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Organic light-emitting diodes (OLEDs) have receiving great spot light due to their potential applications in full color displays, flexible devices, and solid-state lighting.Various OLEDs with internal quantum efficiency of nearly 100％ had been demonstrated since development of phosphorescent materials.However, the majority of the generated light is confined in the organic and substrate layers due to total internal reflection and only 20％ of the light can be out-coupled.