Far-field and hole injection enhancement by noble metal nanoparticles in organic light emitting devices

P. Justin Jesuraj, K. Jeganathan, M. Navaneethan, Y. Hayakawa

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We report the combined effect of plasmonic far-field and improved hole injection towards enhancing the performance of OLEDs by the incorporation of gold and silver (Au and Ag) nanoparticles at the interface of anode/hole transport layer (HTL). The metal nanoparticles incorporated devices facilitate improved hole injection into HTL owing to the shift in vacuum level of anode resulting in three fold enhancement of current density in OLEDs. Hole only devices made with Au and Ag nanoparticles at anodes offer meliorated hole injection than the reference anode due to the reduced injection barrier. X-ray photoelectron spectroscopy analysis further corroborates the alteration of work function of metal nanoparticles infused ITO by exhibiting an abrupt shift in In 3d and Sn 3d photoelectron energy levels. In addition, time resolved photoluminescence spectra reveal that the interaction of far-field plasmons with the device emission accelerates the luminescence of OLEDs further.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalSynthetic Metals
Volume211
DOIs
StatePublished - Jan 2016

Keywords

  • Enhanced brightness
  • Far-field plasmons
  • Gold nanoparticles
  • Hole injection
  • OLEDs
  • Silver nanoparticles

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