Patent ID: 7220996

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; a second electrode which is disposed on the further surface of the semiconductor substrate of the second conductivity type; and a semiconductor layer selectively formed in a region of at least one of the semiconductor substrate of the first conductivity type and the semiconductor substrate of the second conductivity type, an impurity being introduced into the semiconductor layer so that a current is caused to flow in concentrated manner through a middle part of the principal surfaces of the light-emitting layer forming portion via the first electrode and the second electrode.