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Quantum dot fluorescent composite material as well as preparation method and application thereof

A composite material and quantum dot technology, applied in the field of quantum dot fluorescent composite materials and their preparation, can solve problems such as quantum dot agglomeration and fluorescence quenching, and achieve the effects of uniform particle size, improved stability, and improved fluorescence stability.

Active Publication Date: 2018-03-23
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, direct mixing of quantum dots and graphene will lead to agglomeration of quantum dots, and direct contact between quantum dots and graphene will also cause serious fluorescence quenching.

Method used

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  • Quantum dot fluorescent composite material as well as preparation method and application thereof
  • Quantum dot fluorescent composite material as well as preparation method and application thereof
  • Quantum dot fluorescent composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A quantum dot fluorescent composite material, which is composed of graphene and PS microspheres compounded on the graphene; the interior of the PS microspheres is embedded with cadmium selenide quantum dots; the particle size of the PS microspheres is 5 μm, and the surface of the PS microspheres is The surface of graphene is bonded by peptide bonds. The composite mass ratio of graphene to PS microspheres is 0.5:100.

[0062] The preparation steps of the quantum dot fluorescent composite material provided by embodiment 1 are as follows:

[0063] 1) Preparation of PS microspheres

[0064] Dissolve PVP in a mixed solvent composed of ethanol and water, put it into a 250mL four-necked bottle equipped with a thermometer, a stirrer and a condenser, protect it with nitrogen, pre-disperse at 70°C for 30min, and then add monomer styrene ( St) and the initiator AIBN were reacted at 70°C for 12h, and after the reaction was completed, PS microspheres were obtained;

[0065] 2) Sw...

Embodiment 2

[0072] A quantum dot fluorescent composite material, which is composed of graphene and PS microspheres compounded on the graphene; wherein 10% zinc selenide quantum dots are embedded inside the PS microspheres; the particle size of the PS microspheres is 10 μm, and its The surface is bonded to the surface of the graphene through peptide bonds. The composite mass ratio of graphene to PS microspheres is 1:100.

[0073] The preparation steps of the quantum dot fluorescent composite material provided by embodiment 2 are as follows:

[0074] 1) Preparation of carboxylated PS microspheres

[0075]Similar to step 1) of Example 1, the difference is that, based on the quality of styrene, 1% acrylic acid is added to styrene, and 1% divinylbenzene is cross-linked to prepare carboxylated PS microspheres;

[0076] 2) Swelling of quantum dots + carboxylated PS microspheres:

[0077] Based on the mass of styrene, add 10 times of water, 15 times of ethanol, 10% of PVA, 10% of PVP, fully st...

Embodiment 3

[0081] A quantum dot fluorescent composite material, which is composed of graphene and PS microspheres compounded on the graphene; wherein 10% cadmium sulfide quantum dots are embedded inside the PS microspheres; the particle size of the PS microspheres is 20 μm, and the surface of the PS microspheres is Bonded to the surface of graphene via peptide bonds. The composite mass ratio of graphene to PS microspheres is 1:100.

[0082] The preparation steps of the quantum dot fluorescent composite material provided by embodiment 3 are as follows:

[0083] 1) Preparation of PS microspheres

[0084] With the step 1) of embodiment 1

[0085] 2) Swelling of quantum dots + PS microspheres:

[0086] Based on the mass of styrene, add 10 times water, 15 times ethanol, 10% PVA and 10% PVP, stir and mix thoroughly, add 1% PS microspheres and 0.1% quantum dots, after mixing, at a rate of 2mL / min Add water to swell the quantum dot PS microspheres for 1 hour to obtain quantum dot-PS polymer ...

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Abstract

The invention relates to a quantum dot fluorescent composite material as well as a preparation method and application thereof. The quantum dot fluorescent composite material is prepared from the following components: graphene and polymer microspheres compounded on the graphene, wherein quantum dots are embedded into the polymer microspheres; the surfaces of the polymer microspheres are bonded withthe surface of the graphene through peptide bonds. On one hand, the compatibility problem of the quantum dots and a polymer material is improved, the shape of the quantum dot polymer composite material is controlled, and the defect that the graphene is easy to quench when being directly combined with the quantum dots is avoided; on the other hand, an excellent water and oxygen blocking capabilityof the graphene is expressed and invasion, caused by water and oxygen, on the quantum dots is reduced; meanwhile, the stability of the quantum dot composite material is further improved by excellentheat conduction performance of the graphene. The quantum dot@PS microsphere@graphene composite material with a stable compound structure is packaged into a quantum dot LED (Light Emitting Diode), so that the water blocking and oxygen blocking stability of the LED can be further improved under the condition that the optical performance of the quantum dots is not remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a quantum dot fluorescent composite material and its preparation method and application. Background technique [0002] In recent years, quantum dots, as a new type of nano-fluorescent material, have quickly attracted the attention of all walks of life. Quantum dots have many beneficial optical properties, such as precise adjustment of the emission wavelength, narrow half-width of the emission peak, and high yield of fluorescent quantum dots. These advantages can be used to achieve high-quality illumination and ultra- Wide color gamut display. [0003] Quantum dot LEDs generally disperse high-quality quantum dots in a specific wavelength range uniformly in a polymer matrix to form a light conversion layer, and then cover the composite sheet on the LED to achieve the expected ideal optical performance, or the prepared Quantum dots are mixed with resin or silica gel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y30/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/883H01L33/502
Inventor 王恺刘皓宸郝俊杰孙小卫
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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