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Carbon quantum dots/eu3+/mesoporous alumina composite luminescent material and its preparation and application

A technology of mesoporous alumina and carbon quantum dots, applied in luminescent materials, thermometers with physical/chemical changes, measuring heat, etc., can solve the problems of no luminescent carbon quantum dots and mesoporous alumina composite optical materials, and achieve Ease of industrial production, short time consumption, and simple preparation process

Active Publication Date: 2019-02-19
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is no report on the preparation of optical materials for temperature sensing by combining luminescent carbon quantum dots and mesoporous alumina in the prior art.

Method used

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  • Carbon quantum dots/eu3+/mesoporous alumina composite luminescent material and its preparation and application
  • Carbon quantum dots/eu3+/mesoporous alumina composite luminescent material and its preparation and application
  • Carbon quantum dots/eu3+/mesoporous alumina composite luminescent material and its preparation and application

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Embodiment 1

[0049] Embodiment 1: fluorescent carbon quantum dots / Eu 3+ / Preparation of Mesoporous Alumina Composite Luminescent Materials

[0050] (1) Preparation of mesoporous alumina doped with trivalent europium: 1.0g P123 as template, then add 0.5g anhydrous citric acid, 15mL absolute ethanol as solvent, stir to obtain a transparent solution, add 1.0mL hydrochloric acid and 1.5 mL glacial acetic acid, add 10mmol aluminum isopropoxide as aluminum source, stir thoroughly for 8h, add 2mL 0.5mol / L Eu(NO 3 ) 3 , continue to stir to obtain a white milky shape, transfer to a 40°C water bath, continue to stir for 4h, transfer to a 60°C oven to dry for 48h, and finally perform high-temperature calcination on the sample. Keep the temperature at 400°C for 240 minutes, then raise the temperature to 800°C at a rate of 10°C / min, keep the temperature for 120 minutes, and then grind to obtain white phosphor. The method is a sol-gel method to prepare the matrix material;

[0051] (2) Preparation ...

Embodiment 2

[0056] Embodiment 2: fluorescent carbon quantum dots / Eu 3+ / Preparation of Mesoporous Alumina Composite Luminescent Materials

[0057] (1) Preparation of mesoporous alumina doped with trivalent europium: refer to Example 1;

[0058] (2) Preparation of fluorescent carbon quantum dots: Dry fresh dried banana peels in an oven at 60°C for 10 hours, take 1.0g of dried banana peels, and 3mL 30%H 2 o 2 Carry out hydrothermal reaction with 30mL deionized water at 180°C, set the time for 4h to obtain a brownish-yellow turbid liquid, filter, centrifuge for 10min at a speed of 12000rpm / min, and dialyze (1000D) to obtain a brownish-yellow liquid, freeze-dry to obtain solid fluorescent carbon quantum dots ;

[0059] (3) Take the solid fluorescent carbon quantum dot prepared in step (2) and mix 100mL deionized water to obtain a carbon dot solution of 0.01g / mL, and then add the carbon dot solution to 1g of the doped three prepared in step (1). Europium-valent mesoporous alumina, stirred...

Embodiment 3

[0061] Embodiment 3: fluorescent carbon quantum dots / Eu 3+ / Preparation of Mesoporous Alumina Composite Luminescent Materials

[0062] (1) Preparation of mesoporous alumina doped with trivalent europium: refer to Example 1;

[0063] (2) Preparation of fluorescent carbon quantum dots: 0.9g p-phenylenediamine and 90mL ethanol, conduct solvothermal reaction in a reaction kettle, set the reaction temperature at 200°C, take 10h, cool down to room temperature, and obtain orange, dark red, gray multilayer The suspension was purified by column using dichloromethane and methanol, followed by continuous plate spotting, washing, filtering, dialysis (1000D), and freeze-drying to obtain solid fluorescent carbon quantum dots.

[0064] (3) Take the solid fluorescent carbon quantum dot prepared in step (2) and mix 100mL deionized water to obtain a carbon dot solution of 0.01g / mL, and then add the carbon dot solution to 1g of the doped three prepared in step (1). Europium-valent mesoporous ...

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Abstract

The invention belongs to the field of composite functional materials and particularly relates to a color-tunable fluorescent carbon quantum dot / Eu<3+> / mesoporous alumina composite luminescent material, preparation thereof and application of the carbon quantum dot / Eu<3+> / mesoporous alumina composite luminescent material in the aspects of temperature sensing and optical devices. The composite luminescent material comprises fluorescent carbon quantum dots, of which surfaces contain hydroxyl or amino, and trivalent-europium-doped mesoporous alumina. According to the composite luminescent material, rare-earth trivalent europium, which emits red light under an ultraviolet lamp, and the fluorescent carbon quantum dots which emit blue light are doped into pore passages of the mesoporous alumina, then, composite fluorescent powder with dual emission peaks is obtained, and the ratio of fluorescence intensity of the two emission peaks in a relatively wide temperature range has a good linear relationship and stability, so that the rapid and effective detection and sensing of temperature can be excellently achieved, and the composite luminescent material can be applied to the aspect of temperature sensing. Due to a tunable color, the composite luminescent material can also be applied to the optical devices.

Description

technical field [0001] The invention belongs to the field of composite functional materials, in particular to a fluorescent carbon quantum dot / Eu with adjustable color 3+ / Mesoporous alumina composite luminescent material and its preparation and application in temperature sensing. Background technique [0002] Temperature is an important fundamental parameter that affects the reaction processes of chemical and biological systems. In various fields, temperature is detected as an important parameter to ensure the effective and reliable operation of the system. Traditional temperature sensors generally use intrusive detectors to measure heat flow, which are not sensitive and cannot detect the temperature of small enclosed spaces. [0003] In recent years, many researchers have focused on the temperature detection of optical sensing materials. General optical temperature sensing materials are based on the detection of fluorescence intensity signals over a broad temperature ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/80G01K11/20
CPCC09K11/7728G01K11/20
Inventor 雷炳富何友玲张浩然刘应亮
Owner SOUTH CHINA AGRI UNIV
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