Abstract
As new fluorescent materials, light wavelength conversion materials (light conversion agents) have attracted increasing attention from scientific researchers and agricultural materials companies due to their potential advantages in efficiently utilizing solar energy and increasing crop yield. According to the material properties, the light conversion agents can be divided into fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes. The current researches indicates that the fluorescent dyes have relatively high production costs, poor light stability, difficult degradation processes, and easily cause pollution to the ecological environment. The organic rare-earth complexes have short luminescence times, high production costs, and suffer from rapid decreases in luminescence intensity. Compared with fluorescent dyes and organic rare-earth complexes, although rare-earth inorganic complexes have high luminous efficiency, stable chemical properties, and better spectral matching performance, the existing inorganic light conversion agents have relatively poor dispersibility in agricultural films. According to the research on light conversion agents at home and abroad in recent years, this paper first introduces the three common light conversion agents, namely fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes, as well as their uses in agricultural films and their mechanisms of light conversion. At the same time, the preparation methods, advantages, disadvantages, and existing problems of various light conversion agents are classified and explained. Finally, we predict the development trends for light conversion agents in the future by considering six aspects, namely efficiency, cost, compatibility with greenhouse films, light matching, and light transmittance, in order to provide a reference for the preparation of stable and efficient light conversion agent materials.
Highlights
Agricultural films are polymer materials, such as polyethylene (PE), polyvinyl chloride (PVC), Poly-(butylene adipate-co-terephthalate) (PBAT), Ethylene-vinyl acetate copolymer (EVA), etc
The organic combination of light conversion agent and polymer materials realizes the effective regulation of polymer materials on the solar spectrum, which is an important means to realize the optical functionalization of normal polymer materials like PE, PP, PVC, PBAT and so on
An agricultural film added with a light conversion agent is called a light conversion film, which can convert the lower active wavelength band in photosynthesis to the higher active wavelength band (400–700 nm), in turn changing the ultraviolet (280–380 nm) and yellow green (510–580 nm) wavelengths of sunlight into the blue-violet (400–480 nm) and red-orange (600–700 nm) wavelengths required for plant photosynthesis, improving crop yield and quality [11,12,13,14,15,16,17,18,19,20]
Summary
Agricultural films are polymer materials, such as polyethylene (PE), polyvinyl chloride (PVC), Poly-(butylene adipate-co-terephthalate) (PBAT), Ethylene-vinyl acetate copolymer (EVA), etc. A light conversion agent is a fluorescent material that can convert UV light into blue-violet light or red-orange light In recent years, it has attracted extensive attention and has been actively developed. An agricultural film added with a light conversion agent is called a light conversion film, which can convert the lower active wavelength band in photosynthesis to the higher active wavelength band (400–700 nm), in turn changing the ultraviolet (280–380 nm) and yellow green (510–580 nm) wavelengths of sunlight into the blue-violet (400–480 nm) and red-orange (600–700 nm) wavelengths required for plant photosynthesis, improving crop yield and quality [11,12,13,14,15,16,17,18,19,20]. Based on the research on light conversion agents at home and abroad in recent years, this paper classifies the types of light conversion agents and their preparation methods, summarizes the applications for light conversion films in plants, and predicts the future development directions for light conversion agents and light conversion films
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