Enhancing the emission directionality of organic light-emitting diodes by using photonic microstructures

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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.
Original languageEnglish
Article number213302
Number of pages5
JournalApplied Physics Letters
Volume103
Early online date18 Nov 2013
DOIs
Publication statusPublished - 21 Nov 2013

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