Sequential printing by laser-induced forward transfer to fabricate a polymer light-emitting diode pixel

James R.H. Shaw-Stewart, Thomas K. Lippert, Matthias Nagel, Frank A. Nüesch, Alexander Wokaun

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Patterned deposition of polymer light-emitting diode (PLED) pixels is a challenge for electronic display applications. PLEDs have additional problems requiring solvent orthogonality of different materials in adjacent layers. We present the fabrication of a PLED pixel by the sequential deposition of two different layers with laser-induced forward transfer (LIFT), a "dry" deposition technique. This novel use of LIFT has been compared to "normal" LIFT, where all the layers are transferred in a single step, and a conventional PLED fabrication process. For the sequential LIFT, a 50-nm film of an alcohol-soluble polyfluorene (PFN) is transferred onto a receiver with a transparent anode, before an aluminum cathode is transferred on top. Both steps use a triazene polymer dynamic release layer and are performed in a medium vacuum (1 mbar) across a 15 μm gap. The rough morphologies of the single-layer PFN pixels and the PLED device characteristics have been investigated and compared to both bilayer Al/PFN pixels fabricated by normal LIFT and conventionally fabricated devices. The functionality of the sequential LIFT pixels (0.003 cd/A, up to 200 mA/cm 2, at 30-40 V) demonstrates the suitability of LIFT for sequential patterned printing of different thin-film layers.

Original languageEnglish
Pages (from-to)3535-3541
Number of pages7
JournalACS Applied Materials and Interfaces
Volume4
Issue number7
Early online date27 Jun 2012
DOIs
Publication statusPublished - 25 Jul 2012
Externally publishedYes

Keywords

  • laser direct-write
  • LIFT
  • OLEDs
  • patterned deposition
  • PLED pixels
  • sequential laser deposition
  • thin-films
  • triazene polymer

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Sequential printing by laser-induced forward transfer to fabricate a polymer light-emitting diode pixel'. Together they form a unique fingerprint.

  • Cite this