Quantum dot-wrapped phase-change paraffin microcapsule, LED device, and preparation methods of phase-change paraffin microcapsule and LED device

A technology of LED devices and phase-change paraffin, applied in chemical instruments and methods, semiconductor devices, electrical components, etc., can solve the problems of hindered development of quantum dots, narrow emission peaks, strong light, strong thermal instability, etc., and achieve weakened saturation The degree of absorption, increasing the surface area, reducing the effect of demanding standards

Pending Publication Date: 2019-12-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Quantum dots (Quantum Dots), as nano-sized luminescent materials, are emerging because of their advantages such as wide absorption peaks, narrow emission peaks, and high fluorescence efficiency. However, quantum dots, especially perovskite quantum dots, are sen

Method used

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  • Quantum dot-wrapped phase-change paraffin microcapsule, LED device, and preparation methods of phase-change paraffin microcapsule and LED device
  • Quantum dot-wrapped phase-change paraffin microcapsule, LED device, and preparation methods of phase-change paraffin microcapsule and LED device
  • Quantum dot-wrapped phase-change paraffin microcapsule, LED device, and preparation methods of phase-change paraffin microcapsule and LED device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] A preparation method of phase change paraffin wax microcapsules encapsulating quantum dots includes the following steps:

[0042] (1) Put methyl methacrylate (MMA), methacrylic acid (MAA), and dicyclohexyl peroxycarbonate (DCPD) as an initiator into the flask, and magnetically stir at 62-65°C for 60- 80min prepolymerization reaction;

[0043] (2) Heat the phase change paraffin to 6°C higher than its phase change temperature to melt, add quantum dots and use shear dispersion means to stir evenly at 7-10KRPM for 10-20min;

[0044] (3) Put the molten phase change paraffin and N,N-methylenebisacrylamide (MBA) as a crosslinking agent into the flask, and mix and react for 10-15min;

[0045] (4) Mix distilled water and polyvinyl alcohol (PVA) as a dispersant in a beaker, heat it to 62-65℃ in a water bath, pour all the liquid in the flask into the beaker, and stir at 7-10KRPM by means of shearing and dispersing. 3-5min, transfer the mixture in the beaker to the flask and react at 72-7...

Example Embodiment

[0054] Example 1

[0055] (1) Put methyl methacrylate (MMA), methacrylic acid (MAA), and dicyclohexyl peroxycarbonate (DCPD) as an initiator into a three-necked flask, magnetically stir at 65°C, and prepolymerize for 60 minutes reaction;

[0056] (2) Heat 38# phase change paraffin wax to 48℃ to melt it, add CdSe-570 quantum dots and stir evenly for 15min using shear dispersion means at 9KRPM speed;

[0057] (3) Put the molten phase change paraffin and N,N-methylenebisacrylamide (MBA) into the above three-neck flask, and mix and react for 15 minutes;

[0058] (4) Mix distilled water and polyvinyl alcohol (PVA) as a dispersant in a beaker, heat it to 65°C in a water bath, pour all the liquid in the above three-necked flask into the beaker, and stir by shear dispersion means at 10KRPM. -5min, transfer the mixed solution in the beaker to a three-necked flask and react at 75℃ for 5h;

[0059] (5) Filter the prepared mixed slurry, wash it with 50℃ distilled water, and dry the obtained solid...

Example Embodiment

[0064] Example 2

[0065] (1) Put methyl methacrylate (MMA), methacrylic acid (MAA), and dicyclohexyl peroxycarbonate (DCPD) as an initiator into a three-necked flask, stir magnetically at 62°C, and carry out 70min prepolymerization reaction;

[0066] (2) Heat 45# phase change paraffin wax to 54°C to melt it, add CdSe-525 quantum dots and stir evenly for 10 minutes using shear dispersion means at 7KRPM speed;

[0067] (3) Put the molten phase change paraffin and N,N-methylenebisacrylamide (MBA) into the above three-necked flask, and mix and react for 10 minutes;

[0068] (4) Mix distilled water and polyvinyl alcohol (PVA) as a dispersant in a beaker, heat it to 63°C in a water bath, pour all the liquid in the three-necked flask into the beaker, and stir for 4 minutes by shearing and dispersing means at 7KRPM. , Transfer the mixed solution in the beaker to a three-necked flask and react at 74℃ for 4h;

[0069] (5) Filter the prepared mixed slurry, wash with 54° C. distilled water, and ...

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Abstract

The invention belongs to the technical field of packaging preparation of light-emitting diode (LED) luminescent materials, and relates to a quantum dot wrapped phase-change paraffin microcapsule, an LED device and preparation methods of the phase-change paraffin microcapsule and the LED device. The quantum dot wrapped phase-change paraffin microcapsule comprises quantum dots, phase-change paraffinand methyl methacrylate-methacrylic acid copolymer shell material, wherein the quantum dots are dispersed and wrapped in the phase-change paraffin which is used as a spherical core of the microcapsule, and the methyl methacrylate-methacrylic acid copolymer outer shell coats the outer surface of the phase-change paraffin wax in a spherical shell shape. The LED device which contains the quantum dot-wrapped phase-change paraffin microcapsule comprises LED lamp beads and a colloid fluorescent coating, wherein the colloid fluorescent coating is doped with the quantum dot-wrapped phase-change paraffin microcapsule, and the colloid fluorescent coating coats light-emitting cup openings of the LED lamp beads. According to the invention, paraffin wax in a liquid state is encapsulated through microcapsules, so that the problem of insufficient scattering performance of quantum dots is solved by optimizing scattering; the surface area is increased through microencapsulation, and heat absorption iscarried out by phase change of the paraffin wax, so that the load of heat dissipation of LED is reduced.

Description

technical field [0001] The invention belongs to the technical field of encapsulation and preparation of LED luminescent materials, and relates to a phase-change paraffin microcapsule wrapped with quantum dots, an LED device and a preparation method. Background technique [0002] As a new generation of high-efficiency and energy-saving lighting sources, LEDs are widely used and have great development prospects. However, as a point light source, LED has a very strong light emitting direction, and it is easy to produce uneven illumination and even blind lighting areas. Heat energy, especially high-power LED lamps, generate serious heat. The above problems are the bottleneck in the development of LED. [0003] Quantum dots (Quantum Dots), as nano-sized luminescent materials, are emerging because of their advantages such as wide absorption peaks, narrow emission peaks, and high fluorescence efficiency. However, quantum dots, especially perovskite quantum dots, are sensitive to ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88C09K5/06H01L33/50B82Y30/00B82Y40/00
CPCC09K11/025C09K5/063C09K11/883C09K11/881H01L33/502B82Y30/00B82Y40/00
Inventor 汤勇于佳栋李宗涛梁观伟杜学威余树东余彬海
Owner SOUTH CHINA UNIV OF TECH
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