Application of Zwitterionic Dopants in Preparation of Liquid Crystal Materials Based on Dynamic Scattering Mode

A technology of amphoteric ions and dopants, applied in liquid crystal materials, nonlinear optics, instruments, etc., can solve the problems of phase separation, narrow response frequency range, uneven scattering of devices, etc., and achieve the effect of increasing the service life

Active Publication Date: 2020-09-15
SHENZHEN GUOHUA OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Currently disclosed doped inert dye molecule-modified light-changing devices, because the dye molecules doped in the system are non-ionic molecules, the transmittance of the device under the action of an electric field does not exceed 50%, and the response frequency range is narrow (50Hz~ 1000Hz), when the concentration of dye molecules is high, it is easy to phase-separate from the main liquid crystal, resulting in uneven scattering of the device

Method used

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  • Application of Zwitterionic Dopants in Preparation of Liquid Crystal Materials Based on Dynamic Scattering Mode
  • Application of Zwitterionic Dopants in Preparation of Liquid Crystal Materials Based on Dynamic Scattering Mode
  • Application of Zwitterionic Dopants in Preparation of Liquid Crystal Materials Based on Dynamic Scattering Mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take 99.7wt% of the liquid crystal mixture and 0.3wt% of the zwitterionic compound represented by the structural formula 1, mix them, heat to 100° C., mix and stir, and obtain the liquid crystal material of Example 1. Wherein, the liquid crystal mixture used in this example is purchased from HCCH, HNG30400-200, Δε=-8.3, T N-I = 94°C.

[0045]

[0046] The liquid crystal material of Example 1 was filled in a 10 μm thick isotropic phase liquid crystal cell coated with tin oxide electrodes through capillary suction to prepare a DSM device doped with a zwitterionic compound in Example 1. Wait for the device to cool down to room temperature before testing. The test results are as follows: the threshold voltage is 10V (1V / m), the driving voltage is 50V (5V / m), and the frequency is 50Hz. The operating conditions of the device are 25°C and humidity below 40%.

Embodiment 2

[0048] Take 99.7wt% of the liquid crystal mixture and 0.3wt% of the zwitterionic compound represented by the structural formula 2, mix them, heat to 100° C., mix and stir, and obtain the liquid crystal material of Example 2. Wherein, the liquid crystal mixture used in this example is purchased from HCCH, HNG30400-200, Δε=-8.3, T N-I = 94°C.

[0049]

[0050] The liquid crystal material of Example 2 was filled into a 10 μm-thick isotropic phase liquid crystal cell coated with a tin oxide electrode through capillary suction to prepare a DSM device doped with a zwitterionic compound in Example 2. Wait for the device to cool down to room temperature before testing. The test results are as follows: the threshold voltage is 10V (1V / m), the driving voltage is 20V (2V / m), the switching time is about 100ms, the off time is about 100ms, and the service life is >6300 hours. The operating conditions of the device are 25°C and humidity below 40%.

Embodiment 3

[0052] Take 99.7wt% of the liquid crystal mixture and 0.3wt% of the zwitterionic compound represented by the structural formula 3, mix them, heat to 100° C., mix and stir, and obtain the liquid crystal material of Example 3. Wherein, the liquid crystal mixture used in this example is purchased from HCCH, HNG30400-200, Δε=-8.3, T N-I = 94°C.

[0053]

[0054] The liquid crystal material of Example 3 was filled into a 10 μm thick isotropic phase liquid crystal cell coated with a tin oxide electrode through capillary suction to prepare a DSM device doped with a zwitterionic compound in Example 3. Wait for the device to cool down to room temperature before testing. The test results are as follows: the threshold voltage is 10V (1V / m), the driving voltage is 30V (3V / m), and the frequency is 50Hz. The operating conditions of the device are 25°C and humidity below 40%.

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Abstract

The invention discloses the application of zwitterionic compounds in the preparation of liquid crystal materials based on dynamic scattering modes. The invention also discloses a liquid crystal mixture. The liquid crystal compound includes host liquid crystal and a dopant, wherein the dopant is a zwitterionic compound. The invention also discloses a liquid crystal dimming device comprising the liquid crystal compound, and also discloses the application of the liquid crystal dimming device. The invention uses the zwitterionic compound as the dopant to stabilize the dynamic scattering of the liquid crystal material, solves the problem that the dopant has good DSM characteristics but low threshold voltage in the prior art, and prolongs the service life of the DSM-based optical device.

Description

technical field [0001] The invention relates to the application of a zwitterionic dopant in the preparation of a liquid crystal material based on a dynamic scattering mode, and belongs to the field of photoelectric technology. Background technique [0002] Dynamic scattering mode (Dynamic scattering mode, DSM), also known as electrohydrodynamic instability (EHDI) in literature, has been discovered and reported in the 1960s. It was originally applied to the production of scattering-based displays, and the following conditions are usually required to produce the DSM effect: (1) liquid crystals (LCs) have negative dielectric anisotropy; (2) liquid crystals are initially aligned in the same direction ( The liquid crystal is perpendicular to the substrate); (3) There are charge carriers in the form of ions in the liquid crystal, which can improve the conductivity of the liquid crystal, reduce the threshold voltage, and generate turbulent motion. [0003] A typical DSM device con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/58G02F1/13
CPCG02F1/13C09K19/58C09K19/582C09K19/584G02F1/13756C09K19/54C09K2019/528
Inventor 周国富詹媛媛刘丹青阿尔伯特·斯凯宁迪克·杨·波尔
Owner SHENZHEN GUOHUA OPTOELECTRONICS
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