Morphological, electrical and optical properties of organic light-emitting diodes with a LiF/Al cathode and an Al-hydroxyquinoline/diamine junction

R.M. Montereali, S. Gambino, S. Loreti, S. Gagliardi, A. Pace, G. Baldacchini, F. Michelotti

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Abstract

We report the results of the morphological, electrical and optical characterisation of double-layer Alq3-based organic emitting diodes with a lithium fluoride (LiF)/Al cathode. A detailed electron microscopy investigation of their cross-section shows the presence of LiF isolated grains underneath the Al film. Due to the introduction of the LiF layer, luminance was larger than 30,000cd/m2at a bias voltage VB=25V with a maximum external luminous efficiency as large as 46lm/W at VB=20V. Performing on/off VBcycles at a very low frequency, each time a recovery of the initial electric and luminous performance was observed. The non-exponential decay of both electric current and luminance during each on-cycle has been interpreted as the signature of dispersive transport controlled by multiple trapping on localised states in an amorphous system. © 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)171 - 174
Number of pages4
JournalSynthetic Metals
Volume143
Issue number2
DOIs
Publication statusPublished - 3 Jun 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

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