White light emitting device

A white light emitting device comprising:

• a first light emitting diode configured to emit first blue light having a peak intensity at a wavelength within the range of 445 nm to 455 nm;
• a second light emitting diode configured to emit second blue light having a peak intensity at a wavelength within the range of 465 nm to 490 nm;
• a first wavelength conversion material configured to convert at least portions of the first blue light and the second blue light to emit first light having a peak intensity at a wavelength within the range of 520 nm to 560 nm;
• and
• a second wavelength conversion material configured to convert at least portions of the first blue light and the second blue light to emit second light having a peak intensity at a wavelength within the range of 600 nm to 645 nm, the second wavelength conversion material having at least one red phosphor selected from among (Sr,Ca)AlSiN3:Eu, CaAlSiN3:Eu, and any combination thereof,
• wherein a combination of an unconverted portion of the first blue light, an unconverted portion of the second blue light, the first light, and the second light produces a white light, and
• wherein, in a spectrum of the white light, peak intensities of the unconverted portion of the first blue light and the unconverted portion of the second blue light range from 50% to 110% and from 53% to 110% of a peak intensity of the second light respectively, the sum of the peak intensities of the unconverted portions of the first blue light and the second blue light ranges from 140% to 180% of the peak intensity of the second light, and the maximum intensity in a wavelength range of 530 nm to 550 nm ranges from 70% to 90% of the peak intensity of the second light.

A white light emitting device comprising:

• a first light emitting diode configured to emit first blue light having a peak intensity at a wavelength within the range of 445 nm to 455 nm;
• a second light emitting diode configured to emit second blue light having a peak intensity at a wavelength within the range of 465 nm to 495 nm;
• a first wavelength conversion material configured to convert at least portions of the first blue light and the second blue light to emit first light having a peak intensity at a wavelength within the range of 520 nm to 560 nm;
• and
• a second wavelength conversion material configured to convert at least portions of the first blue light and the second blue light to emit second light having a peak intensity at a wavelength within the range of 600 nm to 645 nm, the second wavelength conversion material including a KxSiFy:Mn4+ (2≤x≤3, 4≤y≤7) phosphor,
• wherein a combination of an unconverted portion of the first blue light, an unconverted portion of the second blue light, the first light, and the second light produces a white light, and
• wherein, in a spectrum of the white light, peak intensities of the unconverted portion of the first blue light and the unconverted portion of the second blue light range from 20% to 50% of a peak intensity of the second light, the sum of the peak intensities of the unconverted portion of the first blue light and the second blue light ranges from 58% to 67% of the peak intensity of the second light, and intensities of light having wavelengths of 530 nm and 550 nm range from 30% to 40% of the peak intensity of the second light.