.V. All rights reserved.
Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
Hiroshi Ito, Reinhold Schwalm
JES
J.A. Barker, D. Henderson, et al.
Molecular Physics
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000