In situ measurement of the internal luminescence quantum efficiency in organic light-emitting diodes

Michael Flämmich, Malte Christian Gather, Norbert Danzg, Dirk Michaelis, Klaus Meerholz

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The internal luminescencequantum efficiencyqq is one limiting factor for the performance of organic light-emitting diodes.Photoluminescencemeasurements are frequently used to estimate qq but these neglect effects of the local environment of the emissive sites and the electrical excitation mechanism. We present a method for the in situmeasurement of qq under electrical operation. The current efficiency of several devices with different emitter-cathode distances is quantitatively compared. Precise optical simulation allows determining qq without additional assumptions.
Original languageEnglish
Pages (from-to)263306
Number of pages3
JournalApplied Physics Letters
Volume95
Issue number26
DOIs
Publication statusPublished - 29 Dec 2009

Keywords

  • Organic light emitting diodes
  • Laser efficiency
  • CATHODES
  • LUMINESCENCE
  • Quantum measurement theory

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