Preparation method and application of adjustable-refractivity silicon dioxide coated quantum dot nano composite luminescent material

A nano-composite, luminescent material technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of large particle size of phosphors, opaque composite materials, and easy agglomeration.

Active Publication Date: 2014-07-09
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A feasible solution is to disperse the phosphor powder into the outer packaging material to form a transparent composite material. However, due to the large particle size of the traditional phosphor powder (generally micron), it is easy to agglomerate after mixing with the packaging material. cause the composite to be opaque

Method used

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  • Preparation method and application of adjustable-refractivity silicon dioxide coated quantum dot nano composite luminescent material
  • Preparation method and application of adjustable-refractivity silicon dioxide coated quantum dot nano composite luminescent material

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Embodiment 1

[0041] In this embodiment, first prepare SiO 2 Nanocomposite luminescent material coated with quantum dots CdSe / CdS / ZnS, which is made of SiO 2 Composition of nanocomposite particles coated with quantum dots CdSe / CdS / ZnS, where each nanocomposite particle is SiO 2 CdSe / CdS / ZnS nanocomposite particles coated with a single quantum dot. Specific steps are as follows:

[0042] Step 1. Dissolve the quantum dots CdSe / CdS / ZnS in cyclohexane. Among them, the quantum dot CdSe / CdS / ZnS is a quantum dot with a three-layer core-shell structure of CdSe / CdS / ZnS, and its emission wavelength is 520 nm. The quantum dots CdSe / CdS / ZnS were dissolved in cyclohexane to obtain a 10 mL, 1 mM solution.

[0043] Step 2: Add TEOS (tetraethyl orthosilicate), surfactant and catalyst to the solution obtained in step 1, to carry out catalyzed reverse microemulsion polymerization. In this embodiment, the specific steps of the catalyzed reverse microemulsion polymerization reaction are:

[0044] TEOS was added un...

Embodiment 2

[0053] In this embodiment, first prepare SiO 2 Cu:CdS / ZnS nanocomposite luminescent material coated with quantum dots, which is made of SiO 2 Composition of nanocomposite particles coated with quantum dots Cu:CdS / ZnS, where each nanocomposite particle is SiO 2 CdSe / CdS / ZnS nanocomposite particles coated with a single quantum dot. Specific steps are as follows:

[0054] Step 1. The quantum dots Cu:CdS / ZnS are first dissolved in organic reagents and then in cyclohexane. Among them, the quantum dot Cu:CdS / ZnS is a Cu-doped CdS / ZnS two-layer core-shell structure quantum dot, and its emission wavelength is 640 nm; the organic reagent is n-hexane, and the amount of cyclohexane is 9 mL. The quantum dot Cu:CdS / ZnS was dissolved in n-hexane to obtain a 10 mL, 1 mM solution, which was mixed with cyclohexane.

[0055] Step 2: In the solution obtained in Step 1, TEOS, surfactant and catalyst are added to carry out the catalyzed reverse microemulsion polymerization reaction. In this embodimen...

Embodiment 3

[0065] In this embodiment, first prepare SiO 2 Nanocomposite luminescent material coated with quantum dots ZnSe, which is made of SiO 2 Composition of nanocomposite particles coated with quantum dots ZnSe, where each nanocomposite particle is SiO 2 Nanocomposite particles coated with a single quantum dot ZnSe. Specific steps are as follows:

[0066] Step 1: Dissolve the quantum dot ZnSe in an organic reagent first, and then dissolve it in cyclohexane. Among them, the emission wavelength of quantum ZnSe is 370nm; the organic reagent is toluene, and the amount of cyclohexane is 9mL. The quantum dot ZnSe was dissolved in toluene to obtain a 1 mL, 10 mM solution, which was mixed with cyclohexane.

[0067] Step 2: In the solution obtained in Step 1, TEOS, surfactant and catalyst are added to carry out the catalyzed reverse microemulsion polymerization reaction. In this embodiment, the specific steps of the catalyzed reverse microemulsion polymerization reaction are:

[0068] Under stir...

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Abstract

The invention discloses an adjustable-refractivity silicon dioxide coated quantum dot nano composite luminescent material which is composed of SiO2 nanoparticles, wherein each SiO2 particle is a nano composite particle formed by coating SiO2 on a single quantum dot or a nano composite particle formed by coating SiO2 on multiple evenly-dispersed quantum dots. The invention also discloses a method for preparing the nano composite particles (each of which is formed by coating SiO2 on a single quantum dot or coating SiO2 on multiple quantum dots) by inverse microemulsion polymerization reaction. In practical use, the technological parameters, such as consumptions of TEOS (tetraethyl orthosilicate), surfactant, catalyst and quantum dots, reaction time and the like, can be adjusted to adjust the thickness of the SiO2 shell and the proportion of the quantum dot core in the SiO2 coated quantum dot nano composite particles, thereby adjusting the refractivity of the SiO2 coated quantum dot nano composite material. The refractivity of the nano composite luminescent material is adjustable within the range of 1.42-1.98.

Description

Technical field [0001] The invention relates to a preparation method of a nano-composite luminescent material, in particular to a preparation method of a nano-composite luminescent material with adjustable refractive index coated with quantum dots. Background technique [0002] LEDs are a new generation of green and environmentally friendly light sources. Currently, the widely used color light LEDs mainly use blue LEDs to excite phosphors and emit corresponding color light. For example, white light LEDs use blue LEDs to excite yellow light YAG phosphors to emit white light. In the process of packaging the LED, it is necessary to mix the phosphor and the packaging material to form a mixture. However, due to the large phosphor particles, precipitation is prone to occur during packaging, resulting in uneven distribution of the phosphor powder in the packaging material. At the same time, due to the large difference in refractive index between the phosphor and the packaging material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/58C08L63/00C08L83/04C08L33/12C08K9/10C08K3/30C08K3/08
Inventor 李万万孙康赵冰夏王解兵
Owner SHANGHAI JIAOTONG UNIV
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