Patent ID: 8779425
Filing Date: 2014-07-15
Classification: H01L

Abstract:
1. A light emitting device, comprising: a first conductive type semiconductor layer; a second conductive type semiconductor layer; an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer, wherein the active layer comprises a first active layer and a second active layer adjacent to the first active layer; and a gate quantum barrier between the first active layer and the second active layer, wherein a quantum-mechanically quantized density of state of the second active layer is greater than that of the first active layer, and wherein, when a first level of current is applied, the gate quantum barrier confines a hole, which is injected into the first active layer through the second conductive type semiconductor layer, preventing transport to the second active layer, and when a second level of current that is higher than the first level of current is applied, the gate quantum barrier allows the hole, which is injected into the first active layer through the second conductive type semiconductor layer, to be drift-transported to the second active layer.