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Lanthanum-doped ZnO quantum dots with high fluorescent quantum yield, and preparation method and application thereof

A technology of lanthanum doping and quantum dots is applied in the field of lanthanum doped zinc oxide quantum dots and their preparation, which can solve the problems of low fluorescence intensity and fluorescence quantum yield, and achieves the improvement of fluorescence quantum yield, simple process and low cost. Effect

Inactive Publication Date: 2012-11-14
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current problems of ZnO quantum dots are low fluorescence intensity and fluorescence quantum yield.
To achieve practical applications, it is necessary to try to improve its fluorescence intensity and low fluorescence quantum yield

Method used

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  • Lanthanum-doped ZnO quantum dots with high fluorescent quantum yield, and preparation method and application thereof
  • Lanthanum-doped ZnO quantum dots with high fluorescent quantum yield, and preparation method and application thereof
  • Lanthanum-doped ZnO quantum dots with high fluorescent quantum yield, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Will 1×10 -4 mol of lanthanum nitrate in a dry and clean 100mL round bottom flask, add 20mL of absolute ethanol, dissolve under magnetic stirring, add 0.002mol of zinc acetate, heat and reflux under stirring for 1h; add 0.2mLKH-550, continue stirring for 15min, and cool in ice water To 0 ° C, a colorless and transparent ethanol solution of zinc acetate containing lanthanum was obtained. In this solution, the molar concentration of lanthanum is 0.005mol / L; the concentration of zinc acetate ethanol solution is 0.1mol / L.

[0044] Put 0.002mol lithium hydroxide in a dry and clean 50mL Erlenmeyer flask, add 20mL absolute ethanol, ultrasonically disperse and dissolve, cool to 0°C in ice water, and obtain a lithium hydroxide ethanol solution with a concentration of 0.1mol / L.

[0045] The above two solutions were quickly mixed uniformly in an ice-water bath, kept at 0°C and continued to stir for 30 minutes; a colorless and transparent ethanol solution of lanthanum-doped ZnO qu...

Embodiment 2

[0048] Will 2×10 -4 Place 1 mol of lanthanum acetate in a dry and clean 100mL round bottom flask, add 20mL of absolute ethanol, dissolve under magnetic stirring, add 0.002mol of zinc acetate, and heat to reflux for 2h while stirring. Add 0.4mL KH-560, continue to stir for 20min, and cool to 0°C with ice water to obtain a colorless and transparent ethanol solution of zinc acetate containing lanthanum. In this solution, the molar concentration of lanthanum is 0.01mol / L; the concentration of zinc acetate ethanol solution is 0.1mol / L.

[0049] Put 0.0022mol lithium hydroxide in a dry and clean 50mL Erlenmeyer flask, add 20mL of absolute ethanol, ultrasonically disperse for 90min to dissolve, and cool to 0°C in ice water to obtain a lithium hydroxide ethanol solution with a concentration of 0.11mol / L.

[0050]The above two solutions were quickly mixed uniformly in an ice-water bath, kept at 0°C and continued to stir for 30 minutes; a colorless and transparent ethanol solution of l...

Embodiment 3

[0053] Will 4×10 -4 mol of lanthanum chloride, placed in a dry and clean 100mL round bottom flask, added 20mL of absolute ethanol, dissolved under magnetic stirring, added 0.002mol of zinc acetate, heated to reflux for 2h while stirring. Add 0.6mL KH-570, continue to stir for 30min, and cool to 0°C with ice water to obtain a colorless and transparent ethanol solution of zinc acetate containing lanthanum. In this solution, the molar concentration of lanthanum is 0.02mol / L; the concentration of zinc acetate ethanol solution is 0.1mol / L.

[0054] Put 0.0024mol lithium hydroxide in a dry and clean 50mL Erlenmeyer flask, add 20mL absolute ethanol, ultrasonically disperse and dissolve, and cool to 0°C in ice water to obtain a lithium hydroxide ethanol solution with a concentration of 0.12mol / L.

[0055] The above two solutions were quickly mixed uniformly in an ice-water bath, kept at 0°C and continued to stir for 30 minutes; a colorless and transparent ethanol solution of lanthanu...

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Abstract

The invention discloses lanthanum-doped ZnO quantum dots, and a preparation method and an application thereof. The lanthanum-doped ZnO quantum dots are prepared under atmospheric conditions and are uniformly dispersed. The molar ratio of zinc and lanthanum is 100 : 5-50. The preparation method comprises the following steps: firstly, preparing a lanthanum-containing zinc acetate-ethanol solution and a lithium hydroxide-ethanol solution; then mixing the two solutions in ice-water bath, and reacting to form an ethanol solution of the lanthanum-doped ZnO quantum dots; and finally adding deionized water into the obtained solution, centrifuging the solution to separate, removing supernatant, washing repeatedly with anhydrous ethanol and deionized water, and vacuum drying, so that the lanthanum-doped ZnO quantum dots are obtained. The preparation is simple in operation and low in cost, and is helpful to realize industrialized production. The lanthanum-doped ZnO quantum dots have relatively high fluorescent intensity and high fluorescent quantum yield, can be used as additives dispersed uniformly in transparent matrixes to prepare high-end anti-counterfeiting products such as anti-counterfeiting inks, anti-counterfeiting labels, anti-counterfeiting packaging materials, and the like, or can be used for preparing photochromic films or electrochromic nanocomposite films, and can be used for backlights, displays, etc.

Description

technical field [0001] The invention relates to a lanthanum-doped zinc oxide quantum dot and its preparation method and application. More specifically, the invention relates to a lanthanum-doped ZnO quantum dot with high fluorescence quantum yield and its preparation method and application. Background technique [0002] Quantum dots have attracted more and more attention due to their unique photoelectric properties, and have become a research hotspot. As a new type of fluorescent material, semiconductor light-emitting quantum dots are widely used in the fields of light-emitting diode fluorescent materials, biological fluorescent probes, optoelectronic devices, solar cells, photosensitive materials, photocatalytic materials, etc., in nonlinear optics, imaging, biological , anti-counterfeiting and functional materials have very broad application prospects. [0003] Cadmium-based quantum dots have excellent optical properties and are currently the most mature researched type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 付绍云孙丽伟史汉桥李婉男肖红梅
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI