Light source for plant cultivation and plant cultivation device

Patent metadata

Field	Value
Publication number	US-12078302-B2
Application number	US-202117475937-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Aug 10, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A plant cultivation light source includes a substrate and a first group of light sources. The first group of light sources includes a plurality of light sources disposed on the substrate, and a light source including a light emitting structure including a first semiconductor layer, an active layer, and a second semiconductor layer. The plurality of light sources operates to emit lights having different wavelength bands and includes a first light source that emits first light having an area of at least about 55% compared with an area of a normalized solar spectrum, a second light source that emits second light having a wavelength for cryptochrome, and a third light source that emits third light having a wavelength for phytochrome.

First claim

What is claimed is:

1. A plant cultivation light source unit, comprising:
a substrate; and
a first group of light sources comprising a plurality of light sources disposed on the substrate, a light source comprising a light emitting structure including a first semiconductor layer, an active layer, and a second semiconductor layer;
wherein the plurality of light sources operates to emit lights having different peak wavelengths and comprises:
a first light source that emits first light having a first light spectrum including an area of at least about 55% overlapped with an area of a normalized solar spectrum;
a second light source that emits second light having a wavelength for cryptochrome; and
a third light source that emits third light having a wavelength for phytochrome,
wherein the first light spectrum includes a peak having a deviation equal to or less than about 0.14 compared with the normalized solar spectrum.

2. The plant cultivation light source unit of claim 1 , further comprising a second group of light sources that have a peak wavelength between 200 nm and 400 nm.

3. The plant cultivation light source unit of claim 2 , wherein the second group of light sources is turned on or off such that a dose of the light is equal to or greater than about 1 kJ/m 2 s and equal to or smaller than about 14 kJ/m 2 s.

4. The plant cultivation light source unit of claim 1 , further comprises a controller coupled to the plurality of light sources in the first group of light sources and controlling a lighting condition and a dark condition,
wherein the first group of light sources is turned off during the dark condition.

5. The plant cultivation light source unit of claim 4 , wherein a ratio of the lighting condition to the dark condition is 1:1 to 2:1.

6. The plant cultivation light source unit of claim 4 , further comprising a second group of light sources that have a peak wavelength between 200 nm to 400 nm; and
the controller is further configured to control the second group of light sources to irradiate light to a selected plant for a predetermined number of hours prior to harvesting of the selected plant.

7. The plant cultivation light source unit of claim 1 , wherein the plurality of light sources in the first group of light sources further comprises an IR light source.

8. The plant cultivation light source unit of claim 1 , wherein the plurality of light sources further comprises a white light emitting diode light source which irradiates at a dose of about 60 μmol/m 2 s.

9. The plant cultivation light source unit of claim 1 , wherein a plant includes a Fabaceae Family plant, or a Poaceae Family plant.

10. The plant cultivation light source unit of claim 1 , wherein the first light source is configured to emit a light having a high light intensity in a blue light peak wavelength in a range of about 440 nm to about 495 nm and a red light peak wavelength in a range of about 620 nm to about 750 nm.

11. A plant cultivation device, comprising:
a plant cultivation light source unit;
a housing that houses a plant and the plant cultivation light source unit installed therein; and
a controller that controls the plant cultivation light source unit;
wherein the plant cultivation light source unit comprises:
a substrate; and
a first group of light sources comprising a plurality of light sources disposed on the substrate, a light source comprising a light emitting structure including a first semiconductor layer, an active layer, and a second semiconductor layer;

wherein the plurality of light sources operates to emit lights having different peak wavelengths and comprises:
a first light source that emits first light having a first light spectrum including an area of at least about 55% overlapped with an area of a normalized solar spectrum;
a second light source that emits second light having a second light spectrum; and
a third light source that emits third light having a third light spectrum,
wherein the first light spectrum includes a peak having a deviation equal to or smaller than about 0.14 compared with the normalized solar spectrum.

12. The plant cultivation device of claim 11 , wherein the plant cultivation light source unit further comprises a second group of light sources that have a peak wavelength between 200 nm and 400 nm.

13. The plant cultivation device of claim 12 , wherein the second group of light sources is turned on or off such that a dose of light is equal to or greater than about 1 kJ/m 2 s and equal to or smaller than about 14 kJ/m 2 s.

14. The plant cultivation device of claim 11 , wherein the controller is coupled to the plurality of light sources in the first group of light sources and controlling a lighting condition and a dark condition, wherein the first group of light sources is turned off during the dark condition.

15. The plant cultivation device of claim 14 , wherein a ratio of the lighting condition to the dark condition is 1:1 to 2:1.

16. The plant cultivation device of claim 14 , wherein the plant cultivation light source unit further comprises a second group of light sources that have a peak wavelength between 200 nm to 400 nm; and
the controller controls the second group of light sources to irradiate light to the plant for a predetermined number of hours prior to harvesting of the plant.

17. The plant cultivation device of claim 11 , wherein the plurality of light sources in the first group of light sources further comprises an IR light source.

18. The plant cultivation device of claim 11 , wherein the plurality of light sources further comprises a white light emitting diode light source which irradiates at a dose of about 60 μmol/m 2 s.

19. The plant cultivation device of claim 11 , wherein the plant includes a Fabaceae Family plant, or a Poaceae Family plant.

Assignees

• Seoul Viosys Co Ltd

Inventors

• Song Hyun Su
• Ko Sang Min
• Koo Jong Hyeon
• Kim Se Ryung
• Kim Jin Won

Classifications

• H05B45/20

  Controlling the colour of the light · CPC title

• F21V23/003

  the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array · CPC title

• F21W2131/109

  of gardens · CPC title

• A01G22/20

  Cereals · CPC title

• A01G22/40

  Fabaceae, e.g. beans or peas · CPC title