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Novel fluorescent material for green light emission and application thereof as pH (Potential of hydrogen) probe

A fluorescent material and green light technology, applied in the field of new green light emitting fluorescent materials, can solve the problems of poor optical stability, small detection range, high toxicity, etc., and achieve the effect of low cost, low toxicity, and uniform shape

Active Publication Date: 2019-07-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current fluorescent pH probe materials mainly include organic fluorescent dyes, quantum dots and metal-organic framework materials. These systems have poor optical stability, small detection range and high toxicity.

Method used

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  • Novel fluorescent material for green light emission and application thereof as pH (Potential of hydrogen) probe
  • Novel fluorescent material for green light emission and application thereof as pH (Potential of hydrogen) probe
  • Novel fluorescent material for green light emission and application thereof as pH (Potential of hydrogen) probe

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 0.54 mmol of gadolinium nitrate, 0.2 mmol of yttrium nitrate, 0.2 mmol of cerium nitrate, 0.06 mmol of terbium nitrate, 1 mmol of sodium chloride and 4 mmol of trisodium citrate into 10 ml of water and stir for 15 minutes Then add 20 milliliters of ethylene glycol in above-mentioned solution, stir 20 minutes; Add 4 millimoles of ammonium fluoride and stir 30 minutes again; o C for 5 hours; after cooling, centrifuge washing with deionized water and absolute ethanol, and dry in a vacuum freeze-drying oven for 1 hour to obtain the final product.

[0024] Powder X-ray diffraction analysis results show that the product is pure hexagonal NaGdF 4 Mutually( figure 1 ). Transmission electron microscope observation showed that its morphology was homogeneous monodisperse cluster nanoparticles ( figure 2 ), the particle size of a single cluster is about 90nm. Under the excitation of xenon lamp with a wavelength of 254nm, Ce / Tb: NaY 0.2 Gd 0.8 f 4 Exhibits a strong Tb 3...

Embodiment 2

[0026] Add 0.67 mmol of gadolinium nitrate, 0.2 mmol of yttrium nitrate, 0.1 mmol of cerium nitrate, 0.03 mmol of terbium nitrate, 1 mmol of sodium chloride and 4 mmol of trisodium citrate into 10 ml of water and stir for 15 minutes Then add 20 milliliters of ethylene glycol in above-mentioned solution, stir 20 minutes; Add 4 millimoles of ammonium fluoride and stir 30 minutes again; o C for 5 hours; after cooling, centrifuge washing with deionized water and absolute ethanol, and dry in a vacuum freeze-drying oven for 1 hour to obtain the final product. The structure and fluorescence properties of this product are similar to those of Example 1.

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Abstract

The invention belongs to the field of inorganic luminescent materials and relates to a novel fluorescent material for green light emission and application thereof as a pH (Potential of hydrogen) probe. According to the novel fluorescent material for the green light emission, the molecular formula of a matrix material of the fluorescent material is Ce / Tb: NaY0.2Gd0.8F4; Tb<3+> of the fluorescent pHprobe material shows multiple linear emission peaks under the condition that the excitation wavelength of ultraviolet light is 254 nm, the central wavelength of the strongest emission peak is 550 nmand relatively strong green light emission is presented; the luminous intensity of Tb<3+> ions is linearly weakened along with the increase of the pH from 3 to 10. According to the novel fluorescent material for the green light emission, a pH responded surface ligand protonation or deprotonation process, and regulation and control of energy transmission are carried out to realize a fluorescent pHdetection method; a novel thought is provided for obtaining a high-sensitivity inorganic fluorescent pH probe material with high photochemical stability, low toxicity and rapid response; the novel fluorescent material is expected to be widely applied in the field of pH detection.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials, and relates to a novel fluorescent material emitting green light and its application as a pH probe. Background technique [0002] The common pH detection methods mainly include pH test paper and electrochemical pH meter. The pH test paper is only suitable for rough measurement. The electrochemical pH meter is large in size and complex in design. It can only be used for single-point detection, and cannot be applied to small devices and cell environments. detection. The fluorescence-based pH detection method has fast response, high spatial resolution, and long-distance measurement. The current fluorescent pH probe materials mainly include organic fluorescent dyes, quantum dots and metal-organic framework materials. These systems have poor optical stability, small detection range and high toxicity. In contrast, active ion-doped fluoride nanocrystals exhibit broad-band emission, high ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/85G01N21/64
CPCC09K11/025C09K11/7773G01N21/6428
Inventor 雷磊徐时清夏涵
Owner CHINA JILIANG UNIV
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