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Characterization of drop-on-demand microdroplet printing

  • Jin Xin ZhouEmail author
  • Jerry Y. H. Fuh
  • Han Tong Loh
  • Yoke San Wong
  • Yuan Song Ng
  • Jeffrey J. Gray
  • Soo Jin Chua
ORIGINAL ARTICLE

Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been used extensively in the fabrication of polymer light-emitting diode displays by drop-on-demand inkjet printing technique. In order to make a good thin film with high uniformity, it is crucial to control the drying behavior of inkjet-printed PEDOT:PSS droplets. In this work, the morphology of printed drops of ∼10 pL after drying was examined and explained in a qualitative manner, which would extend the comparison with previous work described in published literature. Results show that drying behavior is sensitive to substrate temperature due to the high surface-to-volume ratio of a microfluid. There exists an appropriate range of temperatures to obtain a good drop with sharp edge and flat surface. On the other hand, when the temperature exceeds a limit, a ring-like structure was observed. Results from this experiment would be considered as a reference to achieve uniform film after drying and has potential to be applied in the modeling of drop impact.

Keywords

PEDOT:PSS PLED Drop-on-demand Inkjet printing Drying behavior 

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Copyright information

© Springer-Verlag London Limited 2009

Authors and Affiliations

  • Jin Xin Zhou
    • 1
    Email author
  • Jerry Y. H. Fuh
    • 1
  • Han Tong Loh
    • 1
  • Yoke San Wong
    • 1
  • Yuan Song Ng
    • 1
  • Jeffrey J. Gray
    • 2
  • Soo Jin Chua
    • 2
  1. 1.Department of Mechanical EngineeringNational University of SingaporeSingaporeSingapore
  2. 2.Institute of Materials Research and Engineering (IMRE)SingaporeSingapore

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