Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof

A luminescent material, fluorescence sensing technology, applied in luminescent materials, material analysis by optical means, material analysis, etc., to achieve good solubility and stability, improve luminous efficiency and thermal stability, and reduce application costs.

Pending Publication Date: 2021-12-17
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Europium complexes have been used as fluorescent materials for a lon

Method used

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  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof
  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof
  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Rare earth complex luminescent materials Eu (TPM) 3 Preparation of (PBO), the following steps can be implemented:

[0043] 1. Weigh 0.180g / 0.4mmol europium nitrate were dissolved 5mL acetonitrile, 5min was completely dissolved with stirring to give a colorless solution A;

[0044] 2. Weigh 0.2352g / 1.2mmol potassium hydroxide TPM and 0.0820g / 1.2mmol mixture was dissolved in a mixed solvent of acetonitrile and 1mL 5mL water, sufficiently stirred to obtain a colorless transparent solution B 5min;

[0045] 3. Weigh 0.078g / 0.4mmol of 2-PBO dissolved in 5mL of acetonitrile was stirred for 15min, to give a pale yellow solution C;

[0046] 4. Add B to A and a white precipitate formed, was stirred sufficiently, no significant changes in C was added and the solution mixed solution, stirred sufficiently to give a pale yellow turbid solution;

[0047] 5. filtered to give a pale yellow filtrate and the precipitate, the filtrate was bright red hair, and the fil...

Example Embodiment

[0048] Example 2

[0049] Rare earth complex luminescent materials Eu (TPM) 3 Preparation of (PBO) single crystal, the following steps can be implemented:

[0050] 1. Weigh synthesized by the procedure of Example 1 to give 0.020 g powder;

[0051] 2. The powder was dissolved in 10ml of dichloromethane, dissolved with stirring at room temperature until clear, then filtered;

[0052] 3. The resulting pale filtered filtrate placed in a clean test tubes are placed in advance in deionized water as precipitating agent in the lower layer, semi-hermetic crystallized on standing;

[0053] 4. A few days later, a large number of light-colored crystals grown in vitro, selection of the crystal size of crystals taken 0.49mm × 0.35mm × 0.20mm is X- ray diffraction test, the parsed Eu (TPM) 3 (PBO) crystal structure. The crystal structure of FIG. figure 1 and figure 2 Indicated.

Example Embodiment

[0054] Example 3

[0055] Rare earth complex luminescent materials Eu (TPM) 3 Preparation of (PBO) a paper-based fluorescent film: weighing 0.0020g of Eu (TPM) 3 (A PBO); 6ml of dichloromethane was added, sufficiently stirred sufficiently to dissolve completely to give a light colored clear solution; the complex solution was added slowly into a solution of PMMA in methylene chloride, the solution is clear and transparent light. Was added and the solution was prepared beforehand finely sprayed test strip, made sensitive to fluorescence sensing surface, and dried to give a ratio of waiting fluorescent paper (paper based fluorescent film); sensing the paper base phosphor film ammonia the very sensitive response to the gas, i.e., fluorescence quenching occurs when small amounts of ammonia present in the environment.

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Abstract

The invention discloses a novel rare earth ternary complex luminescent material, the molecular formula of the complex is Eu(TPM)3(PBO), and in the formula, TPM is 1, 1, 1-trifluoro-5, 5-dimethyl-2, 4-hexanedione; and PBO in the formula is a neutral heterocyclic ligand 2-(2-pyridine) benzoxazole. The compound is prepared by carrying out coordination reaction on europium nitrate, three times equivalent of TPM and one time equivalent of PBO ligand. The luminescent material disclosed by the invention is very good in luminescent property; the luminescent material has selective response to ammonia gas and high sensitivity, and quickly shows the sensing response characteristic of fluorescence quenching after being placed in an ammonia gas-containing atmosphere; and the material has good solubility and stability, can be easily prepared into a paper-based or quartz glass sheet-based fluorescence sensing film, the film also rapidly shows fluorescence quenching response which can be observed by naked eyes in an ammonia gas-containing atmosphere, and shows fluorescence sensing performance of rapid response and sensitive identification, and test paper can be flexibly manufactured into various required specifications, and can be used as a portable fluorescence sensing test paper device for ammonia gas detection.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to the application field of fluorescence sensing of luminescent materials. Background technique [0002] Due to their unique f electron layer structure, rare earth ions have the characteristics of long fluorescence lifetime, high quantum yield, narrow emission band and large Stokes shift, etc. It is a fluorescent sensor and a fluorescent probe used in biological systems and biomedical fields and has broad application prospects. [0003] At present, the problem of ammonia pollution in various environments cannot be ignored. As a colorless gas with a strong pungent odor, ammonia is lighter than air (specific gravity is 0.5), and the lowest detectable concentration is 5.3ppm. Ammonia is an alkaline substance that has corrosive and irritating effects on the skin tissues that it contacts. After being inhaled into the lungs, ammonia gas easily enters the blood ...

Claims

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Application Information

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IPC IPC(8): C07F5/00C09K11/06G01N21/64C08J5/18C08L33/12C08K5/00
CPCC07F5/003C09K11/06G01N21/643C08J5/18C07B2200/13C09K2211/182G01N2021/6432C08J2333/12C08K5/0091
Inventor 柴文祥王友裕宋莉
Owner CHINA JILIANG UNIV
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