Difunctional light conversion agent for agricultural film and preparation method thereof

Abstract

The invention discloses a difunctional light conversion agent, which has a general expression of the formula (I): Ca1-x-yBaxSryF2:Eu, TM; in the formula (I), x is not less than 0 and not greater than 1, y is not less than 0 and not greater than 1, TM is one or more of Sm, Cu, Pr, Tb, Ce, La, Dy, Mn and Ag. The difunctional light conversion agent of the invention is prepared by adopting an alkaline earth fluoride as a substrate, Eu as an activator and a metal ion as a sensitizer, which has good stability, high luminous intensity and adjustable blue / blood orange light intensity, and can convert the 300 nm-380 nm ultraviolet light and the 520 nm-560 nm green light in the sunlight into the 400 nm-500 nm strong blue light and the 575 nm-630 nm red orange light. The invention widens the ultraviolet light absorption range of the light conversion agent, enhances the luminous intensity of blue light and is applicable to industrial popularization.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and in particular relates to a new class of dual-function light-changing agents and their preparation methods and applications. Background technique [0002] As we all know, light is the energy source of all life on earth, the origin and evolution of life cannot be separated from light, and the structure and function of organisms are also strongly affected by light. The results of plant physiology research show that 90% of the dry matter weight of crops comes from photosynthesis. The wavelength of sunlight vertically incident on the ground is 280nm-3000nm, not all wavelengths of light can be used by plants. The absorption spectrum of chlorophyll α and β has two peak areas: blue light area (400-480nm) and red-orange area (600-680nm), indicating that blue-violet light and red-orange light are meaningful for photosynthesis. [0003] Plant physiology studies have shown that d...

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Problems solved by technology

Eu 3+ (Eu(III)) Organic Complex Luminescent Materials and CaS:Eu 2+ Rare earth inorganic powder luminescent materials are used to make light-changing agricultural films, but their weather resistance and post-processing performance are poor; the maximum emission peak of Eu3+ is 610nm, and the half-peak width is less than 10nm, while plant chlorophyll a and chlorophyll b are in the red light region The absorption peaks of chlorophyll are located at 660nm and 643nm. Obviously, the utilization rate of chlorophyll to the light converted by the Eu(III) complex is not high; and the production cost of the light conversion agent containing europium is high, and the promotion of the light conversion film is caused by the price. The application is greatly limited; the rare earth sulfide light conversion agent has good spectral matching, but its deliquescence resistance is poor, the compatibility and dispersion in the resin are not good, and the processing performance becomes poor when adding polymer materials to produce films , and its application is also affected; the organic complex light conversion agent has high fluorescence emission intensity, but it has poor stability and fast fluorescence decay when used under all-weather conditions

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