Ratio type red light emitting fluorescent material and application of fluorescent material as ratio type fluorescent pH probe

A fluorescent material and ratiometric technology, which is applied in the application of ratiometric fluorescent pH probes and in the field of ratiometric red light-emitting fluorescent materials, can solve the problems of poor optical stability, small detection range, and high toxicity, and achieve low cost and low cost. Effect of toxicity, uniform shape

Inactive Publication Date: 2019-08-30
CHINA JILIANG UNIV
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  • 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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  • Ratio type red light emitting fluorescent material and application of fluorescent material as ratio type fluorescent pH probe
  • Ratio type red light emitting fluorescent material and application of fluorescent material as ratio type fluorescent pH probe
  • Ratio type red light emitting fluorescent material and application of fluorescent material as ratio type fluorescent pH probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.54 mmol of gadolinium nitrate, 0.2 mmol of lutetium nitrate, 0.2 mmol of cerium nitrate, 0.06 mmol of europium nitrate, 1 mmol of sodium chloride and 3 mmol of trisodium citrate into 10 ml of water and stir for 15 minutes ; Then add 20 ml of ethylene glycol to the above solution and stir for 20 minutes; then add 4 millimoles of ammonium fluoride and stir for 30 minutes; transfer the above solution to a 50 ml high-temperature reaction kettle, o C heat preservation for 5 hours; after cooling, centrifugal washing with deionized water and absolute ethanol, drying in a vacuum freeze-drying box for 1 hour to obtain the final product.

[0023] The powder X-ray diffraction analysis results show that the product obtained is pure hexagonal NaGdF 4 phase( figure 1 ). Transmission electron microscope observation showed that its morphology is uniform monodisperse cluster type nanoparticles ( figure 2 ), the particle size of a single cluster is about 90nm. Excited by a xenon lamp...

Embodiment 2

[0025] Add 0.67 mmol of gadolinium nitrate, 0.2 mmol of lutetium 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 ml of ethylene glycol to the above solution and stir for 20 minutes; then add 4 millimoles of ammonium fluoride and stir for 30 minutes; transfer the above solution to a 50 ml high-temperature reaction kettle, o C heat preservation for 5 hours; after cooling, centrifugal washing with deionized water and absolute ethanol, drying in a vacuum freeze-drying box for 1 hour to obtain the final product. The structure and fluorescence characteristics of the product are similar to those of Example 1.

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Abstract

The invention belongs to the field of inorganic luminescent materials, and in particular relates to a ratio type red light emitting fluorescent material and an application of the fluorescent materialas a pH probe. A base material of the ratio type red light emitting fluorescent material has a molecular formula of Ce / Eu:NaLu0.2Gd0.8F4, under the conditions that the excitation wavelength of ultraviolet light is 254 nm, Ce<3+> exhibits broadband emission, and the light emission wavelength range is from 300 nm to 480 nm, the strongest emission peak central wavelength of Eu<3+> is 620 nm, and stronger red emission is exhibited as a whole; and a fluorescence intensity ratio of the Eu<3+> to the Ce<3+> changes significantly as the pH is increased from 4 to 10. The fluorescent material provided by the invention can be applied to ratio type fluorescent pH detection. According to the fluorescent material provided by the invention, the ratio type detection method is not interfered by the external environment and has very high accuracy; the ratio type fluorescence pH detection method based the inorganic material provided by the invention provides a novel idea for obtaining the high-sensitivity inorganic fluorescent pH probe material with high photochemical stability, low toxicity and fast responsiveness and 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 in particular relates to a ratio-type red light emitting fluorescent material and its application as a ratio-type fluorescent pH probe. Background technique [0002] Common pH testing 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 complicated 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 can be measured at long distances. The development of fluorescent pH probe materials has important scientific research value and practical significance. The current fluorescent pH probe materials mainly include organic fluorescent dyes, quantum dots and metal-organic framework materials. They have the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/7791G01N21/6428G01N2021/6432
Inventor 雷磊徐时清夏涵
Owner CHINA JILIANG UNIV
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