Plant growth acceleration using a transparent Eu3+-painted UV-to-red conversion film

Abstract

The stimulation of photosynthesis is a strategy for achieving sustainable plant production. Red light is useful for plant growth because it is absorbed by chlorophyll pigments, which initiate natural photosynthetic processes. Ultraviolet (UV)-to-red wavelength-converting materials are promising candidates for eco-friendly plant cultures that do not require electric power. In this study, transparent films equipped with a UV-to-red wavelength-converting luminophore, the Eu3+ complex, were prepared on commercially available plastic films for plant growth experiments. The present Eu3+-based films absorb UV light and exhibit strong red luminescence under sunlight. Eu3+-painted films provide significant growth acceleration with size increment and biomass production for vegetal crops and trees in a northern region. The plants cultured with Eu3+-painted films had a 1.2-fold height and 1.4-fold total body biomass than those cultures without the Eu3+ luminophores. The present film can promote the plant production in fields of agriculture and forestry.

Characteristic stacked structures and luminescent properties of dinuclear lanthanide complexes with pyrene units

“…The estimated T 1 level indicates ineffective energy transfer from PDDPO to Eu(III) ( 5 D 0 : 17,200 cm -1 ) (Bao et al, 2018). According to a previous report, hfa (S 1 = 24,000 cm - Frontiers in Chemistry frontiersin.org 05 1 , T 1 = 21,700 cm -1 ) (Yamamoto et al, 2018) allows highly efficient energy transfer to Eu(III) ion (Moudam et al, 2009;Shoji et al, 2022). Thus, the Eu(III) emission (λ ex = 325 nm) is considered to originate from the energy transfer from the hfa ligands.…”

Technology and Materials for Passive Manipulation of the Solar Spectrum in Greenhouses

“…[85,91] The idea of using fluorescent films to optimize plant growth in greenhouses is not recent-plastic films with fluorescent pigments were tested as greenhouse covers for a variety of crops including tomatoes and strawberries since as early as 1990, with generally positive results. [92][93][94][95][96][97][98] However, possibly due to recent developments of efficient and more stable fluorophores with tunable spectra, coupled with the growing knowledge of light spectral effects on crops, fluorescent materials have once again become an active area of research in greenhouse technology, with several academic publications just within the last 5 years, [99][100][101][102][103][104][105][106] some reporting as high as 20% increase in crop fresh weight. Commercial manufacturing involving integration of fluorophores in greenhouse cover or screen materials has also seen considerable progress recently [107][108][109][110][111] with claims of positive effects on leaf and stem size, fruit size, and even numbers for a variety of crops such as lettuce, strawberries, tomatoes, and cannabis.…”

Terbium-Doped CsPbI3 Glasses for High-Speed Visible-Light Communication

“…Although significant progress has been made by using blue or green perovskites for high-performance VLC, , the exploration of fast-acting red perovskites is still in its infancy. Furthermore, red lights have extensive application in signaling and warning systems, , medical and therapy practices, and horticulture for plant growth . By simultaneously incorporating VLC into these systems, we can readily actualize the concept of a seamlessly interconnected world where the Internet of Things (IoT) harmoniously integrates diverse domains.…”