Vacuum-free lamination of low work function cathode for efficient solution-processed organic light-emitting diodes

Yu Fan Chang, Chun Yu Chen, Fang Tsai Luo, Yu Chiang Chao, Hsin Fei Meng, Hsiao Wen Zan, Hao Wu Lin, Sheng Fu Horng, Teng Chih Chao, Han Cheng Yeh, Mei Rurng Tseng

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15 Citations (Scopus)

Abstract

The low work function cathode of blade-coated organic light-emitting diode is transferred from a soft polydimethylsiloxane (PDMS) mold by lamination without vacuum. The cathode is a bilayer of polyethylene glycol (PEG) (<10 nm) and Al (100 nm). A sacrificial layer of polystyrene with low Mw 1500 and melting point of 120°C is inserted between the cathode and PDMS for the subsequent mold removal at 150°C by melting polystyrene. Current efficiency of 3 cd/A (1.1%) and luminance of 2500 cd/m2 are achieved for green polyfluorene fluorescent emitter. 25 cd/A (8.2%) and 3200 cd/m2 are achieved for green phosphorescent tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)3) emitter in polymer blend host. The efficiency is about 70% of the devices with thermally evaporated cathode. The turn-on voltage is about 5 V higher.

Original languageEnglish
Pages (from-to)388-393
Number of pages6
JournalOrganic Electronics
Volume13
Issue number3
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Lamination
  • Low work function
  • Polyethylene glycol

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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  • Cite this

    Chang, Y. F., Chen, C. Y., Luo, F. T., Chao, Y. C., Meng, H. F., Zan, H. W., Lin, H. W., Horng, S. F., Chao, T. C., Yeh, H. C., & Tseng, M. R. (2012). Vacuum-free lamination of low work function cathode for efficient solution-processed organic light-emitting diodes. Organic Electronics, 13(3), 388-393. https://doi.org/10.1016/j.orgel.2011.11.008