Fabrication of organic light-emitting diode arrays on flexible plastic substrates by imprint lithography

Chiao Yang Cheng, Franklin Chau Nan Hong

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Imprint lithography has been employed as a patterning technology for the fabrication of organic light-emitting diode (OLED) device arrays on flexible poly(ethylene terephthalate) (PET) substrates. Poly(methyl methacrylate) (PMMA) was used as the etching barrier coated on an indium tin oxide (ITO)/PET substrate. A silicon mold fabricated by photolithography was coated with a fluorinated diamond-like carbon film for easy mold-releasing. By hot pressing the silicon mold on the PMMA-coated ITO/PET substrate and etching in oxalic acid solution, patterned ITO strips were obtained. Imprint lithography was repeated to fabricate PMMA ribs vertical to the ITO strips. Finally, a matrix of 40 × 40 OLED devices (300 × 300 μm2) was fabricated with an area of 25 × 25 mm2 after depositing the organic and cathode layers consisting of TPD/Alq3/Bphen/LiF/Al. High quality OLED arrays on flexible PET substrate were obtained with a turn-on voltage of around 5 V, a luminous efficiency of 3 cd/A, a power efficiency of 1.2 lm/W, and a luminance of 800 cd/m2 operated at 7 V on the basis of the actual light emitting area.

Original languageEnglish
Pages (from-to)8915-8919
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number11
Publication statusPublished - 2006 Nov 15

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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