Quantum dot-photon crystal composite film synthesis method

A photonic crystal and composite thin film technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of high fluorescence intensity, low cost and simple process

Inactive Publication Date: 2017-07-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are many studies on quantum dots and stimuli-responsive photonic crystal materials, but the research on combining quantum dot materials with p

Method used

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Examples

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preparation example Construction

[0023] A method for synthesizing a quantum dot-photonic crystal composite thin film provided in an embodiment of the present invention specifically includes the following steps:

[0024] Step (1): At 40-60°C, mix and dissolve sodium borohydride and tellurium powder in a molar ratio of 3.4:1 in water to react for at least one hour to obtain a sodium telluride hydride solution; after the reaction, the solution turns transparent purple and produces tellurium Sodium hydride, take the sodium hydride telluride solution for subsequent use.

[0025] Step (2): Use 1% sodium hydroxide or potassium hydroxide aqueous solution to configure the pH of the cadmium chloride aqueous solution dripped with mercaptopropionic acid to 9-11; take the sodium telluride hydride solution and drop it into the aforementioned cadmium chloride solution In the process, the molar ratio of cadmium chloride to sodium telluride hydride is 2:1; nitrogen gas is introduced to remove oxygen, and condensed and refluxe...

Embodiment 1

[0032] Example 1: Weigh 200 mg of tellurium powder, dissolve 200 mg of sodium borohydride in a round-bottomed flask filled with 20 mL of deionized water, adjust the temperature to 40° C. and stir for 1 hour to obtain a transparent deep purple aqueous solution of sodium tellurium hydride. Use a syringe Draw 14mL for use. Get 230mg of cadmium chloride, 250mg of mercaptopropionic acid and dissolve it in 250mL of water, prepare a 1% sodium hydroxide aqueous solution to adjust the pH value of the cadmium chloride solution to 10 and add 14mL of sodium hydride telluride aqueous solution to it, and add the solution to Deoxygenate by bubbling nitrogen gas into the round bottom flask for 1 hour. Heat the solution to 100° C., condense and reflux for 2 hours to obtain a green cadmium telluride aqueous solution, extract 5 mL of the cadmium telluride solution and add it to 5 mL of water to obtain a 1.5 mmol / L cadmium chloride quantum dot solution.

[0033] Dissolve 10 mL of tetraethyl orth...

Embodiment 2

[0035] Example 2: Weigh 200 mg of tellurium powder, dissolve 200 mg of sodium borohydride in a round-bottomed flask filled with 20 mL of deionized water, adjust the temperature to 60° C. and stir for 1 hour to obtain a transparent deep purple sodium tellurium hydride aqueous solution. Use a syringe Draw 14mL for use. Get 230mg of cadmium chloride, 250mg of mercaptopropionic acid and dissolve it in 250mL of water, prepare a 1% sodium hydroxide aqueous solution to adjust the pH value of the cadmium chloride solution to 11 and add 14mL of sodium hydride telluride aqueous solution to it, and add the solution to Deoxygenate by bubbling nitrogen gas into the round bottom flask for 1 hour. Heat the solution to 100° C., condense and reflux for 4 hours to obtain a yellow cadmium telluride aqueous solution, extract 5 mL of the cadmium telluride solution and add it to 15 mL of water to obtain a 0.75 mmol / L cadmium chloride quantum dot solution.

[0036] Dissolve 10 mL of tetraethyl orth...

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Abstract

The invention discloses a quantum dot-photon crystal composite film synthesis method, which specifically comprises: synthesizing cadmium telluride quantum dots through an aqueous solution synthesis method by using tellurium powder, sodium borohydride and cadmium chloride as raw materials and using mercaptopropionic acid as a stabilizer, preparing quantum dot materials having various colors and covering whole color band by controlling a reaction time, preparing silica microspheres through a stober method, preparing a photon crystal film through a vertical sedimentation self-assembly method, and repeatedly adding the quantum dots onto the photon crystal film in a dropwise manner to prepare the quantum dot-photon crystal composite film. Compared to the quantum dot film, the prepared quantum dot-photon crystal composite film of the present invention has the following advantage that the quantum dot material generates heat when the quantum dot material emits fluorescence due to the three-dimensional gap structure of the photon crystal in the case of the same amount of the quantum dot material so as to substantially improve the heat exchange efficiency with the outside, such that the fluorescence intensity is increased.

Description

technical field [0001] The invention belongs to the technical field of quantum dot luminescent materials, and in particular relates to a synthesis method of a quantum dot-photonic crystal composite thin film. Background technique [0002] Quantum dot material refers to a quasi-zero-dimensional material with three dimensions below 100nm, generally composed of 1-100nm spherical or quasi-spherical semiconductor materials (such as CdS, CdSe, CdTe, ZnSe, etc.). Because the electrons inside the material are confined in all directions, the material will produce a quantum confinement effect, and the energy level of the electrons near the Fermi level is split from a continuous state into separate energy levels, so it can fluoresce after being excited. Due to various microscopic effects, quantum dot materials will exhibit many properties different from those of macroscopic materials, so they have important applications in the fields of biomarkers, solar cells, electronic devices, and ...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02C03C17/34
CPCC03C17/3476C09K11/02C09K11/883
Inventor 郝建原夏丰田周思瑶刘钰叶友全
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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