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Self-supporting film with microstructured surface and method of making the same

A self-supporting, microstructured technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problem of large loss of fluorescence quantum yield, achieve improved quantum yield, improved conversion efficiency, and improved light absorption rate effect

Active Publication Date: 2018-07-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the existing technical literature, it was found that "Towards efficient solid‐state photoluminescence based on carbon‐nanodots and starch composites" (Nanoscale, 2014, 6(21): 13076‐13081) published by SUN M et al. , and "Carbon quantum dots and their applications" (ChemicalSociety Reviews, 2015, 44(1): 362-381) published by ShiYing Lim et al. of the National University of Singapore, the fluorescence quantum yield of the prepared carbon quantum dots in liquid state can be Reaching more than 80%, although the fluorescence quantum efficiency of liquid-phase quantum dots is very high, the loss of fluorescence quantum yield is relatively large after liquid-solid phase transition, and the highest fluorescence quantum yield is 60%; published by Xingliang Dai et al. of Zhejiang University " Solution‐processed, high‐performance light‐emitting diodes based on quantum dots" (Nature, 2014, 515(7525): 96‐99), and "Large‐area luminescent solar concentrators based on / Stokes‐shift‐engineered / ′nanocrystals in a mass‐polymerized PMMA matrix" (Nature Photonics, 2014, 8(5): 392‐399), the cadmium selenide quantum dots prepared by it are fluorescent in liquid state The quantum yield is greater than 90%, even close to 100%, but the loss of fluorescence quantum yield is relatively large after the liquid-solid phase transition, and the fluorescence quantum yield of 45% has been considered to be a relatively high level

Method used

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Embodiment 1

[0026] This embodiment relates to a method for preparing a carbon quantum dot self-supporting film with a microstructure surface, comprising the following steps:

[0027] S 1 , Synthesis of carbon quantum dots by hydrothermal method: Take 787mg of citric acid monohydrate, 250uL of ethylenediamine, 500uL of 25wt% ammonia water and add 10mL of deionized water to fully mix them, then place them in a polytetrafluoroethylene reactor, and heat at 200°C for 2 Hours, after the solution is cooled to room temperature, deionized water is added to dilute to obtain an aqueous solution of carbon quantum dots; the mass percentage range of carbon quantum dots in the solution is [0.02wt%, 0.1wt%], and the fluorescence quantum yield is 72.4%;

[0028] S 2 , the configuration PVA mass percentage is the carbon quantum dots / PVA mixed solution of 5wt%, after stirring evenly, add in the mold that is provided with microstructure at the bottom, the liquid level height is 1~3mm, carbon quantum dots / PV...

Embodiment 2

[0042] This embodiment relates to a method for preparing a CdSe / CdS core-shell structure quantum disk self-supporting film with an inverted pyramid microstructure surface, comprising the following steps:

[0043] S 1 , take 480mg of cadmium acetate and 1.18g of oleic acid and stir at 110°C for 90 minutes in a vacuum environment to obtain a mixed solution of cadmium acetate / oleic acid; disperse 72mg of selenium powder in 2mL of octadecene, inject the mixed solution of cadmium acetate / oleic acid , slowly raised the temperature to 240°C, then added 240mg of cadmium acetate, and continued to heat for 15 minutes to react; then cooled to room temperature, then added 10mL of oleic acid, centrifuged to obtain a precipitate, and dispersed the precipitate in n-hexane to obtain a mixture of n-hexane solution;

[0044] S 2 , Synthesis of CdSe / CdS core-shell structure quantum disk: Take 40 μL of n-hexane mixed solution and add 2 mL of chloroform to mix evenly, then add 20 mg of thioaceta...

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Abstract

The invention provides a self-supporting film provided with a microstructure surface and preparation method thereof in the technical field of fluorescence quantum solutions. Firstly, a fluorescence quantum solution and a PVA solution are respectively prepared, then the fluorescence quantum solution is added to the PVA solution for even mixing, and a fluorescence quantum / PVA mixed solution is obtained; then, the fluorescence quantum / PVA mixed solution is added to a mold provided with a microstructure at the bottom, finally heat curing is performed to prepare the self-supporting film provided with the microstructure surface. By arranging the microstructure on the surface of the fluorescent quantum dot self-supporting film, the solid-state fluorescence quantum yield and the corresponding light conversion efficiency are improved. The self-supporting film can be widely applied in lots of fields of photoelectric devices, biological science and the like.

Description

technical field [0001] The invention relates to a technology in the field of fluorescent quantum dot films, in particular to a self-supporting film with a microstructure surface and a preparation method thereof. Background technique [0002] Due to its unique size effect, quantum confinement effect, macroscopic quantum tunneling effect and surface effect, fluorescent quantum materials exhibit many physical and chemical properties different from macroscopic bulk materials. They are widely used in nonlinear optics, magnetic media, catalysis, medicine and functional materials. It has extremely broad application prospects, and will have a profound impact on the sustainable development of life sciences and information technology, as well as basic research in the material field. Fluorescent quantum materials can basically be divided into two preparation methods: liquid colloid preparation and solid-state epitaxy preparation. Compared with solid-state epitaxy preparation, liquid-ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/65C09K11/88C08J5/18C08L29/04B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C08J5/18C08J2329/04C08L29/04C09K11/02C09K11/65C09K11/883
Inventor 潘葳庞林娜沈文忠钟思华
Owner SHANGHAI JIAOTONG UNIV
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