Patent ID: 8106579

Claim:
A semiconductor light emitting device comprising: a semiconductor light emitting element; a first phosphor which absorbs light emitted from the semiconductor light emitting element and emits first wavelength-converted light, the first phosphor having a first excitation spectrum where excitation intensity is flat or decrease with increasing wavelength around a peak wavelength of the semiconductor light emitting element; a second phosphor which absorbs light emitted from the semiconductor light emitting element and emits second wavelength-converted light, the second phosphor having a second excitation spectrum where excitation intensity increase with respect to increasing wavelength around the peak wavelength; a third phosphor which absorbs light emitted from the semiconductor light emitting element and emits third wavelength-converted light, the third phosphor having a fourth excitation spectrum where excitation intensity is flat or decreases with increasing wavelength around the peak wavelength; and a fourth phosphor which absorbs light emitted from the semiconductor light emitting element and emits fourth wavelength-converted light, the fourth phosphor having a fifth excitation spectrum where excitation intensity increases with respect to increasing wavelength around the peak wavelength, wherein the first excitation spectrum is different from the fourth excitation spectrum, the second excitation spectrum is different from the fifth excitation spectrum, excitation intensity resulting from mixing the first phosphor and the second phosphor has a sixth excitation spectrum region which is flat or increases with respect to increasing wavelength, excitation intensity resulting from mixing the third phosphor and the fourth phosphor has a seventh excitation spectrum region which is flat or increases with respect to increasing wavelength, the sixth excitation spectrum is different from the seventh excitation spectrum, and an upper limit of the peak wavelength falls within both sixth and seventh excitation spectrum regions.