Patent ID: 7026651

Claim:
A light emitting device causing emission output of a light having a pseudo-continuous spectrum which is modeled upon is a continuous spectrum obtained from a heat-radiation light source obtained by synthesizing a plurality of emissions differing in peak wavelength so as to ensure an effective wavelength region showing an emission intensity of 5% or more of a reference intensity over a wavelength region of 50 nm or more, the reference intensity being defined as an emission intensity at a peak wavelength in the synthesized spectrum, having a double hetero light emitting layer portion composed of compound semiconductors, the double hetero light emitting layer portion having an active layer comprising a plurality of emission unit layers differing from each other in band gap energy, and the emission output of the light having a pseudo-continuous spectrum is ascribable to a combination of light emission from the individual emission unit layers, wherein the emission unit layers comprise well layers each of which is sandwiched by two barrier layers, and wherein well-depth of well layers in the emission unit layer is a shallower depth in a well having a shorter emission wavelength.