Tunable microcavities in organic light-emitting diodes by way of low-refractive-index polymer doping

An Kai Ling, Chun Hao Lin, Hsun Liang, Fang-Chung Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A method for enhancing the light out-coupling efficiency of organic light-emitting devices (OLEDs) has been demonstrated by blending a low-refractive-index polymer, poly(2,2,3,3,3-pentafluoropropyl methacrylate) (PPFPMA), into the emission layer. The resonant wavelength of the weak microcavity devices blueshifted accompanied with a decrease in refractive indices of the light-emitting layers after the addition of PPFPMA. Stronger directed emission toward the surface normal was obtained when the resonant wavelength became closer to the peak wavelength of intrinsic emission spectrum of the organic emitters. The luminous efficiency of the devices was enhanced by more than 20%. The results suggest that the microcavity properties of the OLEDs can be tunable through blending low-refractive-index materials.

Original languageEnglish
Pages (from-to)3648-3653
Number of pages6
JournalOrganic Electronics
Volume15
Issue number12
DOIs
StatePublished - 1 Dec 2014

Keywords

  • Light-emitting
  • Microcavity
  • Organic
  • Refractive index
  • Resonant

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