Light extraction sheet, organic electroluminescence element and illumination device
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United States of America Patent
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Jan 10, 2017
Grant Date -
Mar 14, 2013
app pub date -
May 17, 2011
filing date -
May 26, 2010
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Abstract
Disclosed is a novel light extraction sheet, which not only improves light extraction efficiency but suppresses color change with the angle of observation, an organic EL element employing this light extraction sheet, and an illumination device employing the element. The light extraction sheet is featured in that it comprises a transparent resin film and provided thereon, a light scatter layer containing a binder resin and light scattering particles with an average particle size of front 0.2 to 1.0 μm dispersed in the binder resin and a concavo-convex layer containing a binder resin and spherical particles with an average particle size of from 3 to 10 μm.
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