Abstract
Improved outcoupling of light into substrate modes of an organic LED (OLED) by an ultra-low index of refraction , porous grid (UltraLIG) fabricated using glancing-angle deposition is demonstrated. Outcoupling into the substrate for electrophosphorescent tris(2-phenylpyridine) iridium -based OLEDs grown on substrates with the UltraLIG is increased by 48% over a conventional device at a luminance of . With efficient light outcoupling at the substrate–air interface, the UltraLIG devices attain and at their peak efficiencies, a nearly threefold increase over an analogous conventional OLED.
© 2010 Optical Society of America
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