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 easy agglomeration, large particle size of phosphors, opaque composite materials, etc.

Active Publication Date: 2012-12-12
SHANGHAI JIAO TONG 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

Examples

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Embodiment 1

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

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

[0043] Step 2: In the solution obtained in step 1, add TEOS (tetraethylorthosilicate), a surfactant and a catalyst to carry out catalyzed inverse microemulsion polymerization. In the present embodiment, the concrete steps that carry out the inverse microemulsion polymerization reaction of catalysis are:

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Embodiment 2

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

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

[0055] Step 2, in the solution that step 1 obtains, add TEOS, surfactant and catalyst to carry out the inverse microemulsion polymerization reactio...

Embodiment 3

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

[0066] Step 1, the quantum dot ZnSe is first dissolved in an organic reagent, and then dissolved 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, and the solution was mixed with cyclohexane.

[0067] Step 2, in the solution that step 1 obtains, add TEOS, surfactant and catalyst to carry out the inverse microemulsion polymerization reaction of catalysis. In the present embodiment, the concrete steps that carry out the inverse microemulsion polymerization react...

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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 method for preparing a nanocomposite luminescent material, in particular to a method for preparing a nanocomposite luminescent material with silicon dioxide coated quantum dots with an adjustable refractive index. Background technique [0002] LED is a new generation of green and environment-friendly light source. At present, various color LEDs widely used mainly use blue LED to excite phosphor powder to emit corresponding color light. For example, white light LED emits white light by exciting yellow YAG phosphor powder with blue LED. Therefore, In the process of encapsulating LEDs, phosphor powder needs to be mixed with encapsulation materials to form a mixture. However, due to the relatively large particle size of the phosphor powder, precipitation is likely to occur during encapsulation, resulting in uneven distribution of the phosphor powder in the encapsulation material. At the same time, due to the large difference in ...

Claims

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Application Information

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Patent Type & Authority Applications(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 JIAO TONG UNIV
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