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

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Scopus citations

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
StatePublished - 1 Jan 2012

Keywords

  • Lamination
  • Low work function
  • Polyethylene glycol

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