US-20260123586-A1 - LIGHT SOURCE FOR PLANT CULTIVATION

Abstract

A light source for plant cultivation includes at least two light emitting devices supplying light to a plant. Each of the light emitting devices includes a first semiconductor layer doped with a first conductivity type dopant, a second semiconductor layer disposed on the first semiconductor layer and doped with a second conductivity type dopant different from the first conductivity type dopant, and an active layer interposed between the first semiconductor layer and the second semiconductor layer. The light emitting devices emit light towards the plant under a different condition in terms of at least one of wavelength, radiation intensity, and emission timing to control the type and content of phytochemicals in the plant.

Inventors

• Myung-Min Oh
• Yoon-Seon Choi

Assignees

• INDUSTRY-UNIVERSITY COOPERATION FOUNDATION OF CHUNGBUK NATIONAL UNIVERSITY
• SEOUL VIOSYS CO., LTD.

Dates

Publication Date

20260507

Application Date

20260102

Claims (1)

1. 1 . A light device, comprising: a light source; a controller connected to the light source; a fluid regulator connected to the controller; and a power supplier configured to supply electric power to the light source, wherein the light source includes a first light emitter and a second light emitter, each of the first light emitter and the second light emitter including: a first semiconductor layer doped with a first conductivity type dopant; a second semiconductor layer disposed on the first semiconductor layer and doped with a second conductivity type dopant that is different from the first conductivity type dopant; and an active layer interposed between the first semiconductor layer and the second semiconductor layer; wherein the first light emitter is configured to emit a first light having a first light spectrum, and the second light emitter is configured to emit a second light having a second light spectrum, wherein the first light spectrum includes at least one peak wavelength that is different from a peak wavelength of the second light spectrum, wherein the controller is configured to operate the first and second light emitters to emit light under one of different conditions, each of the different conditions including at least one of a different light spectrum, a different radiation intensity, or a different emission timing, wherein the controller is configured to select one of the different conditions for operation of the first and second light emitters based on a user input, wherein the operation is varied such that the first light emitter emits the first light in a first condition, and the second light emitter emits the second light in a second condition, wherein the first condition uses a first radiation intensity that is less than a second radiation intensity used in the second condition.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application a continuation of and claims benefit under 35 U.S.C. § 119 to U.S. application Ser. No. 18/411,166 filed Jan. 12, 2024, which is a continuation of and claims benefit under 35 U.S.C. § 119 to U.S. application Ser. No. 17/137,898 filed Dec. 30, 2020 (now U.S. Pat. No. 11,910,762 issued Feb. 27, 2024), and claims benefit of U.S. Provisional Application No. 62/956,959 filed Jan. 3, 2020, the entire contents of each of which are incorporated herein by reference. FIELD Embodiments of the present disclosure relate to a light source for plant cultivation and, more particularly, to a light source which emits light optimal for synthesis of phytochemicals in a plant. RELATED ART As a luminaire for plant cultivation, various light sources may be used to replace sunlight. Conventionally, incandescent lamps and fluorescent lamps were mainly used as a luminaire for plant cultivation. However, conventional luminaires for plant cultivation only provide light having a specific wavelength suitable for photosynthesis of plants and do not have any additional functions. Plants can synthesize substances useful to humans through resistance to various stresses. Therefore, there is a need for a light source for plant cultivation, which can promote production of substances useful to humans in a plant, a cultivation apparatus including the same, and a cultivation method using the same. SUMMARY Embodiments of the present disclosure provide a light source for plant cultivation which can promote production of substances useful to humans in a plant. Embodiments of the present disclosure provide a plant cultivation method which allows easy cultivation of a plant using the light source for plant cultivation. In accordance with one or more embodiments of the present disclosure, a light source for plant cultivation includes at least two light emitting devices supplying light to a plant. The light emitting devices each includes a first semiconductor layer doped with a first conductivity type dopant, a second semiconductor layer disposed on the first semiconductor layer and doped with a second conductivity type dopant different from the first conductivity type dopant, and an active layer interposed between the first semiconductor layer and the second semiconductor layer. The light emitting devices emit light towards the plant under a different condition. In some embodiments, the different condition includes at least one of wavelength, radiation intensity, and emission timing to control a type and a content of phytochemicals in the plant. In at least one variant, the light emitting devices may include a first light emitting device emitting a first type of light and a second light emitting device emitting a second type of light. The first type of light and the second type of light may have different peak wavelengths. In another variant, the phytochemical may include a first phytochemical and a second phytochemical different from the first phytochemical, and at least one of wavelength, radiation intensity, and emission timing of each of the first type of light and the second type of light may be adjusted such that the content of the first phytochemical in the plant is different from the content of the second phytochemical in the plant. In yet another variant, when the first type of light is emitted for a first period of time and the second type of light is emitted for a second period of time, the second period of time may precede the first period of time such that the content of the first phytochemical in the plant is higher than the content of the second phytochemical in the plant. In yet another variant, when the first type of light is emitted for a first period of time and the second type of light is emitted for a second period of time, the first period of time may precede the second period of time such that the content of the second phytochemical in the plant is higher than the content of the first phytochemical in the plant. In some embodiments, the phytochemical may include kaempferols, hydrocinnamic acids, flavonols, and anthocyanins, particularly at least one selected from among kaempferols and hydrocinnamic acids. In some embodiments, each of the first light emitting device and the second light emitting device may be a light emitting diode. Here, the first type of light may have a wavelength in the UVB spectrum and may have a peak in the wavelength range of about 280 nm to about 300 nm. In at least one variant, the second type of light may have a different wavelength than the first type of light. The second type of light may have a peak in the wavelength range of about 310 nm to about 390 nm. In other embodiments, the plant may be cruciferous plants Cruciferous plants may include at least one selected from among cabbage, Chinese cabbage, kale, broccoli, radish, shepherd's purse, oilseed rape, mustard, and bok choy. In accordance with one or more embodiments of the present disclosure