Patent ID: 9705030
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A semiconductor-based ultraviolet light emitting diode structure without an Mg-doped electron blocking layer comprising: a light emitting active region comprising at least one quantum well layer sandwiched between quantum barrier layers; a p-doped AlGaN superlattice; one or more additional p-doped layers; an AlN or AlGaN injection layer with high aluminum mole fraction between the light emitting active region and the p-doped layer, wherein said AlN or AlGaN injection layer has higher aluminum mole fraction than said quantum barrier layers and a bandgap energy larger than that of said quantum barrier layers, wherein said AlN or AlGaN injection layer has higher aluminum mole fraction than aluminum mole fraction in each of said one or more additional p-doped layers and an average aluminum mole fraction of said p-doped AlGaN superlattice, and wherein said AlN or AlGaN injection layer has Al concentration of more than 60%; wherein said injection layer has a thickness such that holes can tunnel from the p-side of the semiconductor-based ultraviolet light emitting diode structure through the injection layer in the active zone and also reducing leakage electrons out of the active zone, wherein said semiconductor-based ultraviolet light emitting diode structure does not have an Mg-doped electron blocking layer.