Device reflectivity as a simple rule for predicting the suitability of scattering foils for improved OLED light extraction

Jack W. Levell, Stephan Harkema, Raghu K. Pendyala, Peter A. Rensing, Alessia Senes, Dirk Bollen, Duncan MacKerron, Joanne S. Wilson

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

A general challenge in Organic Light Emitting Diodes (OLEDs) is to extract the light efficiently from waveguided modes within the device structure. This can be accomplished by applying an additional scattering layer to the substrate which results in outcoupling increases between 0% to <100% in external quantum efficiency. In this work, we aim to address this large variation and show that the reflectivity of the OLED is a simple and useful predictor of the efficiency of substrate scattering techniques without the need for detailed modeling. We show that by optimizing the cathode and anode structure of glass based OLEDs by using silver and an ITO free high conductive Agfa Orgacon™ PEDOT:PSS we are able to increase the external quantum efficiency of OLEDs with the same outcoupling substrates from 2.4% to 5.6%, an increase of 130%. In addition, Holst Centre and partners are developing flexible substrates with integrated light extraction features and roll to roll compatible processing techniques to enable this next step in OLED development both for lighting and display applications. These devices show promise as they are shatterproof substrates and facilitate low cost manufacture.

Original languageEnglish
Article number88291L
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume8829
DOIs
Publication statusPublished - 13 Sep 2013
EventOrganic Light Emitting Materials and Devices XVII - San Diego, CA, United States
Duration: 25 Aug 201328 Aug 2013

Keywords

  • Flexible
  • Large Area
  • Light Extraction
  • OLED
  • Reflectivity
  • Solution Processed

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