Full spectrum white light emitting devices
A full spectrum white light emitting device includes photoluminescence materials which generate light with a peak emission wavelength in a range from about 490 nm to about 680 nm; and a broadband solid-state excitation source operable to generate broadband excitation light with a dominant wavelength in a range from about 420 nm to about 480 nm. The device is operable to generate white light with a Correlated Color Temperature in a range from about 1800K to about 6800K, a CRI R9 less than 90, a spectrum whose intensity decreases from its maximum value in the orange to red region of the spectrum to about 50% of the maximum value at a wavelength in a range from about 645 nm to about 695 nm, and over a wavelength range from about 430 nm to about 520 nm, a maximum percentage intensity deviation of light emitted by the device is less than 60% from the intensity of light of at least one of a black-body curve and CIE Standard Illuminant D of the same Correlated Color Temperature.
1. A full spectrum white light emitting device comprising:
photoluminescence materials which generate light with a peak emission wavelength from 490 nm to 680 nm; and
a broadband solid-state excitation source that generates broadband excitation light with a dominant wavelength from 420 nm to 480 nm and a FWHM of at least 30 nm,
wherein the device generates white light having an intensity that decreases from a maximum value in the orange to red region of the spectrum to 50% of said maximum value at a wavelength from 625 nm to 695 nm.
2. The light emitting device of claim 1 , wherein said white light has an intensity that decreases to 50% of said maximum value at a wavelength from 625 nm to 665 nm.
3. The light emitting device of claim 1 , wherein said white light has an intensity that decreases to 50% of said maximum value at a wavelength from 645 nm to 665 nm.
4. The light emitting device of claim 1 , wherein said white light has a CRI Ra of at least 80.
5. The light emitting device of claim 1 , wherein said white light has a CRI Ra of at least 90.
6. The light emitting device of claim 1 , wherein said white light has a CRI Ra of at least 95.
7. The light emitting device of claim 1 , wherein over a wavelength range from 430 nm to 530 nm, a maximum percentage intensity deviation of said white from the intensity of light of a black-body curve or CIE Standard Illuminant D of the same color temperature is less than 60%.
8. The light emitting device of claim 7 , wherein said maximum percentage intensity deviation of light emitted by the device is less than at least one of 50%, 40%, 30%, 20% and 10%.
9. The light emitting device of claim 1 , wherein said white light has a CAF that is within 5% a black-body curve or CIE Standard Illuminant D of the same color temperature.
10. The light emitting device of claim 1 , wherein the photoluminescence materials comprise at least one or a combination of photoluminescence materials which generates light with a peak emission wavelength from 600 nm to 660 nm.
11. The light emitting device of claim 1 , wherein said white light has a Correlated Color Temperature from 2700K to 3000K and the device has a lumen efficacy of at least 102 lm/W.
12. The light emitting device of claim 1 , wherein said white light has a Correlated Color Temperature from 4000K to 6800K and the device has a lumen efficacy of at least 110 lm/W.
13. The light emitting device of claim 1 , wherein the broadband excitation light is composed of multiple narrowband blue light emissions having different wavelengths.
14. The light emitting device of claim 13 , wherein the broadband solid-state excitation source comprises multiple narrowband solid-state light sources.
15. The light emitting device of claim 12 , wherein the broadband blue solid-state excitation source comprises a solid-state light source having multiple different quantum wells.