Patent ID: 7808007

Claim:
An optical semiconductor device comprising: a container having a depression to reflect light, the depression having an opening, a bottom and a side surface; a semiconductor light-emitting element placed in the depression to emit light; a first fluorescent material layer located in the depression, at least a portion of the first fluorescent material layer being provided between the opening of the depression and the semiconductor light-emitting element, and the first fluorescent material layer being excited by the light emitted from the semiconductor light-emitting element to emit light having a first wavelength longer than an light-emission wavelength of the semiconductor light-emitting element; and a second fluorescent material layer having first and second portions, the first portion being provided between the bottom of the depression and the semiconductor light-emitting element and located in the depression, the second portion provided between the side surface of the depression and the semiconductor light-emitting element and located in the depression, the second fluorescent material layer being excited by the light emitted from the semiconductor light-emitting element to emit light having a second wavelength longer than the first wavelength.