Pulsed laser deposition of small molecules for organic electroluminescence

S. R. Farrar, A. E.A. Contoret, M. O'Neill, J. E. Nicholls, A. J. Eastwood, G. J. Richards, P. Vlachos, S. M. Kelly

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

A XeCl excimer laser at 308 nm is used for the pulsed laser deposition (PLD) of a range of novel electroluminescent molecules. An optimum fluence dependent on the absorption length is found as a compromise between deposition rate and photodecomposition. There is minimal degradation of the aromatic luminescent core of the molecule when the fluence is optimised. Electroluminescent devices are prepared and show similar properties to those incorporating spin-cast films. Photodecomposition is observed for films deposited using higher fluences. The decomposition mechanism is ablative and some photoproducts are oxidised at high fluences. Thin films of reactive mesogens, containing end-groups which can undergo free radical polymerisation, are also prepared by PLD. These are not polymerised on the substrate by the deposition process. Subsequent irradiation with ultraviolet light results in an insoluble cross-linked network.

Original languageEnglish
Pages (from-to)435-440
Number of pages6
JournalApplied Surface Science
Volume186
Issue number1-4
DOIs
Publication statusPublished - 2002 Jan 28
Externally publishedYes
EventProceedings of the European Materials Research Society 2001 Symposium - Strasbourg, France
Duration: 2001 Jun 52001 Jun 5

Keywords

  • Electroluminescence
  • Laser ablation
  • Liquid crystal
  • Organic
  • Pulsed laser deposition
  • Reactive mesogen

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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