Autors: Aleksandrova, M. P.
Title: Improvement of the Electrical Characteristics of Polymer Electroluminescent Structures by Using Spray-Coating Technology
Keywords: Spray deposition, Organic thin films, Electroluminescent structures, Trap factor

Abstract: In this article, polyphenylenevinylene derivative PPV-D thin films were deposited by spray deposition and spin-coating. Film morphology was investigated by scanning electron microscopy images and surface profile diagrams. The traps concentration depending on the deposition method was evaluated based on current–voltage characteristics of ITO/PPV-D/Al structures measured at different temperatures. Brightness– voltage characteristics of the structures containing spray deposited and spin-coated PPV-D films with the same thickness were measured. The film surface at spray deposition tends to be uniform and smoother than the spin-coated one. The structure with sprayed polymer layer showed higher maximal trap factor (0.94 9 103 vs 0.83 9 103 for spin-coating), which is evidence for less defects in the bulk and presence of more free carriers, contributing to the conduction and the radiative recombination. Twice-higher luminance and 1.4 V lower turn-on voltage were achieved, using spray.

References

    Issue

    Journal of Coatings Technology and Research, vol. 9, issue 2, pp. 157–161, 2012, United States, Springer

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    Вид: публикация в международен форум, публикация в издание с импакт фактор, публикация в реферирано издание