The invention belongs to the technical field of light conversion films, and particularly relates to a
rare earth light conversion agricultural film for tomato planting and a preparation method and application thereof. The thin film is of a five-layer co-
extrusion structure, the core is a
rare earth light conversion layer, Sr5 (PO4) 3Cl: Eu < 2 + >
blue light fluorescent
powder and Y2O3: Eu < 3 + >
red light fluorescent
powder which are subjected to multistage
surface modification are contained in the
rare earth light conversion layer, 280-400 nm
ultraviolet light and 500-600 nm green and yellow light in
sunlight can be efficiently converted into 430 + / -10 nm
blue light and 610-660 nm red and
orange light, and the tomato photosynthetic absorption peak is accurately matched. By optimizing the ratio of blue and red fluorescent
powder and adopting
titanate /
silane / PE-g-MAH multi-stage modification, the
dispersity and stability are improved, and an outer weather-proof, double-antifogging and inner heat-preservation anti-dripping functional layer is integrated, so that the light
transmittance is remarkably improved, and the service life is prolonged. After the film is covered, the
photosynthetic efficiency can be enhanced, fruit setting is promoted, the fruit shape is improved, the malformed fruit rate is reduced, the
sugar degree and quality are improved, meanwhile, the
greenhouse temperature is increased by 3-5 DEG C, and tomato yield increasing, quality improving, early maturing, energy saving and consumption reducing are achieved.