# US 11,432,472 B2 · Dark cavity lighting system

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- Number: US 11,432,472 B2
- Document ID: US11432472B2
- Status: Granted
- Kind: B2
- Application number: 16/850,963
- Filed: 2020-04-16
- Published: 2020-07-30
- Granted: 2022-09-06
- Earliest claimed: 2011-03-17
- Assignees: Valoya Oy
- Applicants: Valoya Oy
- Inventors: Lars Aikala; Ilkka Kivimäki
- Web page: https://patentgrep.com/patent/US11432472B2

## CPC

- A01G 7/045: {with electric lighting}
- A01G 9/20: Forcing-frames; Lights {, i.e. glass panels covering the forcing-frames}
- A01G 9/249: {Lighting means (with special arrangements for promoting growth A01G7/045)}
- H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures
- H10H 20/8513: {having two or more wavelength conversion materials}
- Y02P 60/14: Measures for saving energy, e.g. in green houses
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A lighting system is provided with an illumination device with a semiconductor light emission solution and device suited for plant cultivation in a greenhouse environment are described. A lighting device with binary alloy quantum dots made by colloidal methods produces a size distribution of quantum dots that produces an emission spectrum similar to the photosynthetically active radiation (PAR) spectrum. The methods and arrangements allow more precise spectral tuning of the emission spectrum for lights used in plant cultivation. Therefore unexpected improvements in the photomorphogenetic control of plant growth, and further improvements in plant production are realized.

## Claims

### Claim 1

A dark cavity lighting system, comprising:
at least one horticultural lighting fixture configured to emit a spectrum including
a first spectral feature in the form of a spectral peak having its peak wavelength in the blue wavelength range of 425-475 nm,
a second spectral feature in the form of a spectral valley having its base value in the cyan wavelength range of 475-500 nm,
a third spectral feature in the form of a broad-band spectral feature extending throughout the green wavelength range of 500-600 nm,
a fourth spectral feature in the form of a spectral peak having its peak wavelength in the red wavelength range of 625-675 nm, and
a fifth spectral feature in the far-red wavelength range of 700-800 nm,
wherein
the fourth spectral feature has a maximum relative emission intensity that is the highest relative emission intensity within the spectrum,
the first spectral feature has a highest relative emission intensity that is non-zero but less than the maximum relative emission intensity,
the third spectral feature has a highest relative emission intensity that is non-zero but less than the maximum relative emission intensity,
the base value of second spectral feature is below all relative intensities of the third spectral feature, and
the fifth spectral feature has a non-zero relative intensity that is below the maximum relative intensity.

### Claim 2 (depends on 1)

The dark cavity lighting system of claim 1, wherein the fifth spectral feature is in the form of a constantly falling slope in the direction of increase of the wavelength.

### Claim 3 (depends on 1)

The dark cavity lighting system of claim 1, wherein spectral peak of the first spectral feature has a maximum of 50 nm Full Width at Half Maximum (FWHM).

### Claim 4 (depends on 1)

The dark cavity lighting system of claim 1, wherein the highest relative emission intensity of the third spectral feature is less than the highest relative emission intensity of the first spectral feature.

### Claim 5 (depends on 1)

The dark cavity lighting system of claim 1, wherein the peak wavelength of the fourth spectral feature is at 660 nm.

### Claim 6 (depends on 2)

The dark cavity lighting system of claim 2, wherein the peak wavelength of the fourth spectral feature is at 660 nm.

### Claim 7 (depends on 1)

The dark cavity lighting system of claim 1, wherein the peak wavelength of the first spectral feature is at 450 nm.

### Claim 8 (depends on 2)

The dark cavity lighting system of claim 2, wherein the peak wavelength of the first spectral feature is at 450 nm.

### Claim 9 (depends on 5)

The dark cavity lighting system of claim 5, wherein the peak wavelength of the first spectral feature is at 450 nm.

### Claim 10 (depends on 6)

The dark cavity lighting system of claim 6, wherein the peak wavelength of the first spectral feature is at 450 nm.