Patent ID: 8754429

Claim:
An optical semiconductor device, comprising: a light emitting layer including a first major surface, a second major surface, a first electrode, and a second electrode, the second major surface being a surface opposite to the first major surface, the first electrode and the second electrode being formed on the second major surface, the light emitting layer being configured to emit a first light; a transparent layer provided on the first major surface, the transparent layer being transparent with respect to the first light; a fluorescent layer provided on the transparent layer, the fluorescent layer being configured to absorb a part of the first light and to emit a second light having a wavelength different from a wavelength of the first light; a first metal post provided on the first electrode; a second metal post provided on the second electrode; and a sealing layer provided on the second major surface, the sealing layer being configured to cover at least a part of a side surface of the light emitting layer and to seal a side face of the first metal post and a side face of the second metal post, the sealing layer being light-shielding with respect to the first light, at least a part of a side face of the transparent layer being not covered by the fluorescent layer and not covered by the sealing layer.