Aluminate light conversion agent and preparation method thereof as well as light conversion film containing aluminate light conversion agent

A technology of aluminate and light-transforming agent, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced luminous intensity, easy hydrolysis and photolysis, and fast intensity attenuation, and achieves improved luminous intensity, simple preparation method, Light transmittance has little effect

Active Publication Date: 2017-05-31
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth light conversion agents with organic ligands have good light conversion performance, but their fluorescence lifetime is short, their intensity decays quickly, and their luminous intensity decreases significantly after long-term use. Dye-based light-transforming agents have good compatibility with resins, but most of them are prone to oxidation and decomposition, and their service life is not long. The absorption and conversion efficiency of sunlight is not high, which affects the light transmittance of agricultural film; The chemical properties of the light agent are unstable, easy to hydrolyze and photolyze

Method used

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  • Aluminate light conversion agent and preparation method thereof as well as light conversion film containing aluminate light conversion agent
  • Aluminate light conversion agent and preparation method thereof as well as light conversion film containing aluminate light conversion agent
  • Aluminate light conversion agent and preparation method thereof as well as light conversion film containing aluminate light conversion agent

Examples

Experimental program
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preparation example Construction

[0034] The preparation method of the above aluminate light conversion agent includes the following steps: grinding and mixing metal oxides, nano metal oxides, alkaline earth salts, activators and fluxes uniformly, then adding them into a crucible, and placing them in a high-temperature furnace to proceed with the procedure Heating and cooling: 1) Raise temperature to 250~350℃ at a heating rate of 5~10℃ / min, and react at a constant temperature for 20~40 minutes; 2) Raise temperature to 1500~1600℃ at a heating rate of 5~10℃ / min, constant temperature React for 2 to 4 hours; 3) Cool down to 500 to 600°C at a temperature drop rate of 3 to 8°C / min, then naturally cool to room temperature, and take out the furnace to obtain the aluminate light conversion agent.

[0035] Preferably, the mass ratio of the metal oxide to the nano metal oxide is 1: (0.25-4).

[0036] Preferably, the ratio of the amount of alkaline earth salts to the total amount of metal oxides and nano metal oxides is 1: (0....

Embodiment 1

[0061] Example 1: Aluminate light conversion agent CaAl 12 O 19 :Mn 4+

[0062] 1) Production materials:

[0063] The production materials of samples 1-7 are shown in Table 1:

[0064] Table 1 Production raw material composition table of samples 1-7

[0065]

[0066]

[0067] 2) Production process:

[0068] Will Al 2 O 3 Nano Al 2 O 3 , CaCO 3 , MnCO 3 , MgF 2 Weigh KF and KF according to the ratio in Table 1, grind and mix thoroughly, add them to the crucible, place in a high-temperature furnace, and perform programmed heating and cooling: 1) Raise temperature to 300℃ at a heating rate of 5℃ / min, and react at a constant temperature for 30 minutes; 2) Raise the temperature to 1550°C at a temperature rise rate of 10°C / min, and react at a constant temperature for 3 hours; 3) Cool down to 550°C at a temperature drop rate of 8°C / min, then cool to room temperature naturally, and leave the furnace to obtain the aluminate conversion agent CaAl 12 O 19 :Mn 4+ .

[0069] 3) Luminescence propert...

Embodiment 2

[0074] The excitation spectrum and emission spectrum of the aluminate light conversion agent sample 4 prepared in this embodiment are as follows: figure 1 As shown, the SEM image is as figure 2 Shown. by figure 1 Known: Aluminate conversion agent CaAl 12 O 19 :Mn 4+ The absorption peaks of sample 4 are located at 382nm and 468nm, and the aluminate light conversion agent CaAl is excited by light with wavelengths of 382nm and 468nm. 12 O 19 :Mn 4+ For sample 4, the strongest emission peaks are all located at 655nm. Example 2: Aluminate light conversion agent CaAl 12 O 19 :Mn 4+

[0075] 1) Production materials

[0076] The production raw materials of samples 1-7 are shown in Table 3:

[0077] Table 3 Production raw material composition table of samples 1-7

[0078]

[0079] 2) Production process

[0080] Will Al 2 O 3 Nano Al 2 O 3 , CaCO 3 , Mn 3 O 4 , MgF 2 Weigh KF and KF according to the ratio in Table 3, grind and mix well, add them to the crucible, place in a high-temperature fu...

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Abstract

The invention discloses an aluminate light conversion agent and a preparation method thereof as well as a light conversion film containing the aluminate light conversion agent. The general formula of the aluminate light conversion agent is A1-xZnxAl12O19: Mn<4+>, wherein A is at least one of Ca<2+>, Sr<2+> and Ba<2+> and x is more than or equal to 0 and less than 1. The preparation method comprises the following steps: sufficiently grinding metal oxide, nano metal oxide, alkaline-earth salt, an activating agent and a fluxing agent, and uniformly mixing; adding a mixture into a crucible; putting the crucible into a high-temperature furnace; and carrying out program temperature rising and cooling to obtain the aluminate light conversion agent. The light conversion film containing the aluminate light conversion agent is prepared from the following raw materials in parts by mass: 100 parts of a thin film matrix, 8-45 parts of a master batch matrix, 0.5-10 parts of the aluminate light conversion agent, 0.15-0.3 part of a lubricating agent, 0.5-1.5 parts of a light stabilizer and 0.3-1.5 parts of an antioxygen. The aluminate light conversion agent disclosed by the invention has the advantages of high light emitting strength, high light conversion efficiency, good stability, long service life and simple preparation method; the adding amount in an agricultural thin film is small, and the aluminate light conversion agent has good compatibility with the thin film matrix and has less influences on light transmittance of the thin film.

Description

Technical field [0001] The invention relates to an aluminate light conversion agent, a preparation method thereof and a light conversion film containing the aluminate light conversion agent, and belongs to the technical field of functional materials. Background technique [0002] Photosynthesis is the basis for the survival of plants. More than 90% of the dry matter weight of crops comes from photosynthesis. However, not all wavelengths of sunlight can be used by plants. Generally, only light with wavelengths of 400-480nm (blue region) and 600-680nm (red-orange region) can be absorbed by chlorophyll in plants for photosynthesis. Light conversion agents can convert ultraviolet and green light that plants cannot use in sunlight into blue-violet light and red-orange light required for plant growth, which can effectively improve the lighting conditions of crops, make full use of solar energy, and reduce the use of pesticides and fertilizers , Known as the third generation of physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/24C08L23/06C08L23/12C08L29/04C08L27/06C08L25/06C08L69/00C08L23/08C08L33/12C08K13/02C08K5/20C08K5/098C08K5/09C09K11/64
CPCC08J5/18C08K3/24C08L23/06C08L23/08C08L23/12C08L25/06C08L27/06C08L29/04C08L33/12C08L69/00C08L2203/16C09K11/64C08L23/0853C08K13/02C08K5/20C08K5/098C08K5/09
Inventor 刘晓瑭刘华鼐胡广齐刘应亮
Owner SOUTH CHINA AGRI UNIV
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