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Method for preparing large-area non-cracking colloidal photonic crystal membrane

A colloidal photonic crystal, large-area technology is applied in the field of enhancing the fluorescence intensity of quantum dots, which can solve the problems of complex film-forming steps of photonic crystals, difficult to construct in a large area, easy to crack, etc. good stability

Active Publication Date: 2017-09-01
NANUS NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of photonic crystal film-forming steps such as complicated steps, easy cracking, and difficulty in large-area construction, thereby providing a method for preparing a large-area non-cracking colloidal photonic crystal film

Method used

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  • Method for preparing large-area non-cracking colloidal photonic crystal membrane
  • Method for preparing large-area non-cracking colloidal photonic crystal membrane
  • Method for preparing large-area non-cracking colloidal photonic crystal membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add polyurethane emulsion to the monodisperse polystyrene microsphere emulsion with a particle size of 228nm and a monodispersity coefficient of 1% to make a mixed solution, wherein the mass fraction of polystyrene microspheres is 30%, polyurethane The mass fraction is 1%. Sonicate to disperse evenly until there are no air bubbles. Then use a silk rod to scrape the surface of the PET plastic film with a contact angle of 18°, and wait for the solvent to dry to obtain a non-cracking photonic crystal film.

[0026] figure 1 It is the physical picture of the photonic crystal film, the size is 30*40cm, the photonic crystal film shows a bright green structural color, and the surface is uniform without cracking.

[0027] The photonic crystal film is scanned by electron microscope, the results can be found in figure 2 , the results show that the prepared photonic crystal film is composed of monodisperse colloidal particles, which are closely arranged in short-range order. ...

Embodiment 2

[0034] The particle size is 211nm, and the monodispersity coefficient is 3% surface carboxyl modified monodisperse polystyrene microspheres, add polyurethane emulsion, in the mixed solution that makes, polystyrene microsphere mass fraction is 35%, polyurethane mass fraction The score is 3%. Sonicate to disperse evenly until there are no air bubbles. Then scrape-coat the glass surface with a contact angle of 13° with a silk rod, and wait for the solvent to dry to obtain a non-cracking photonic crystal film.

[0035] Aqueous phase CdTe (emission peak 500nm) was added to 1% PVA aqueous solution to prepare a mixed solution. In the mixed solution, the mass fraction of CdTe was 0.5%, and the mass fraction of PVA was 1%. CdTe / PVA solution was added dropwise on the colloidal photonic crystal film, and spin-coated at a speed of 1500rpm for 45s.

[0036] The size of the obtained photonic crystal film is 35*42cm. The reflection spectrum test of the obtained colloidal photonic crystal f...

Embodiment 3

[0038] Add polyurethane emulsion to the monodisperse polystyrene microspheres with a particle size of 256nm and a monodispersity coefficient of 5%, and in the mixed solution made, the mass fraction of polystyrene microspheres is 25%, and the mass fraction of polyurethane is 25%. The score is 5%. Sonicate to disperse evenly until there are no air bubbles. Then scrape coating on the surface of the silicon wafer with a contact angle of 24° with a wire rod, and the photonic crystal film without cracking can be obtained after the solvent is dried.

[0039] Aqueous phase CdTe (emission peak 610nm) was added to 1.5% PVA aqueous solution to prepare a mixed solution. In the mixed solution, the mass fraction of CdTe is 1%, and the mass fraction of PVA is 1.5%. CdTe / PVA solution was added dropwise on the colloidal photonic crystal film at the forbidden band position 610nm, and spin-coated at a speed of 2000rpm for 60s.

[0040] The size of the obtained photonic crystal film is 32*41cm...

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Abstract

The invention discloses a method for preparing a large-area non-cracking colloidal photonic crystal membrane. The method specifically comprises the following steps: dispersing water-borne polyurethane emulsion in a colloidal particle solution; then using a prepared homogeneous solution as a coating liquid, and coating a hydrophilic substrate with a large-area colloidal photonic crystal membrane in a scraping manner by utilizing a wire rod; spin-coating the surface of the colloidal photonic crystal membrane with a layer of quantum dots. Fluorescence signals of the quantum dots can be remarkably enhanced by utilizing a resonance effect of colloidal photonic crystals in a visible light region. According to the method, the defect that the traditional colloidal photonic crystal membrane is easy to crack is overcome; the method has the advantages of being simple in operation, mild in conditions, easy for large-area construction and the like; the prepared colloidal photonic crystal and quantum dot composite film has very high fluorescence intensity and fluorescence stability; an idea can be provided for preparing a high-power QD-LED device quickly.

Description

technical field [0001] The invention relates to a method for preparing a large-area non-cracking colloidal photonic crystal film, and more specifically relates to utilizing hydrogen bonds in polyurethane to enhance the binding force between colloidal microspheres to realize large-area film-forming of photonic crystals without cracks, and further use A method for enhancing the fluorescence intensity of quantum dots. Background technique [0002] Colloidal photonic crystal is a new type of functional material prepared from monodisperse organic or inorganic colloidal particles by bottom-up method. Due to its long-range ordered periodic arrangement in space and the characteristics of photonic band gap, it is widely used in the fields of display, chemical sensing and fluorescence enhancement. At present, how to solve the problem of large-area film formation without cracking has become a hot spot in the research of photonic crystals. So far, the methods of photonic crystal film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/58G02B1/00C09K11/88
CPCC09K11/883C30B29/58G02B1/005
Inventor 陈苏朱志杰张静
Owner NANUS NEW MATERIAL
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