Patent ID: 7473935

Claim:
A white-light emitting semiconductor device, comprising: a first light-emitting die emitting a first radiation having a first wavelength range; a second light-emitting die emitting a second radiation having a second wavelength range, and a third radiation having a third wavelength range shorter than the second wavelength range; a photostimulable luminescent substance excitable to emit a fourth radiation having a fourth wavelength range, the fourth radiation being mixed with the first, second, and third radiations to result in white light; and a holding assembly holding said first and second light-emitting dies, and said photostimulable luminescent substance, wherein said second light-emitting die includes a first light-emitting layer emitting the second radiation, a second light-emitting layer emitting the third radiation, a p-type cladding layer, and an n-type cladding layer, said first and second light-emitting layers being disposed between said p-type and n-type cladding layers, said second light-emitting layer being proximate to said p-type cladding layer, and including a first barrier film proximate to said p-type cladding layer, a second barrier film, and a carrier confining film between said first and second barrier films and having a plurality of alternating peaks and valleys, said carrier confining film having an energy gap smaller than those of said first and second barrier films, wherein said second light-emitting layer has a valley density ranging from 5% to 75%, the valley density being defined by a ratio of a summation of the widths of said valleys to a total length of said second light-emitting layer along a direction that the widths are measured.