| 摘要 |
Disclosed are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a conductive support member; a reflective layer on the conductive support member; a light emitting structure on the reflective layer including a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer between the first and second semiconductor layers; and an electrode on the first conductive semiconductor layer, wherein a distance between the active layer and the reflective layer satisfies 2 €¢ ¦1+¦3 = N €¢ 2 ±”, (0‰¤”‰¤ /2) in which the ¦1 represents a phase change value when light vertically traveling passes through the second conductive semiconductor layer, the ¦3 represents a phase change value when the light is reflected by the reflective layer, and the N represents a natural number, and wherein the distance between the reflective layer and the active layer includes a first distance in a first region overlapping with the electrode perpendicularly to the electrode and a second distance in a second region other than the first region, the first distance being different from the second distance. |
