Solid-state grow-lights for plant cultivation
There is provided a light emitting device, for example a grow-light, comprising: a grow-light comprising: a broadband blue solid-state light source that generates broadband blue light with a peak emission wavelength from 420 nm to 495 nm and a full width at half maximum of at least 30 nm. It may be that the broadband blue light substantially matches at least one of: the absorption peak wavelength of chlorophyll-a; the absorption peak wavelength of chlorophyll-b; and the absorption peak wavelength of carotenoid.
1. A grow-light comprising:
a broadband blue solid-state light source that generates broadband blue light with a peak emission wavelength from 420 nm to 495 nm;
wherein the broadband blue solid-state light source comprises a broadband InGaN/GaN multiple quantum wells LED chip comprising multiple different wavelength quantum wells in its active region that generate multiple narrowband blue to cyan light emissions of multiple different wavelengths;
wherein the broadband blue light is composed of a combination of the multiple narrowband blue to cyan light emissions; and wherein the broadband blue light has a greater full width at half maximum as compared to the narrowband blue to cyan light emissions.
2. The grow-light of claim 1 , wherein the broadband blue light substantially matches at least one of:
the absorption peak wavelength of chlorophyll-a;
the absorption peak wavelength of chlorophyll-b; and
the absorption peak wavelength of carotenoid.
3. The grow-light of claim 1 , wherein the peak emission wavelength of the broadband blue light is at least one of:
from 420 nm to 450 nm;
from 460 nm to 480 nm; and
from 450 nm to 465 nm and 480 nm to 495 nm.
4. The grow-light of claim 1 , further comprising a red solid-state light source or red photoluminescence material that generates red light with a peak emission wavelength from 630 nm to 680 nm.
5. The grow-light of claim 4 , wherein the broadband blue light has a blue photon flux, and the red light has a red photon flux, and wherein a ratio of the blue photon flux to the red photon flux is from about 1:3 to about 3:1.
6. The grow-light of claim 4 , wherein the ratio of the blue photon flux to the red photon flux is about 1:1.
7. The grow-light of claim 4 , further comprising a far red solid-state light source or a far red photoluminescence material that generates far red light with a peak emission wavelength from about 630 nm to about 780 nm.
8. The grow-light of claim 1 , further comprising at least one of: a green to yellow photoluminescence material that generates green to yellow light with a peak emission wavelength from about 540 nm to about 600 nm; and cyan to red photoluminescence material that generates cyan to red light with a peak emission wavelength from about 500 nm to about 680 nm.
9. The grow-light of claim 1 , wherein broadband blue solid-state light source generates full spectrum blue light from 400 nm to 520 nm with a spectrum whose emission intensity varies by less than 25% over a wavelength range of at least 40 nm.
10. The grow-light of claim 9 , wherein the emission intensity varies by less than 20%, less than 15%, or less than 10% over a wavelength range of at least 40 nm or less than 10% from 430 nm to 470 nm or from 450 nm to 465 nm.
11. The grow-light of claim 1 , wherein the broadband blue light has a full width at half maximum of at least 30 nm or from about 30 nm to 80 nm.
12. A grow-light comprising:
a broadband blue solid-state light source that generates broadband blue light with a blue photon flux; and
a red solid-state light source that generates red light with a red photon flux;
wherein a ratio of the blue photon flux to red photon flux is from about 1:3 to about 3:1;
wherein the broadband blue solid-state light source comprises a broadband InGaN/GaN multiple quantum wells LED chip comprising multiple different wavelength quantum wells in its active region that generate multiple narrowband blue to cyan light emissions of multiple different wavelengths;
wherein the broadband blue light is composed of a combination of the multiple narrowband blue to cyan light emissions; and wherein the broadband blue light has a greater full width at half maximum as compared to the narrowband blue to cyan light emissions.
13. The grow-light of claim 12 , wherein the ratio of the blue photon flux to the red photon flux is about 1:1.
14. The grow-light of claim 12 , wherein the broadband blue solid-state light source generates broadband blue light with a peak emission wavelength from 420 nm to 495 nm.
15. The grow-light of claim 14 , wherein the broadband blue light substantially matches at least one of:
the absorption peak wavelength of chlorophyll-a;
the absorption peak wavelength of chlorophyll-b; and
the absorption peak wavelength of carotenoid.
16. The grow-light of claim 15 , wherein the peak emission wavelength of the broadband blue light is at least one of:
from 420 nm to 460 nm;
from 460 nm to 480 nm; and
from 450 nm to 465 nm and 480 nm to 495 nm.
17. The grow-light of claim 12 , wherein the broadband blue solid state light source generates a first broadband blue light from 420 nm to 450 nm with a first blue photon flux, and a second broadband blue light from 460 nm to 470 nm with a second blue photon flux, and wherein a ratio of the first blue photon flux to the second blue photon flux is from 2:1 to 4:1.
18. The grow-light of claim 12 , wherein the red solid-state light source comprises a narrowband blue LED and a red photoluminescence material.
19. The grow-light of claim 12 , further comprising a far red solid-state light source or a far red photoluminescence material that generates far red light with a peak emission wavelength from about 680 nm to about 780 nm.
20. The grow-light of claim 12 , wherein the broadband blue light has a full width at half maximum of at least 30 nm or from about 30 nm to 80 nm.