Format

Send to:

Choose Destination
See comment in PubMed Commons below
Opt Express. 2012 Nov 5;20 Suppl 6:A932-40. doi: 10.1364/OE.20.00A932.

White organic light emitting diodes with enhanced internal and external outcoupling for ultra-efficient light extraction and Lambertian emission.

Author information

  • 1Light Technology Institute, Karlsruhe Institute of Technology, Kaiserstr 12, D-76131 Karlsruhe, Germany. tobias.bocksrocker@kit.edu

Abstract

White organic light emitting diodes (WOLEDs) suffer from poor outcoupling efficiencies. The use of Bragg-gratings to enhance the outcoupling efficiency is very promising for light extraction in OLEDs, but such periodic structures can lead to angular or spectral dependencies in the devices. Here we present a method which combines highly efficient outcoupling by a TiO(2)-Bragg-grating leading to a 104% efficiency enhancement and an additional high quality microlens diffusor at the substrate/air interface. With the addition of this diffusor, we achieved not only a uniform white emission, but also further increased the already improved device efficiency by another 94% leading to an overall enhancement factor of about 4.

PMID:
23187670
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Write to the Help Desk