Difunctional light conversion agents and preparation method thereof

A dual-function light-converter and flux technology, which is applied in chemical instruments and methods, luminescent materials, plant protection covers, etc. effect and other problems, to achieve the effect of reducing dust pollution, good weather resistance, and improving light

Active Publication Date: 2013-06-19
FOSHAN ONMILLION NANO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
Its high price hinders its application in light conversion film; in addition, there are few reports about blue light conversion agents, and existing literature reports that green light and ultraviolet light in sunlight can be converted into blue light and blue light. Red-orange light, but the problem of incompatibility between the light-changing agent and the polymer creates a problem for the practical application of the light-changing agent

Method used

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  • Difunctional light conversion agents and preparation method thereof
  • Difunctional light conversion agents and preparation method thereof
  • Difunctional light conversion agents and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Synthetic Ca of bifunctional light conversion agent 0.7 Ba 0.3 F 2 :Eu

[0048] Weigh Ca(NO 3 ) 2 ·4H 2 O(14.8Kg), Ba(NO 3 ) 2 (5Kg), Eu 2 O 3 (17.00g), NH 4 F(11.5Kg), HNO 3 (25ml).

[0049] a. Use HNO first 3 Dissolve Eu 2 O 3 , Add Ca(NO 3 ) 2 ·4H 2 O and Ba(NO 3 ) 2 Prepare 0.25mol / L solution A;

[0050] Prepare 1mol / L NH 4 F solution B.

[0051] b. Under stirring conditions, add solution A dropwise to solution B, continue to stir for 1 hour, centrifuge, and dry at 100°C. The SEM morphological characteristics of the precursor after drying are as attached figure 1 As shown, the actual object is a white block.

[0052] c. The above-mentioned dried precipitate is added with 0.5% of the weight of the precipitated flux CaF 2 After grinding, calcine at 1200°C for 2 hours under CO reducing atmosphere, and gradually cool down to obtain the sample. The SEM morphology of the sample is as attached figure 2 As shown, the actual substance is a white powder.

[0053] (2) Production o...

Embodiment 2

[0056] (1) Synthetic Ca of dual-function light conversion agent 0.75 Zn 0.15 F 2 :Eu,Ce

[0057] Weigh Ca(NO 3 ) 2 ·4H 2 O(17.6Kg), Zn(NO 3 ) 2 , Ce 2 O 3 And MgO (3.2Kg total), Eu 2 O 3 (17.00g), NH 4 F(11.5Kg), HNO 3 (25ml).

[0058] a. Use HNO first 3 Dissolve Eu 2 O 3 , Ce 2 O 3 And MgO, adding Ca(NO 3 ) 2 ·4H 2 O and Zn (NO 3 ) 2 Prepare 0.25mol / L solution A;

[0059] Prepare 1mol / L NH 4 F solution B.

[0060] b. Under stirring conditions, add solution A dropwise to solution B, continue to stir for 1 hour, centrifuge, and dry at 100°C.

[0061] c. Add 10% of the weight of the precipitate to the flux CaCl after the above drying 2 After grinding, the sample is calcined at a high temperature of 800°C for 4 hours under a reducing atmosphere of a nitrogen-hydrogen mixed gas and gradually cooled to obtain a sample.

[0062] The excitation spectrum of the product in the ultraviolet region is attached image 3 As shown, the excitation spectrum in the green region is as attached Figure 4 As...

Embodiment 3

[0066] (1) Synthetic Ca of bifunctional light conversion agent 0.65 Sr 0.30 Fe 0.05 F 2 :Eu

[0067] Weigh Ca(NO 3 ) 2 ·4H 2 O(24.5Kg), Sr(NO 3 ) 2 (11.2Kg), Fe 2 O 3 And Eu 2 O 3 (Total 31.00g), NH 4 F(21.2Kg), HNO 3 (30ml).

[0068] a. Use HNO first 3 Dissolve Eu 2 O 3 , Fe 2 O 3 And Eu 2 O 3 , Add Ca(NO 3 ) 2 ·4H 2 O, Sr(NO 3 ) 2 (11.2Kg) Prepare 0.25mol / L solution A;

[0069] Prepare 1mol / L NH 4 F solution B.

[0070] b. Under stirring conditions, add solution A dropwise to solution B, continue stirring for 1 hour, centrifuge and dry at 100°C.

[0071] c. The above-mentioned dried precipitate is added with 1% flux by weight of the agent precipitate into NaF for grinding, and then in H 2 With N 2 The mixture was calcined at a high temperature of 950°C for 3 hours under a reducing atmosphere and gradually cooled to obtain a sample.

[0072] (2) Production of masterbatch

[0073] Weigh 10kg of the sample of Example 3(1), 30kg of polyvinyl chloride, 0.2kg of zinc stearate, 0.3kg of pentae...

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Abstract

The invention discloses difunctional light conversion agents which are characterized in that a constituting general formula of the difunctional light conversion agents is Ca1-xNxF2:Eu, TM, wherein the x is greater than or equal to 0 and is smaller than or equal to 1, the N is one kind or more kinds selected from Ba, Zn, Sr, Mg, Hg and Fe, and the TM is one kind or more kinds selected from Sm, Cu, Pr, Tb, Ce, La, Dy, Mn and Ag. The difunctional light conversion agents are good in stability, high in luminous intensity, adjustable in blue / red orange light intensity, and capable of being used for production of difunctional light conversion master batches and then for production of difunctional light conversion films. The manufactured difunctional light conversion master batches can carry out pre-dispersion for red light conversion agents, dispersity of the red light conversion agents in film base bodies is improved, dust pollution when on-site operation is carried out is reduced, and thus the manufactured light conversion films have a good light conversion effect. The difunctional light conversion films can convert ultraviolet light (300nm-380nm) and green light (520nm-560nm) in sunlight to strong blue light (400nm-500nm) and red orange light (575nm-630nm) which can promote growth of crops simultaneously.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61C09K11/89C08K3/16C08K3/08C08L23/06C08L23/08C08L27/06C08L23/12C08J3/22A01G13/02
Inventor 胡广齐刘晓瑭方利浮陈焰郑明东
Owner FOSHAN ONMILLION NANO MATERIALS
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