Novel fluorescent material for red-light emission

A fluorescent material and red light technology, applied in the field of red light emission new fluorescent materials, can solve the problems of poor optical stability, small detection range, high toxicity, etc., and achieve the effects of low cost, good dispersion 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

Current fluorescent pH probe materials mainly include organic fluorescent dyes, quantum dots and metal-organic framework materials, which have the following disadvantages: poor optical stability, small detection range and high toxicity.

Method used

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  • Novel fluorescent material for red-light emission
  • Novel fluorescent material for red-light emission
  • Novel fluorescent material for red-light emission

Examples

Experimental program
Comparison scheme
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 europium 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 the above solution, stir for 20 minutes; then add 4 millimoles of ammonium fluoride and stir for 30 minutes; transfer the above solution to a 50 milliliter high-temperature reaction kettle, and keep it warm at 120° C. for 5 hours; After cooling, it was centrifuged and washed with deionized water and absolute ethanol, and dried in a vacuum freeze-drying oven for 1 h to obtain the final product.

[0024] Powder X-ray diffraction results show that the product is pure hexagonal NaGdF 4 Mutually( figure 1 ). Transmission electron microscopy observations showed that its morphology was uniform cluster nanoparticles ( figure 2 ), the particle size of a single cluster is about 90nm. Under the excitation of...

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 europium 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; ℃ Insulate for 5 hours; after cooling, wash with deionized water and absolute ethanol by centrifugation, 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 light-emitting materials and relates to a novel fluorescent material for red-light emission and application thereof as a pH (Potential of hydrogen) probe. According to the novel fluorescent material for red-light emission, the molecular formula of a base material of the fluorescent material is Ce / Eu: NaY0.2Gd0.8F4; for the fluorescent pH probe material, Eu<3+> shows multiple linear feature emission peaks under the excitation condition of 254 nm ultraviolet light, the central wavelength of the strongest emission peak is 620 nm, and relatively strong red-light emission is shown; with the pH increasing from 3 to 10, the light-emitting intensity of Eu<3+> ions is weakened linearly. According to the novel fluorescent material for red-light emission and the application thereof, a fluorescent pH detection method is realized through a pH-responsive surface ligand protonation or deprotonation process and regulation and control of energy transferring efficiency, a new idea is provided for obtaining a high-sensitivity fluorescent pH probe material with high photochemical stability, low toxicity and fast response, and the novel fluorescent material is expected to be widely used 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 red 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 suitable for rough measurement. Although the electrochemical pH meter can measure accurately, the system size is large and the design is complicated, so it is suitable for single-point detection. The pH detection method based on nano-fluorescent materials has fast response, high spatial resolution, long-distance measurement, and can be applied to the detection of the internal environment of cells, which has important scientific research value. The current fluorescent pH probe materials mainly include organic fluorescent dyes, quantum dots and metal-organic framework materials, and they have the following disadvantages: poor optical stability, smal...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K11/02C09K11/85G01N21/64
CPCC09K11/025C09K11/7791G01N21/64Y02P20/10
Inventor雷磊徐时清夏涵
OwnerCHINA JILIANG UNIV