Patent ID: 6229834
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A light emitting diode for emitting spontaneous radiation and having a double heterostructure, comprising:(a) an active layer for emitting the spontaneous radiation having a given wavelength;b) a first clad layer of a first conductivity type formed on the active layer;c) a second clad layer, separate from the other structures, of the first conductivity type formed on the first clad layer of the first conductivity type;d) a semiconductor layer uniformly formed on a whole surface of the second clad layer of the first conductivity type;e) an upper metal electrode formed over a part of the semiconductor layer so as to define an optical aperture for emitting upward the spontaneous radiation from said active layer through said first and second clad layer of the first conductivity type and the semiconductor layer;f) a first clad layer of a second conductivity type formed under the active layer;g) a second clad layer separate from other structures of the second conductivity type formed under the first clad layer of the second conductivity type; andh) a substrate formed under the second clad layer of the second conductivity type,a forbidden band gap of the first clad layer of the first conductivity type being smaller than that of the second clad layer of the first conductivity type, and the forbidden band gap of the first clad layer of the second conductivity type being smaller than that of the second clad layer of the second conductivity type.