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A semiconductor quantum dot-doped polymer dispersed liquid crystal containing ag nanoparticles

A nanoparticle and dispersed liquid crystal technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of polymer dispersed liquid crystal structure damage, inability to prepare random lasers, and difficulty in changing the emission band , to achieve the effects of easy regulation of the emission wavelength, broad commercialization prospects, and less harsh preparation conditions

Active Publication Date: 2021-08-17
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of dye-doped polymer-dispersed liquid crystal random lasers are: high laser emission threshold, wide full width at half maximum, poor photostability, complex synthesis process, difficult to change light-emitting band, long production cycle and high cost; and perovskite quantum dots doped The disadvantages of the heteropolymer dispersed liquid crystal structure are: on the one hand, because the perovskite quantum dots are poorly dispersed in the polymer and have a certain destructive effect on the polymer dispersed liquid crystal structure, under the pumping action of the pulsed laser , less stable than other gain media
Random lasers cannot be fabricated at concentrations dispersible in polymer-dispersed liquid crystal structures

Method used

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  • A semiconductor quantum dot-doped polymer dispersed liquid crystal containing ag nanoparticles
  • A semiconductor quantum dot-doped polymer dispersed liquid crystal containing ag nanoparticles
  • A semiconductor quantum dot-doped polymer dispersed liquid crystal containing ag nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A semiconductor quantum dot-doped polymer-dispersed liquid crystal containing Ag nanoparticles, prepared from the following components in parts by mass:

[0041]

[0042]

[0043] Wherein, the nematic liquid crystal includes the following components in parts by mass:

[0044]

[0045] The semiconductor quantum dots are ZnCdSeS / ZnS semiconductor quantum dots.

[0046] The particle size of the Ag nanoparticles was 80 nm.

[0047] The above-mentioned semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nanoparticles is prepared by the following method:

[0048] (1) Nematic liquid crystal, photosensitive polymer polymethyl methacrylate, ZnCdSeS / ZnS semiconductor quantum dots and photoinitiator phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide were heated at 50°C Stir in the dark for 5 minutes to form a mixed solution, then add Ag nanoparticles with a particle size of 80 nm into the mixed solution, perform ultrasonic dispersion for 1 minut...

Embodiment 2

[0059] A semiconductor quantum dot-doped polymer-dispersed liquid crystal with Ag nanoparticles as a scatterer is prepared from the following components in parts by mass:

[0060]

[0061] Wherein, the nematic liquid crystal includes the following components in parts by mass:

[0062]

[0063] The semiconductor quantum dots are ZnCdSeS / ZnS semiconductor quantum dots.

[0064] The particle size of the Ag nanoparticles is 50 nm.

[0065] The above-mentioned semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nanoparticles is prepared by the following method:

[0066] (1) Stir nematic liquid crystal, photosensitive polymer polymethyl acrylate, ZnCdSeS / ZnS semiconductor quantum dots and photoinitiator 2-hydroxy-methylphenylpropan-1-ketone at 50°C in the dark for 5 minutes to form a mixed solution , and then Ag nanoparticles with a particle size of 50 nm were added to the mixed solution, followed by ultrasonic dispersion for 1 min, and then mechan...

Embodiment 3

[0071] A semiconductor quantum dot-doped polymer-dispersed liquid crystal containing Ag nanoparticles, prepared from the following components in parts by mass:

[0072]

[0073] Wherein, the nematic liquid crystal includes the following components in parts by mass:

[0074]

[0075] The semiconductor quantum dots are ZnCdSeS / ZnS semiconductor quantum dots.

[0076] The particle size of the Ag nanoparticles is 20 nm.

[0077] The above-mentioned semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nanoparticles is prepared by the following method:

[0078] (1) Stir nematic liquid crystal, photosensitive polymer polyaminoacrylate, ZnCdSeS / ZnS semiconductor quantum dots and photoinitiator benzoin dimethyl ether at 50°C for 5min in the dark to form a mixed solution, and then mix the particles with a particle size of 20nm After the Ag nanoparticles were added into the mixed solution, ultrasonic dispersion was performed for 1 min, and then mechanica...

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Abstract

The invention relates to a semiconductor quantum dot-doped polymer dispersed liquid crystal containing Ag nanoparticles and a preparation method thereof, which is prepared from the following components in parts by mass: 1-5 parts of semiconductor quantum dots; 20-74 parts of photosensitive polymer ; 20-78 parts of nematic liquid crystal; 1-5 parts of photoinitiator; 0.5-1.5 parts of Ag nanoparticles. The invention also relates to the application of semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nano particles in random laser. The semiconductor quantum dot-doped polymer dispersed liquid crystal containing Ag nanoparticles of the present invention has simple and easy-to-obtain raw materials and low cost, and the obtained random laser has short preparation period, simple preparation process, easy regulation of emission wavelength, low production cost, and With the advantages of higher light intensity and low threshold, it has broad commercial application prospects.

Description

technical field [0001] The invention belongs to the field of liquid crystals, in particular to a semiconductor quantum dot-doped polymer-dispersed liquid crystal containing Ag nanoparticles and a preparation method thereof. The invention also relates to the application of a semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nano particles in a random laser. Background technique [0002] Laser technology has been widely used in many fields such as industry, medical treatment and communication. The core components of random lasers include three elements: pump source, working medium and resonant cavity. The resonant cavity selects the light with a certain frequency and the same direction as the most preferential amplification, and suppresses the light of other frequencies and directions to form a standing wave oscillation, and finally emits in the form of laser light. Random lasers use strongly scattering, disordered, and non-periodic media as reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/20B82Y30/00
CPCB82Y30/00H01S3/20
Inventor 曹明轩乐庆胜王志文杜大明张彦军王颖唐衡云
Owner WUYI UNIV
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