Improved external coupling efficiency in organic light-emitting devices on high-index substrates

M. H. Lu, C. F. Madigan, J. C. Sturm

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


High-index-of-refraction substrates are shown theoretically and experimentally to increase the external coupling efficiency of organic light-emitting devices (OLEDs) by using a quantum mechanical microcavity model. This increase is due to the elimination of those modes waveguided in the ITO/organic layer. Bi-layer OLEDs were fabricated on standard soda lime glass and high-index glass substrates, and their far-field intensity pattern was measured. Among the devices optimized for external efficiency, those on shaped high-index substrates exhibited a 53% improvement in external quantum efficiency over the devices on shaped standard glass substrates, and an increase by a factor of 2-3 times over those on planar glass substrates. This principle is applicable to any backside patterning technique in conjunction with other OLED structural improvements.

Original languageEnglish (US)
Pages (from-to)607-610
Number of pages4
JournalTechnical Digest - International Electron Devices Meeting
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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