×

Light emitting device having a pseudo-continuous spectrum and lighting apparatus using the same

  • US 7,026,651 B2
  • Filed: 07/30/2003
  • Issued: 04/11/2006
  • Est. Priority Date: 07/31/2002
  • Status: Expired due to Fees
First Claim
Patent Images

1. 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, andwherein well-depth of well layers in the emission unit layer is a shallower depth in a well having a shorter emission wavelength.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×