A nitride-based light emitting device capable of achieving an enhancement in emission efficiency and an enhancement in reliability is disclosed. The light emitting device includes a semiconductor layer, and a light extracting layer arranged on the semiconductor layer and made of a material having a refractive...http://www.google.com.tw/patents/US7939840?utm_source=gb-gplus-share專利 US7939840 - Light emitting device having light extraction structure and method for manufacturing the same
