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Method of using sol-gel to prepare MgF2 antireflection film

A gel method and anti-reflection technology, which is used in the field of preparing MgF2 anti-reflection films by sol-gel method, can solve the problems of influence, small viewing angle, and reduced contrast.

Inactive Publication Date: 2013-03-20
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liquid crystal display has become the mainstream technology in the display revolution, but it still has many shortcomings in the current practical aspects: the viewing angle is small, it is strongly affected by ambient light, and when the viewing angle exceeds a certain range, the image becomes blurred. Clear, low contrast
[0008] However, the sol-gel method generally prepares oxide materials, and fluoride materials are rarely used as thin films.

Method used

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  • Method of using sol-gel to prepare MgF2 antireflection film
  • Method of using sol-gel to prepare MgF2 antireflection film

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preparation example Construction

[0034] 2) Preparation and drying of the gel film:

[0035] The magnesium fluoride sol prepared in step 1) is combined with dipping and pulling method, spin coating method or roller coating method to prepare magnesium fluoride gel film on glass, quartz or silicon substrate, and then the obtained film is formed at 80 Dry at ~100°C for 5-10 minutes to evaporate excess solvent to obtain a gel dry film;

[0036] 3) Film heat treatment:

[0037] Put the gel dry film prepared in step 2) into a muffle furnace, 2 Or under an Ar gas atmosphere, calcining at a temperature of 300 ° C to 550 ° C for 5 to 50 minutes, that is,

[0038] To increase the thickness of the film, repeat steps 2) and 3) several times.

[0039] figure 2 Is the MgF prepared by the method of the present invention 2Anti-reflection film optical transmission curve. As shown in the figure, the transmittance of the sample at 550nm reaches 98.2%, which is 7-9% higher than that of ordinary glass and higher than that o...

Embodiment 1

[0043] Magnesium hydroxide was dissolved in ethanol, and a clear solution A was obtained after stirring. The ratio of magnesium hydroxide and ethanol in solution A is: magnesium hydroxide: ethanol=1:20. Then dissolve 55% hydrofluoric acid into an appropriate amount of ethanol to obtain solution B. Hydrofluoric acid in solution B: ethanol = 1:15. Stir the A solution, then gradually add the B solution while stirring the A solution. When Mg:HF=1:2 in the mixed solution of A and B, stop the addition of solution B. Then the resulting mixed solution of A and B was refluxed and stirred at 80°C for 24 hours to obtain MgF 2 Sol. The molar ratio of active ingredients in the magnesium fluoride sol is: magnesium hydroxide: hydrofluoric acid: ethanol=1:2.0:50.

[0044] Using the prepared MgF 2 Sol, at room temperature, by dipping, rolling, or suspension coating method, a layer of MgF is pulled on the glass substrate 2 gel film. Subsequently, the obtained gel film was incubated at 8...

Embodiment 2

[0046] Magnesium acetate was dissolved in ethanol and a clear solution A was obtained after stirring. The ratio of magnesium acetate and ethanol in solution A is: magnesium acetate: ethanol=1:100. Then dissolve 55% hydrofluoric acid into an appropriate amount of ethanol to obtain solution B. Hydrofluoric acid in solution B: ethanol = 1:40. Stir the A solution, then gradually add the B solution while stirring the A solution. When Mg:HF=1:2 in the mixed solution of A and B, stop the addition of solution B. Then the resulting mixed solution of A and B was refluxed and stirred at 40°C for 36 hours to obtain MgF 2 Sol. The molar ratio of active ingredients in the magnesium fluoride sol is: magnesium chloride:hydrofluoric acid:ethanol=1:2.0:180.

[0047] Using the prepared MgF 2 Sol, at room temperature, by dipping, rolling, or suspension coating method, a layer of MgF is pulled on the glass substrate 2 gel film. Subsequently, the obtained gel film was incubated at 100° C. f...

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Abstract

The invention discloses a method of using sol-gel to prepare an MgF2 antireflection film. The method of using the sol-gel to prepare the MgF2 antireflection film comprises dissolving magnesium chloride in solvent with a certain amount of hydrofluoric acid as reactant to form MgF2 sol which is stable in performance and good in film-forming property, then obtaining a gel thin film on glass and other substrates combined with a dip-coating method or a roller painting method with the obtained MgF2 sol, and drying the obtained gel thin film in air, carrying out heat treatment, and obtaining a MgF2 thin film with high transmittance. Low-price magnesium chloride and ethanol are used as starting materials, carry out chemical reaction with hydrofluoric acid to form nanosized magnesium fluoride particles and dissolve in the ethanol. Magnesium fluoride sol which is stable in performance and good in film-forming property is formed. After drying and simple heat treatment are carried out to the thin film obtained through a pulling method and a suspended coating method and the like, the magnesium fluoride thin film with the transmittance up to 98% can be prepared.

Description

technical field [0001] The invention belongs to the technical field of reflective film preparation, and relates to a sol-gel method preparation technology of an antireflection film for solar cells, specifically, a method for preparing MgF by using a sol-gel method. 2 Anti-reflective film method. Background technique [0002] Anti-reflection coating, also known as anti-reflection coating, is to coat optical film on the surface of optical components to reduce the reflection of the surface of optical components and increase the transmittance of light, thereby improving the performance in the working wavelength or band. [0003] For the research on anti-reflection film, as early as 1817, Joseph Fraunhofer made the first batch of anti-reflection film by acid etching method. In 1886, Lord Rayleigh discovered that tarnished glass had a lower reflectivity than freshly polished glass because a thin film formed on the surface of the glass had a lower refractive index than the underly...

Claims

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Application Information

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IPC IPC(8): C03C17/22C04B41/50
Inventor 陈源清张古强童少利孙希佳
Owner XIAN UNIV OF TECH