Organic electroluminescent devices with enhanced light extraction
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United States of America Patent
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Aug 17, 2004
Grant Date -
Oct 25, 2001
app pub date -
Dec 22, 2000
filing date -
Mar 31, 2000
priority date (Note) -
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Abstract
An organic light emitting diode containing a first electrode, a second electrode, at least one organic light emitting layer, and an output coupler which reduces a Fresnel loss is provided. The index of refraction of the output coupler is matched to that of the adjacent layer of the device. The output coupler may be a dimpled transparent material or a composite layer containing light scattering particles to also reduce a critical angle loss.
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