High-power light-emitting diode based facility for plant cultivation

Abstract

Based on perspectives of the development of semiconductor materials systems for high-power light-emitting diodes (LEDs), an illumination facility for greenhouse plant cultivation was designed with the dominating 640 nm photosynthetically active component delivered by AlGaInP LEDs and supplementary components from AlGaN (photothropic action, 455 nm) and AlGaAs (photosynthetic 660 nm and photomorphogenetic 735 nm) LEDs. Photosynthesis intensity, photosynthetic productivity and growth morphology as well as chlorophyll and phytohormone concentrations were investigated in radish and lettuce grown in phytotron chambers under the LED-based illuminators and under high-pressure sodium (HPS) lamps with an equivalent photon flux density. Advantages of the high-power LED-based illuminators over conventional HPS lamps, applicability of AlGaInP LEDs for photosynthesis and control of plant growth by circadian manipulation of a relatively weak far-red component were demonstrated.

The effects of LED illumination spectra and intensity on carotenoid content in Brassicaceae microgreens

“…Compared to conventional lamps, LEDs are a compact, energy-efficient, long-lasting, and environmentally friendly source of light. One of the main advantages of LEDs is the possibility of using specific light wavelengths for influencing plant morphology and phytochemical contents (Morrow, 2008;Tamulaitis et al, 2005). Data in the literature have mostly reported about successful cultivation of various plants under different lighting combinations of blue, red, and far-red LEDs (Kopsell & Sams, 2013;Olle & Viršilė , 2013;Stutte, Edney, & Skerritt, 2009;Tarakanov, Yakovleva, Konovalova, Paliutina, & Anisimov, 2012).…”

A Novel Efficient Mn4+ Activated Ca14Al10Zn6O35 Phosphor: Application in Red-Emitting and White LEDs

“…Plants grow better under red LEDs compared to those grown under daylight fluorescent (white) lamps because red light is close to the maximum absorbance for chlorophyll. 16,17 In this regard, searching for a new red phosphor is one of the big challenges in the field of luminescent materials particularly when a red-emitting phosphor is preferred in some occasions with high color purity.…”

“…Plants grow better under red LEDs compared to those grown under daylight fluorescent (white) lamps because red light is close to the maximum absorbance for chlorophyll. 16,17 In this regard, searching for a new red phosphor is one of the big challenges in the field of luminescent materials particularly when a red-emitting phosphor is preferred in some occasions with high color purity.The basic requirements of potential red phosphor for a blue chip scheme are (1) it should have significant absorption in blue; 18,19 (2) it must have high quantum efficiency of the red emission; 20 (3) it must be capable of retaining its luminescent characteristics over long periods at 150°C. 21 Recently, nonrare earth-based eco-friendly phosphors, Mn 4+ -doped crystalline host materials, which can be synthesized under milder conditions, have received great interest.…”

Sol-gel synthesized far-red chromium-doped garnet phosphors for phosphor-conversion light-emitting diodes that meet the photomorphogenetic needs of plants

“…However, light-emitting diodes (LEDs) seem to have many advantages over these lamps and are promising light sources for greenhouses [4][5][6]. First, LEDs are more efficient, produce less excess heat, and can also operate in a blinking mode, thus saving energy [5].…”