Ultrahigh polarity chiral liquid crystal material, liquid crystal laser and preparation method thereof

A chiral liquid crystal and laser technology, applied in liquid crystal materials, chemical instruments and methods, nonlinear optics, etc., can solve problems that cannot be fundamentally solved, low luminous efficiency, poor stability, etc., to avoid photobleaching and low luminous efficiency , easy film-forming properties, and the effect of improving stability

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology inevitably uses laser dye doping to provide gain, and the problems of low luminous efficiency, poor stability and fluorescent bleaching cannot be fundamentally solved, and there are still great limitations in popularization and application.

Method used

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  • Ultrahigh polarity chiral liquid crystal material, liquid crystal laser and preparation method thereof
  • Ultrahigh polarity chiral liquid crystal material, liquid crystal laser and preparation method thereof
  • Ultrahigh polarity chiral liquid crystal material, liquid crystal laser and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] The preparation method of polar cholesteric liquid crystal with chiral molecule doping concentration of 10% is as follows:

[0110] Using chloroform as a solvent, prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions respectively, and then prepare a mixture solution with a mass ratio of chiral molecule: polar nematic liquid crystal of 1 / 9, and vacuum dry. A homogeneous mixture was obtained, designated 10% S1 / RM734.

[0111]

[0112] for the polar nematic liquid crystal, R 1 , R 2 for methyl

[0113]

[0114] is the chiral molecule, R 1 , R 2 for -C 6 H 13

[0115] The phase transition temperature range of the cholesteric phase was determined using polarized light microscopy and DSC measurements, and the effect of chiral dopant concentration on the pitch was determined using the Cano Wedge method.

[0116] The central wavelength λc of the reflection spectrum of the circularly polarized light selectively reflect...

Embodiment 2

[0118] The preparation method of polar cholesteric liquid crystal with chiral molecule doping concentration of 5% is as follows:

[0119] Using chloroform as a solvent, respectively prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions, and then prepare a mixture solution with a mass ratio of chiral molecule: polar nematic liquid crystal of 1 / 19, and vacuum dry it. A homogeneous mixture was obtained, designated 5% S1 / RM734.

Embodiment 3

[0121] The preparation method of polar cholesteric liquid crystal with chiral molecule doping concentration of 20% is as follows:

[0122] Using chloroform as a solvent, respectively prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions, and then prepare a mixture solution with a mass ratio of chiral molecule: polar nematic liquid crystal of 1 / 4, and vacuum dry it. A homogeneous mixture was obtained, designated 20% S1 / RM734.

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Abstract

The invention discloses an ultra-high polarity chiral liquid crystal material, a liquid crystal laser and a preparation method thereof. A polar nematic phase liquid crystal with an ultrahigh dielectric constant (ε~10 4 ) and superpolar cholesteric liquid crystals. This material is different from general cholesteric liquid crystals, and retains a super strong nonlinear optical effect, which can excite high-intensity second harmonics (more than ten times that of quartz crystals). Based on the amplification effect of the cholesteric phase periodicity on the laser, it can be applied to the fields of laser high-order frequency-doubling modulation and harmonic imaging. The invention adjusts the helical pitch of the cholesteric phase molecules through the concentration of the chiral agent to realize the continuous control of the reflection wavelength of 100-1000nm. At the same time, the material has the characteristics of low temperature sensitivity, which is beneficial to the stable optical signal output of the device in a wide temperature range.

Description

technical field [0001] The invention belongs to the field of preparation and application of liquid crystal materials, and particularly relates to an ultra-high polarity chiral liquid crystal material, a liquid crystal laser and a preparation method thereof. Background technique [0002] Liquid crystal is an important optoelectronic material, which has extremely important application value in the fields of optoelectronic display and spatial light modulation. Usually, nematic liquid crystals only have orientation order but not position order. Although a single molecule has a permanent dipole moment, the distribution probability of the director up and down is the same, so the polarity of the whole liquid crystal system is destructive , does not have ferroelectric properties. [0003] In 2017, Richard Mandle and John Goodby of the University of York in the United Kingdom synthesized a wedge-shaped molecule with a large electric dipole. The study found that the molecule exhibit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/20G02F1/1337G02F1/137
CPCC09K19/20G02F1/13718G02F1/133723C09K2019/2078
Inventor 谢晓晨黄明俊西川浩矢李金星向后润一周俊琛赵秀虎
Owner SOUTH CHINA UNIV OF TECH
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