Light emitting device

• Main Authors: CHOI, RAK-JUN, OH, JEONG-TAK, HAN, YOUNG-HUN
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2014
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

Disclosed are a light emitting device, a light emitting device package and a lighting system. The light emitting device includes a first conductive semiconductor layer; a second conductive semiconductor layer on the first conductive semiconductor layer; and an active layer between the first and second conductive semiconductor layers, the active layer including a plurality of well layers and a plurality of barrier layers, wherein the well layers include a first well layer and a second well layer adjacent to the first well layer, the barrier layers include a first barrier layer disposed between the first and second well layers, the first barrier layer includes a plurality of semiconductor layers having an energy bandgap wider than an energy bandgap of the first well layer, and at least two layers of the plurality of semiconductor layers which is adjacent to the first and second well layers have aluminum contents greater than that of the other layer.