SURFACE EMITTING TYPE LIGHT-EMITTING DIODE

摘要

PURPOSE:To enhance an element lifetime by reducing lattice defects within an active layer in a surface emitting light-emitting diode having a light reflection layer of a multi-layer structure and make it possible to emit the light at comparatively small operation voltage. CONSTITUTION:A composition of an interface portion of each layer of a light reflection layer formed with a multi-layer structure is continuously made to change as shown in a solid line of Fig.2. Since a lattice mismatching within the light reflection layer is mitigated to restrain a generation of crytical defects, the crytical defects within an active layer formed on the light reflection layer are also reduced and a dark line deterioration due to a dislocation growth at operating is restrained to lengthen an element lifetime. Further, since discontinuity of bands within the light reflection layer is mitigated, an electric resistance is lowered, whereby this embodiment can be operated at a small operation voltage.