Enhancing the emission directionality of organic light-emitting diodes by using photonic microstructures
Abstract
We report microstructured organic light-emitting diodes (OLEDs) with directional emission based on efficient solution-processable europium-OLEDs patterned by solvent assisted microcontact molding. The angle dependence of the light emission is characterized for OLEDs with square-array photonic crystals with periods between 275 nm and 335 nm. The microstructured devices have emission patterns strongly modified from the Lambertian emission of planar OLEDs and can approximately double the emitted power in a desired angle range in both s- and p-polarizations. The modified emission is attributed to light diffracted out of the waveguide modes of the OLEDs.
Citation
Zhang , S , Turnbull , G A & Samuel , I D W 2013 , ' Enhancing the emission directionality of organic light-emitting diodes by using photonic microstructures ' , Applied Physics Letters , vol. 103 , 213302 . https://doi.org/10.1063/1.4829759
Publication
Applied Physics Letters
Status
Peer reviewed
ISSN
0003-6951Type
Journal article
Rights
© 2013. AIP Publishing LLC. This article was published in Applied Physics Letters on 18 November 2013, available online: http://scitation.aip.org/content/aip/journal/apl/103/21/10.1063/1.4829759
Description
S. Zhang, G. A. Turnbull, and I. D. W. Samuel are grateful to the Scottish Universities Physics Alliance (SUPA) and the Engineering and Physical Sciences Research Council (EPSRC) for financial support.Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.