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

Journal Article · Mon Nov 18 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4829759· OSTI ID:22254005

Zhang, Shuyu; Samuel, Ifor D. W., ^[1]

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1. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS (United Kingdom)

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.

• OSTI ID: 22254005
• Journal Information: Applied Physics Letters, Vol. 103, Issue 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
APPROXIMATIONS
EMISSION
LIGHT EMITTING DIODES
MICROSTRUCTURE
MOLDING
POLARIZATION
VISIBLE RADIATION