Enhancing the efficiency of alternating current driven organic light-emitting devices by optimizing the operation frequency

Markus Froebel*, Ajay Perumal, Tobias Schwab, Malte C. Gather, Bjoern Luessem, Karl Leo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report efficient and bright organic light-emitting devices operated by capacitive energy coupling. In this approach, the organic layers are enclosed between sputter-deposited hafnium dioxide layers to prevent charge carrier injection. When a sinusoidal voltage signal is applied to the electrodes, the devices emit bright green light whereas no detectable emission is generated upon application of a constant voltage. The efficiency of the process depends heavily on the frequency of the applied voltage signal. By optimizing the driving scheme, a record luminous efficacy for AC driven OLEDs of 2.7 lm/W at 500 cd/m(2) is achieved. (c) 2013 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)809-813
Number of pages5
JournalOrganic Electronics
Volume14
Issue number3
DOIs
Publication statusPublished - Mar 2013

Keywords

  • Alternating current
  • Organic light-emitting device
  • Hafnium dioxide
  • IMPACT EXCITATION
  • ELECTROLUMINESCENCE
  • ZNS
  • LUMINESCENCE
  • EMISSION
  • FILMS
  • LEDS

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