Full spectrum white light emitting devices
A full spectrum light emitting device includes photoluminescence materials which generate light with a peak emission wavelength in a range 490 nm to 680 nm (green to red) and a broadband solid-state excitation source operable to generate broadband blue excitation light with a dominant wavelength in a range from 420 nm to 470 nm, where the broadband blue excitation light includes at least two different blue light emissions in a wavelength range 420 nm to 480 nm.
1. A full spectrum white light emitting device comprising:
a first photoluminescence material which generates light with a peak emission wavelength in a range 490 nm to 550 nm, and a second photoluminescence material which generates light with a peak emission wavelength in a range 600 nm to 680 nm; and
a broadband solid-state excitation source operable to generate excitation light with a dominant wavelength in a range from 420 nm to 480 nm and a FWHM greater than or equal to 30 nm.
2. The full spectrum white light emitting device of claim 1 , wherein the excitation light has a FWHM in a range selected from the group consisting of: from 30 nm to 50 nm, from 35 nm to 50 nm, from 40 nm to 50 nm, and 45 nm to 50 nm.
3. The full spectrum white light emitting device of claim 1 , characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 90.
4. The full spectrum white light emitting device of claim 3 , characterized by generating white light with a CRI Ra of greater than or equal to 95.
5. The full spectrum white light emitting device of claim 1 , characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 95.
6. The full spectrum white light emitting device of claim 1 , characterized by generating white light with a CRI R12 of greater than or equal to 90.
7. The full spectrum white light emitting device of claim 1 , wherein the light emitting device is operable to generate white light with a color temperature in a range from about 2500 K to about 6500K.
8. The full spectrum white light emitting device of claim 1 , characterized by generating white light with a IEC TM-30 fidelity index R f of greater than or equal to 96.
9. The full spectrum white light emitting device of claim 1 , wherein the excitation light comprises at least two different wavelength blue light emissions.
10. The full spectrum white light emitting device of claim 9 , wherein the solid-state excitation source comprises:
a first LED operable to generate a blue light emission with a first dominant wavelength in a range 420 nm to 480 nm; and
a second LED operable to generate a different blue light emission with a second dominant wavelength in a range 420 nm to 480 nm.
11. The full spectrum white light emitting device of claim 9 , wherein the blue solid-state excitation source comprises an LED having an active region with at least two different quantum wells that each generate a respective one of the at least two different wavelength blue light emissions.
12. A full spectrum white light emitting device comprising:
photoluminescence materials which generate light with a peak emission wavelength in a range 490 nm to 680 nm and
a broadband blue solid-state excitation source operable to generate broadband blue excitation light with a dominant wavelength in a range from 420 nm to 480 nm,
wherein the broadband blue excitation light comprises at least two different wavelength blue light emissions in a range 420 nm to 480 nm.
13. The light emitting device of claim 12 , wherein the broadband blue solid-state excitation source generates broadband blue excitation light with a FWHM selected from the group consisting of: at least 30 nm, from 30 nm to 50 nm, from 35 nm to 50 nm, from 40 nm to 50 nm, and 45 nm to 50 nm.
14. The light emitting device of claim 12 , wherein the broadband blue solid-state excitation source comprises:
a first LED for generating a blue light emission with a first dominant wavelength in a range 420 nm to 480 nm and
a second LED for generating a different wavelength blue light emission with a second dominant wavelength in a range 420 nm to 480 nm.
15. The light emitting device of claim 14 , wherein the first dominant wavelength is in a range from 420 nm to 450 nm; and the second dominant wavelength is in a range from 450 nm to 480 nm.
16. The light emitting device of claim 14 , further comprising a third LED for generating a blue light emission with a third dominant wavelength in a range 420 nm to 480 nm which is different from the first and second dominant wavelengths.
17. The light emitting device of claim 16 , wherein the first LED has a dominant wavelength of about 441 nm; the second LED has a dominant wavelength of about 451 nm; and the third LED with a dominant wavelength of about 468 nm.
18. The light emitting device of claim 12 , characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 90.
19. The light emitting device of claim 12 , characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 95.
20. The light emitting device of claim 18 or claim 19 , characterized by generating white light with a CRI Ra of greater than or equal to 95.
21. The light emitting device of claim 12 , characterized by generating white light with a CRI Ra of greater than or equal to 80.
22. The light emitting device of claim 12 , characterized by generating white light with a CRI R12 of greater than or equal to 90.
23. The light emitting device of claim 12 , wherein the light emitting device is operable to generate white light with a color temperature in a range selected from the group consisting of: from about 2500 K to about 6500K; from about 2500 K to about 3000K; and from about 4000 K to about 6500K.
24. The light emitting device of claim 12 , characterized by generating white light with a IEC TM-30 fidelity index R f of greater than or equal to 96.
25. The light emitting device of claim 12 , wherein there is a difference in wavelength between the at least two blue light emissions of at least 5 nm, or a difference in wavelength between the at least two blue light emissions of at least 10 nm.
26. The light emitting device of claim 12 , wherein the broadband blue solid-state excitation source comprises an LED having an active region with at least two different quantum wells that each generate a respective one of the at least two different wavelength blue light emissions.
27. The light emitting device of claim 12 , wherein the green to yellow photoluminescence material and red photoluminescence material are located remotely to the broadband blue solid-state excitation source.
28. A white light emitting device comprising: a first photoluminescence material which generates light with a peak emission wavelength in a range 490 nm to 550 nm, and a second photoluminescence material which generates light with a peak emission wavelength in a range 600 nm to 680 nm; and a broadband solid-state excitation source operable to generate excitation light with a dominant wavelength in a range from 420 nm to 480 nm and a FWHM greater than or equal to 30 nm, characterized by generating white light with a CRI Ra of greater than or equal to 80.