LIGHT EMITTING DEVICE AND LIGHTING SYSTEM INCLUDING THE SAME

摘要

PURPOSE: A light emitting device and a lighting system including the same are provided to optimize an optical guide and to increase the extraction efficiency. CONSTITUTION: A first nitride semiconductor layer (120A) has a first refractive index. The refractive index of an active layer (114) is higher than the first refractive index. A second nitride semiconductor layer (120B) is formed on the active layer. The second refractive index of the second nitride semiconductor layer is smaller than the refractive index of the active layer. A second conductive semiconductor layer (116) is formed on the second nitride semiconductor layer.