Hydroxylic rare earth light-converting powders with effective conjugated groups and their preparation

Abstract

Invention this disclose one including high -efficient conjugation base group carboxylic acid type tombarthite the smooth powder turns and prepare the method, tombarthite this turn all powder yLi show type M samarium, lanthanum by chemical formula Eux (M), yttrium, gadolinium, serium, three price ion of one of them; L is selected from the carboxyl acid radical of the carboxylic acid of the following conjugation in order to match the body: Unless acrylic acid, the sour in butene, 2,4,-two fifth alkene the sour, or the aromatics which include one or two above-metioned conjugation carboxylic acid bases replaces things; x=0.1-1, y=0-0.9, i=1-4. The tombarthite of this invention is transfered to all powder production cost low, mere stability is good, have logh performance life, absorb the light and disperse to grow and match with the crop all, have good compatibility pharmaceutical dispersiveness with polyethylene resin, etc. with the agricultural fog dispersal in the membrane, it has better match results that auxiliary of dripping etc. flows, the mere film of brick made increases warmly, early-maturing, the fruit is obvious to increase production and produce effects again.

Description

Technical field [0001] The invention relates to the technical field of luminescent materials containing rare earth metals, in particular to a carboxylic acid type rare earth light conversion powder containing high-efficiency conjugated groups and a preparation method thereof. Background technique [0002] Rare earth light-converting powder is a new material for light-converting agricultural film (photoecological agricultural film). The photosynthetic absorption spectrum of crops is mainly concentrated in two peak areas: the blue-violet region with a wavelength of 400-460nm and the wavelength of 600-700nm. The red-orange zone, so the light located in these two zones is beneficial to the growth of crops. In sunlight, the 280-390nm ultraviolet light and the 500-580nm green-yellow light that reach the ground through the atmosphere have little effect on the growth of crops, and are actually "wasted". Light-changing powder is to convert light that is not easily absorbed by crops ...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic light converting powders are mainly inorganic and organic complexes of rare earths. Rare earth inorganic light converting powders have poor compatibility with resins and are difficult to prepare. Rare earth organic light converting powders have the advantages of good compatibility with resins and high luminous intensity. It has become a hot spot in the research of light-converting materials in the near future

According to WO85 / 01945 international patent report, the former Soviet Union used chelates of various rare earth ions as light-transforming materials to make greenhouse films, which can absorb ultraviolet rays and emit red-orange light. Derived on the basis of technology, this kind of light conversion material is mainly β-diketone complexes of rare earths, which has poor photostability and high cost, making it difficult to popularize and apply

In recent years, there have been some domestic patent applications involving carboxylic acid-type rare earth light-converting powders, such as aromatic formic acid, aromatic acetic acid, Aromatic dicarboxylic acid, aromatic tricarboxylic acid and other carboxylic acid-type rare earth light-converting powders, but these light-converting powders are rarely used or the application effect is not ideal. The main reasons are: (1) The carboxyl group in the ligand structure is directly connected to the aryl group, After the complex is formed, the space is crowded and the steric hindrance is large; or it does not match the conjugated group of the carboxylic acid, resulting in low effective energy transfer from the ligand to the rare earth ion, and the low luminous efficiency of the rare earth; (2) the excitation of the light conversion powder The wavelength is short, and most of the maximum excitation wavelength is less than 290nm, which does not match well with the effective excitation light of 280nm-380nm in sunlight, or the emitted light does not match the spectrum required for crop growth, and the light conversion and yield increase effects are poor; (3) due to The reason for the synthesis method, the yield of rare earth light conversion powder and the utilization rate of rare earth are not high (less than 80%)

(4) It does not match the anti-fog, dripping and other additives in the agricultural film, and it is less able to make anti-fog, anti-drip, and weather-resistant multifunctional light-transforming agricultural film