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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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  • 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 sensitive to air and moisture. As well as the instability to strong light and heat, the further development of quantum dots in the field of optoelectronics is hindered, and the importance of suitable perovskite quantum dot solvents and application methods is highlighted

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

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preparation example Construction

[0041] A method for preparing phase-change paraffin microcapsules wrapped with quantum dots, comprising the steps of:

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

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

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

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

Embodiment 1

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

[0056] (2) Heat 38# phase-change paraffin to 48°C to melt it, add CdSe-570 quantum dots and stir evenly for 15 minutes at 9KRPM by means of shear dispersion;

[0057] (3) Add molten phase-change paraffin and N,N-methylenebisacrylamide (MBA) into the above-mentioned three-necked 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 in a water bath to 65°C, pour all the liquid in the above-mentioned three-necked flask into the beaker, and stir it by means of shear dispersion at 10KRPM for 3 -5min, transfer the mixture in the beaker to a three-necked flask and react at 75°C for 5h;

[0059] (5) Filter the prepared mixed slurry, wash with 50°C distilled water, and dry the res...

Embodiment 2

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

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

[0067] (3) Add molten phase-change paraffin and N,N-methylenebisacrylamide (MBA) into the above-mentioned 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 in a water bath to 63°C, pour all the liquid in the above-mentioned three-necked flask into the beaker, and stir for 4 minutes at 7KRPM by means of shear dispersion , transfer the mixture in the beaker to a three-necked flask and react at 74°C for 4h;

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

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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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