An apparatus such as a light source is disclosed which has an OLED device and a refractive layer disposed on the substrate or transparent electrode of said OLED device and on the exterior of said OLED device. The refractive layer contains features which have an inner region with a refractive index less than the refractive index of the non-feature regions of the refractive layer.
 This invention was made with Government support under Contract No. DE-FC26-04NT41947 awarded by the Department of Energy. The Government may have certain rights in the invention.