Patent ID: 7476902

Claim:
A semiconductor light-emitting device comprising: a light-emitting layer forming portion which has a pn-junction permitting light emission at a specific wavelength and has two principal surfaces opposite each other; a semiconductor substrate of a first conductivity type which is integrally joined to one principal surface of the light-emitting layer forming portion and is substantially transparent to the wavelength, the semiconductor substrate of the first conductivity type having a joined surface on the one principal surface of the light-emitting layer forming portion, an outer side surface which is inclined so that the width is large on a side near the light-emitting layer forming portion and becomes narrow on a side away from the light-emitting layer forming portion and a further surface opposite the joined surface of the semiconductor substrate of the first conductivity type; a first electrode which is disposed on the further surface of the semiconductor substrate of the first conductivity type; a semiconductor substrate of a second conductivity type which is integrally joined to the other principal surface of the light-emitting layer forming portion and is substantially transparent to the wavelength, the second conductivity being reverse to the first conductivity, the semiconductor substrate of the second conductivity type having a joined surface on the other principal surface of the light-emitting layer forming portion, an outer side surface which is inclined so that the width is large on a side near the light-emitting layer forming portion and becomes narrow on a side away from the light-emitting layer forming portion and a further surface opposite the joined surface of the semiconductor substrate of the second conductivity type; and a second electrode which is disposed on the further surface of the semiconductor substrate of the second conductivity type; at least one of the semiconductor substrate of the first conductivity type and the semiconductor substrate of the second conductivity type having an interstice located near the outer side surface on a side close to the light-emitting layer forming portion and around the joined surface on the principal surface of the light-emitting layer forming portion.