Bifunctional light conversion thin film and preparation method thereof

Abstract

The invention discloses a bifunctional light conversion thin film, which is characterized by comprising a thin film substrate, a bifunctional light conversion agent and a first additive, wherein the weight of the bifunctional light conversion agent accounts for 0.1-10% of the weight of the thin film; the weight of the first additive accounts for 0.1-10% of the weight of the thin film; the rest of the thin film is the thin film substrate; the general formula of the bifunctional light conversion agent is Ca(1-x)NxF2: Eu, TM, wherein x is greater than or equal to 0 and less than or equal to 1, N refers to one or more of Ba, Zn, Sr, Mg, Hg and Fe, and TM is selected from one or more of Sm, Cu, Pr, Dy, Tb, Ce, La, Mn and Ag. The bifunctional light conversion thin film disclosed by the invention is good in stability, high in luminous intensity, adjustable in blue / red orange light intensity, and long in service life. The bifunctional light conversion thin film disclosed by the invention can convert ultraviolet light (300-380 nm) and green light (520-560 nm) in sun light into strong blue light (400-500 nm) and red orange light (575-630 nm) capable of promoting the growth of crops.

Description

technical field [0001] The invention relates to a bifunctional light-conversion film and a preparation method thereof. Background technique [0002] So far, a large number of research experiments have proved that in the spectrum irradiated on the earth's surface, not all light of different wavelengths is beneficial to plant growth, and there are two peak areas that are really beneficial to plant photosynthesis: (1) blue light area (400 ~500nm), of which the strongest absorption peak of chlorophyll α is 425nm, and the strongest absorption peak of chlorophyll β, lutein and α-carotene is 440nm; (2) red orange region (600-680nm), of which 645nm is the strongest of chlorophyll β Absorption peak, 660nm is the strongest absorption peak of chlorophyll α. By increasing the blue light or red light exposure to plants, the root system of the crops can be developed, the stems and leaves are lush, the yield and income are increased, and the quality is superior. [0003] However, it can ...

AI Technical Summary

Problems solved by technology

[0003] However, it can be used to manufacture light-changing masterbatches, and can produce the most important material light-changing agent for the growth of crops. Although some progress has been made, most of them focus on monochromatic light-changing agents, such as red light-changing agents. Lighting agents are mainly light-changing agents of rare earth complexes. There are still many problems in the research of this kind of light-changing agents so far: (1) Short fluorescence lifetime

There are very few literatures that report the fluorescence lifetime of organic complex light conversion agents. Even if it is reported, it only works for 3 months. It is used to produce light conversion masterbatches and prepare light conversion films. Soon its light conversion function will decline very quickly, causing it to be unable to synchronize with the life of the membrane

(2) Single optical function

Among the light conversion agents of rare earth organic complexes, only the UV-red conversion function can be used in the light conversion film at present, and there are few reports that can be converted into the blue light required for plant photosynthesis

In addition, in terms of light energy utilization, it can only absorb ultraviolet light, but not green light, which reduces the utilization efficiency of sunlight.

(3) Expensive

Agricultural film is an agricultural product vigorously promoted by the state. It is provided free of charge to growers or subsidized by the government. However, the current use of agricultural film is less than 30%

Although the amount of plastic shed film used in my country ranks first in the world, the technical content of shed film is relatively low, most of which are general-purpose ordinary films, and functional shed films account for less than 20%.

Images