Plant Growth Absorption Spectrum Mimicking Light Sources

Jou, Jwo‐Huei; Lin, Cheng-Yao; Li, Tsung-Han; Li, Chieh-Ju; Peng, Shiang-Hau; Yang, Fu-Chin; Thomas, K. R. Justin; Kumar, Dhirendra; Chi, Yun; Hsu, Ban-Dar

doi:10.3390/ma8085240

Cited by 37 publications

(12 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, in the past years, light emitting diodes (LEDs) have become increasingly important as a more energy efficient alternative, in particular for tomato cultivation, which requires a daily light integral of up to 25 mol m −2 d −1 (Moe et al, 2005). Furthermore, in contrast to HPS lighting, which emits dominantly yellow and orange and very little blue light (∼5%) (Terfa et al, 2013), LED lighting can be designed to meet to photosynthesis action spectrum of the crop (Jou et al, 2015). The action spectrum of tomato leaves is well known (McCree, 1971).…”

Section: Introductionmentioning

confidence: 99%

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

et al. 2021

View full text Add to dashboard Cite

Light emitting diodes (LEDs) are an energy efficient alternative to high-pressure sodium (HPS) lighting in tomato cultivation. In the past years, we have learned a lot about the effect of red and blue LEDs on plant growth and yield of tomatoes. From previous studies, we know that plants absorb and utilize most of the visible spectrum for photosynthesis. This part of the spectrum is referred to as the photosynthetically active radiation (PAR). We designed a LED fixture with an emission spectrum that partially matches the range of 400 to 700 nm and thus partially covers the absorption spectrum of photosynthetic pigments in tomato leaves. Tomato plants grown under this fixture were significantly taller and produced a higher fruit yield (14%) than plants grown under HPS lighting. There was no difference in the number of leaves and trusses, leaf area, stem diameter, the electron transport rate, and the normalized difference vegetation index. Lycopene and lutein contents in tomatoes were 18% and 142% higher when they were exposed to the LED fixture. However, the ß-carotene content was not different between the light treatments. Transpiration rate under LED was significantly lower (40%), while the light use efficiency (LUE) was significantly higher (19%) compared to HPS lighting. These data show that an LED fixture with an emission spectrum covering the entire PAR range can improve LUE, yields, and content of secondary metabolites in tomatoes compared to HPS lighting.

show abstract

Section: Introductionmentioning

confidence: 99%

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The leaf area and number profiles, plant biomass, and Photosynthetic rate (Pn) under the as-prepared LED light treatments were examined. We suppose the absorption spectrum of fresh leaf to be the emission spectrum of ideal light10, and then evaluate the “color rendering” of as-prepared LED lights by the Pearson product-moment correlation coefficient and CIE chromaticity coordinates.…”

mentioning

confidence: 99%

Improving “color rendering” of LED lighting for the growth of lettuce

Han

Vaganov

Cao

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Light plays a vital role on the growth and development of plant. On the base of white light with high color rendering to the benefit of human survival and life, we proposed to improve “color rendering” of LED lighting for accelerating the growth of lettuce. Seven spectral LED lights were adopted to irradiate the lettuces under 150 μmol·m−2·s−1 for a 16 hd−1 photoperiod. The leaf area and number profiles, plant biomass, and photosynthetic rate under the as-prepared LED light treatments were investigated. We let the absorption spectrum of fresh leaf be the emission spectrum of ideal light and then evaluate the “color rendering” of as-prepared LED lights by the Pearson product-moment correlation coefficient and CIE chromaticity coordinates. Under the irradiation of red-yellow-blue light with high correlation coefficient of 0.587, the dry weights and leaf growth rate are 2–3 times as high as the sharp red-blue light. The optimized LED light for lettuce growth can be presumed to be limited to the angle (about 75°) between the vectors passed through the ideal light in the CIE chromaticity coordinates. These findings open up a new idea to assess and find the optimized LED light for plant growth.

show abstract

“…It is understood that low quantities of light can maintain the postharvest quality of vegetables and crops by mitigating senescence, and improving phytochemical and nutrient content in several species [41,42,43]. Additionally, it was reported that the luminescence in a certain wavelength range can not only preserve vegetables but also promote plant growth [44,45,46]. Figure 6d,e displays one possible and potential application of our developed sensors in postharvest preservation.…”

Section: Resultsmentioning

confidence: 99%

Paper-Based ZnS:Cu Alternating Current Electroluminescent Devices for Current Humidity Sensors with High–Linearity and Flexibility

Zhang

et al. 2019

Sensors

View full text Add to dashboard Cite

Humidity sensors are indispensable for various electronic systems and instrumentations. To develop a new humidity sensing mechanism is the key for the next generation of sensor technology. In this work, a novel flexible paper-based current humidity sensor is proposed. The developed alternating current electroluminescent devices (ACEL) consist of the electroless plating Ni on filter paper and silver nanowires (AgNWs) as the bottom and upper electrodes, and ZnS:Cu as the phosphor layer, respectively. The proposed humidity sensor is based on ACEL with the paper substrate and the ZnS:Cu phosphor layer as the humidity sensing element. The moisture effect on the optical properties of ACELs has been studied firstly. Then, the processing parameters of the paper-based ACELs such as electroless plated bottom electrode and spin-coated phosphor layer as a function of the humidity-sensitive characteristics are investigated. The sensing mechanism of the proposed sensor has been elucidated based on the Q~V analysis. The sensor exhibits an excellent linearity (R2=0.99965) within the humidity range from 20% to 90% relative humidity (RH) and shows excellent flexibility. We also demonstrate its potential application in postharvest preservation where the EL light is used for preservation and the humidity can be monitored simultaneously through the current.

show abstract

Plant Growth Absorption Spectrum Mimicking Light Sources

Cited by 37 publications

References 43 publications

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

Improving “color rendering” of LED lighting for the growth of lettuce

Paper-Based ZnS:Cu Alternating Current Electroluminescent Devices for Current Humidity Sensors with High–Linearity and Flexibility

Contact Info

Product

Resources

About