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Fluorescent photonic crystal thin film and preparation method thereof

A technology of fluorescent photonics and crystals, which is applied in the field of fluorescent photonic crystal thin films and its preparation, can solve the problems of unstable fluorescent performance, complex synthesis of quantum dots, cumbersome operation process, etc., and achieve short preparation cycle, bright structural color, and enhanced spectral intensity Effect

Active Publication Date: 2018-12-18
武汉顺源昇生物医药科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The obtained fluorescent nanospheres have good fluorescence properties, and can well maintain the optical properties of the photonic crystal film itself, but this method also has certain disadvantages, such as the relatively complicated synthesis of quantum dots, cumbersome operation process, and long preparation cycle , Nanocrystalline quantum dots have disadvantages such as photoquenching and photobleaching, and unstable fluorescence properties

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  • Fluorescent photonic crystal thin film and preparation method thereof
  • Fluorescent photonic crystal thin film and preparation method thereof
  • Fluorescent photonic crystal thin film and preparation method thereof

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preparation example Construction

[0032] The present invention provides a method for preparing a fluorescent photonic crystal film, which comprises the following steps:

[0033] (1) Preparation of monodisperse silica nano-microspheres: firstly mix tetraethyl orthosilicate and absolute ethanol, then mix deionized water, ammonia water, and absolute ethanol with the previous solution, and magnetically stir the reaction at room temperature 20 hours; centrifugally wash with ethanol three times to obtain the monodisperse silica nano-microspheres;

[0034] (2) Preparation of composite nano-microspheres: the monodisperse silica nano-microspheres obtained in step (1) and the precursor liquid for preparing carbon quantum dots are uniformly mixed in an autoclave, and reacted at 180° C. for 4-5 hours . After the reaction, it is cooled to room temperature, and centrifugally washed with ethanol for three times to obtain the nanocomposite microspheres;

[0035] (3) Preparation of fluorescent photonic crystal thin film: Dis...

Embodiment 1

[0074] Example 1 Preparation of blue fluorescent photonic crystal thin film

[0075] A blue fluorescent photonic crystal film comprising monodisperse silica nanospheres and carbon quantum dots, see figure 2 ; The particle size of the silica nano-microspheres is 170 nm, and the particle size of the carbon quantum dots is 2 nm. The ratio of ammonia water, deionized water and tetraethyl orthosilicate used in the preparation of monodisperse silica nano-microspheres is 1.85:1.39:1.

[0076] (1) Preparation of monodisperse silica nanospheres: firstly mix 2.08mL of tetraethyl orthosilicate and 50mL of absolute ethanol, and then mix 2.91mL of deionized water, 3.85mL of ammonia water, and 40mL of absolute ethanol. , the above two solutions were mixed at room temperature and under magnetic stirring, and the reaction was continuously stirred for 20 hours. After the reaction, it was washed three times by ethanol centrifugation.

[0077] (2) Preparation of monodisperse silica / carbon qu...

Embodiment 2

[0079] Example 2 Preparation of Green Fluorescent Photonic Crystal Films

[0080] A green fluorescent photonic crystal film, comprising monodisperse silica nano-microspheres and carbon quantum dots; the particle diameter of the silica nano-microspheres is 230 nm, and the particle diameter of the carbon quantum dots is 2 nm. The ratio of ammonia water, deionized water and tetraethyl orthosilicate used in the silicon nanospheres is 1.85:1.44:1.

[0081](1) Preparation of monodisperse silica nanospheres: firstly mix 2.08mL of tetraethyl orthosilicate with 50mL of absolute ethanol, and then mix 3.0mL of deionized water, 3.85mL of ammonia water, and 40mL of absolute ethanol. , the above two solutions were mixed at room temperature and under magnetic stirring, and the reaction was continuously stirred for 20 hours. After the reaction, it was washed three times by ethanol centrifugation.

[0082] (2) Preparation of monodisperse silica / carbon quantum dot composite nano-microspheres:...

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Abstract

The invention provides a fluorescence photon crystal film. The fluorescence photon crystal comprises monodisperse silicon dioxide nano microspheres and carbon quantum dot composite nano microspheres, wherein the carbon quantum dots are arranged on the surfaces of the nano microspheres; the average grain size of the silicon dioxide nano microspheres is 170-270nm; the average grain size of the carbon quantum dots is 2-6nm; and the fluorescence photon crystal can emit blue, green and red fluorescence under the ultraviolet irradiation. The invention also provides a preparation method of the fluorescence photon crystal film. The technical scheme provided by the invention has the advantages of simple synthesis, short preparation period, bright color and the like, and can enhance the spectral intensity.

Description

technical field [0001] The invention belongs to the field of photonic crystals, and more particularly, relates to a fluorescent photonic crystal thin film and a preparation method thereof. Background technique [0002] In 1987, Yablonovitch and John first proposed the new concept of photonic crystal. If the dielectric materials with different dielectric constants are periodically arranged according to certain rules, when the electromagnetic wave propagates in it, due to Bragg scattering, the electromagnetic wave will be modulated to form an energy band. This energy band structure is called the photonic band. A band gap may appear between photonic energy bands, that is, a photonic band gap. Periodic dielectric structures with photonic band gaps are photonic crystals. Due to their unique optical properties, such as photonic band gaps, photonic crystals can be widely used in photonic crystal fibers, modulators, sensors, displays, photonic crystal waveguides, and low-threshold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/23C01B33/18C09K11/65B82Y30/00
CPCB82Y30/00C01B33/18C01P2004/04C01P2004/32C01P2004/62C01P2004/80C03C17/006C03C17/23C03C2217/29C03C2217/42C03C2218/111C09K11/65
Inventor 王建颖戴广超王贤保马鹏常
Owner 武汉顺源昇生物医药科技有限公司
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