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Self-luminous blue-phase liquid crystal material with stable carbon dots and preparation method of self-luminous blue-phase liquid crystal material

A blue-phase liquid crystal, self-luminous technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of narrow temperature range of blue-phase liquid crystal, limited application of blue-phase materials, instability, etc.

Pending Publication Date: 2022-04-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blue-phase liquid crystal display is essentially based on the traditional non-emitting liquid crystal, which requires additional backlight devices, so the blue-phase liquid crystal display still has the disadvantages of low brightness and low energy efficiency.
[0003] The double-twisted arrangement of blue-phase liquid crystal molecules will inevitably form many high-energy defects on the microscopic level, causing the entire system to be unstable, making the blue-phase liquid crystal temperature range narrow and the phase transition point high. These problems have greatly restricted blue-phase liquid crystals. Application of phase materials
The above problems are currently the biggest reason for restricting the use of blue phase liquid crystals

Method used

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  • Self-luminous blue-phase liquid crystal material with stable carbon dots and preparation method of self-luminous blue-phase liquid crystal material
  • Self-luminous blue-phase liquid crystal material with stable carbon dots and preparation method of self-luminous blue-phase liquid crystal material
  • Self-luminous blue-phase liquid crystal material with stable carbon dots and preparation method of self-luminous blue-phase liquid crystal material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Nematic liquid crystal SLC7011 and chiral substance R5011 were mixed, and the ratio of R5011 was 3.5wt% sonicated.

[0024] Weigh the blue-phase liquid crystal matrix liquid crystal in step 1, and add the carbon dots / dichloromethane solution into the blue-phase liquid crystal system, so that the proportion of carbon dots in the blue-phase liquid crystal is 0.5wt%. Ultrasonic 2h dispersed evenly.

[0025] The above obtained carbon dot / blue phase liquid crystal mixture was ultrasonically heated and volatilized for 6 hours to remove the dichloromethane solvent to obtain the final product.

[0026] The blue phase texture, blue phase temperature domain and fluorescence spectrum of the observed liquid crystal composite, such as Figure 1-3 .

Embodiment 2

[0028] Nematic liquid crystal SLC7011 and chiral substance R5011 were mixed, and the ratio of R5011 was 3.5wt% sonicated.

[0029] Weigh the blue-phase liquid crystal matrix liquid crystal in step 1, and add the carbon dots / dichloromethane solution into the blue-phase liquid crystal system, so that the proportion of carbon dots in the blue-phase liquid crystal is 1.0 wt%. Ultrasonic 2h dispersed evenly.

[0030] The above obtained carbon dot / blue phase liquid crystal mixture was ultrasonically heated and volatilized for 6 hours to remove the dichloromethane solvent to obtain the final product.

[0031] The blue phase texture, blue phase temperature domain and fluorescence spectrum of the observed liquid crystal composite, such as Figure 1-3 .

Embodiment 3

[0033] Nematic liquid crystal SLC7011 and chiral substance R5011 were mixed, and the ratio of R5011 was 3.5wt% sonicated.

[0034] Weigh the blue-phase liquid crystal matrix liquid crystal in step 1, and add the carbon dots / dichloromethane solution into the blue-phase liquid crystal system, so that the proportion of carbon dots in the blue-phase liquid crystal is 1.5wt%. Ultrasonic 2h dispersed evenly.

[0035] The above obtained carbon dot / blue phase liquid crystal mixture was ultrasonically heated and volatilized for 6 hours to remove the dichloromethane solvent to obtain the final product.

[0036] The blue phase texture, blue phase temperature domain and fluorescence spectrum of the observed liquid crystal composite, such as Figure 1-3 .

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Abstract

According to the self-luminous blue-phase liquid crystal material with the stable carbon dots and the preparation method of the self-luminous blue-phase liquid crystal material, the carbon dots with a certain concentration are doped into blue-phase liquid crystals, and the freely moving carbon dots are small in size and are gathered at blue-phase defects, so that the purposes of stabilizing the spatial arrangement structure of the blue phase, widening the temperature range and reducing the phase transition temperature of the blue-phase liquid crystals are achieved. On the other hand, the excellent luminescence property of the carbon dots is combined with a blue-phase liquid crystal system, so that the blue-phase liquid crystal material with self-luminescence property can be prepared. The problems that common blue-phase liquid crystals are narrow in temperature range and cannot emit light by itself are solved. Under the optimal doping proportion, the temperature range of 2.5 DEG C can be widened to the maximum extent, the phase transition temperature is reduced by 12.3 DEG C, and high fluorescence emission is achieved.

Description

technical field [0001] The invention belongs to the field of liquid crystal materials, and in particular relates to a self-luminous blue phase liquid crystal material with stable carbon points and a preparation method thereof. Background technique [0002] Blue-phase liquid crystals (BPLCs), an emerging soft 3D photonic material, can be obtained by adding chiral dopants to cholesteric liquid crystals or to achiral nematic liquid crystals, followed by temperature-induced phase transitions. Driven by the strong chiral force between molecules, blue-phase liquid crystal molecules can self-assemble to form double-twisted helical cylinders, and accumulate in three-dimensional space to form periodic 3D cubic lattice nanostructures. The helical and periodic structures of blue-phase liquid crystals lead to its Unique optical properties, such as selective reflection, circular dichroism, optical rotation and no birefringence, etc. Blue-phase liquid crystal materials have great potenti...

Claims

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Application Information

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IPC IPC(8): C09K19/58
CPCC09K19/586
Inventor 赵东宇崔化若
Owner BEIHANG UNIV
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