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.
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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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