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Red fluorescent composite material and preparation method thereof

A technology of fluorescent materials and mixtures, which is applied in the direction of luminescent materials, liquid crystal materials, chemical instruments and methods, etc., and can solve problems such as complex synthesis and complex structural formulas

Active Publication Date: 2021-12-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these molecules with aggregation-induced luminescent effect usually have complex structural formulas, and the synthesis is relatively complicated, which has certain limitations in application.

Method used

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  • Red fluorescent composite material and preparation method thereof
  • Red fluorescent composite material and preparation method thereof
  • Red fluorescent composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Prepare a film mold: take a 2cm×3cm glass slide, use water and absolute ethanol to clean it ultrasonically for 10 minutes, and dry it in an oven for later use. A 3 wt.% polyamic acid / DMF solution was dropped onto a glass slide, and spin-coated at a speed of 2000r / min for 20s. The glass slide coated with the polyamic acid / DMF solution was dried in an oven at 100°C for 1 hour, and then heated to 250°C for cyclization for 2 hours. After the reaction is complete, take the glass slide and polish it in one direction with a flannelette to make microgrooves parallel to the long side on the surface. Take a polyimide (PI) film with a thickness of 25 μm and cut it into thin strips of 1 mm×2 cm, place them on both sides of the glass slide, cover another piece of glass, and fix the edges with glue, such as figure 1 Shown in (a).

[0045] 2. Preparation of composite film: Weigh 80mg monomer RM23, 320mg monomer RM82, 100mg liquid crystal small molecule 5CB, 5mg initiator 819, mix...

Embodiment 2

[0049] 1. The method for preparing the film mold is the same as the method for preparing the film mold in Example 1.

[0050] 2. Preparation of composite film: Weigh 400mg of monomer RM257, 100mg of liquid crystal small molecule 5CB, and 5mg of initiator 819, mix and place in an oven at 100°C for 1 hour to melt and mix the precursor mixture evenly. Take a small amount of precursor mixture and place it at the entrance of the mold, and the precursor mixture will fill the mold. Lower the temperature to 65°C and keep it warm for 30 minutes to align the mesogens, and then irradiate with a 365nm light source for 30 minutes.

[0051]

[0052] 3. Fluorescence phenomenon is the same as that in Example 1.

Embodiment 3

[0054] 1. The method for preparing the film mold is the same as the method for preparing the film mold in Example 1.

[0055] 2. Preparation of composite film: Weigh 80mg monomer RM23, 320mg monomer RM82, 100mg liquid crystal small molecule 5CB, 5mg initiator 2959, mix and add 0.5mL dichloromethane to dissolve, shake evenly. The precursor mixture was placed at room temperature for 12 hours to volatilize the solvent dichloromethane, and then placed in a vacuum oven at 40° C. for 6 hours to fully volatilize the solvent. Take a small amount of precursor mixture and place it at the entrance of the mold, place the mold on a hot stage at 100°C, and the precursor mixture will melt and fill the mold. Lower the temperature to 65°C and keep it warm for 30 minutes to align the mesogens, and then irradiate with a 365nm light source for 30 minutes.

[0056]

[0057] 3. Fluorescence phenomenon is the same as that in Example 1. The fluorescence excitation and emission spectra of the fil...

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Abstract

The invention discloses a red fluorescent composite material and a preparation method thereof, and belongs to the field of organic solid fluorescent materials. The preparation method comprises the following steps: mixing biphenyl micromolecules, a cross-linkable polymer monomer and an initiator according to a certain ratio to prepare a precursor mixture, melting at the temperature below the decomposition temperature of the initiator, injecting into a mold, and initiating a cross-linking reaction to cure a precursor, thereby obtaining the composite material. When illumination with a certain wavelength is applied, red fluorescence emitted by the sample can be observed. A material capable of emitting linearly polarized light or circularly polarized light can be prepared by adjusting the proportion of liquid crystal components in the precursor mixture. The fluorescent composite material can be prepared without synthesizing complex organic matters, is simple and convenient, can be produced in batches, and has potential application in the fields of liquid crystal display, biological / chemical sensors, optical data communication and the like.

Description

technical field [0001] The invention belongs to the field of organic solid-state fluorescent materials, and in particular relates to a red fluorescent composite material and a preparation method thereof. Background technique [0002] Fluorescent materials have important applications in bioimaging, bio / chemical sensors, optics, and electronics. Traditional fluorescent materials usually have a large planar conjugated structure. Due to the existence of intermolecular π-π stacking under high concentration or aggregation state, the fluorescence signal will be weakened or disappeared, that is, aggregation-induced quencher (Aggregation-caused quencher, ACQ )effect. Therefore, it is necessary to reduce its concentration to make a dispersion solution during application, but this method also reduces the fluorescence intensity, which affects its scope of use. [0003] In 2001, Tang Benzhong's research group discovered a new type of fluorescent material (HPS, 1-methyl-1,2,3,4,5-pentap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/20C08F222/14C08F220/34C08F122/20C08J5/18C08L35/02C09K11/06C09K19/54
CPCC08F222/102C08F122/20C08J5/18C09K11/06C09K19/542C09K2211/1425C09K2211/1433C08J2335/02C08F220/34
Inventor 于海峰李皓敏李岩马树灯
Owner PEKING UNIV