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A water-soluble high-efficiency rare earth luminescent material and its preparation method

A technology of rare earth luminescent and luminescent materials, applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve the effect of high efficiency, simple method, and enhanced fluorescence intensity

Active Publication Date: 2016-02-17
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to use a more environmentally friendly method to produce luminescent materials with higher efficiency and intensity in aqueous solution has always been a difficult problem

Method used

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  • A water-soluble high-efficiency rare earth luminescent material and its preparation method
  • A water-soluble high-efficiency rare earth luminescent material and its preparation method
  • A water-soluble high-efficiency rare earth luminescent material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Take 1g of laponite LAPONITERD in a 100ml flask, add 15ml of double distilled water to dissolve, ultrasonicate, and stir with a glass rod until it is in a transparent gel state (about 30min), then add 10ml of 0.1mol / LEuCl to it 3 ·6H 2 O ethanol solution, refluxed in an oil bath at 80°C for 24h. After centrifugation and drying, the ion-exchanged water-soluble gel-state nanoclay is obtained, which is designated as LA-Eu.

[0049] (2) Take 0.29g (1.308mmol,) α-thienoyltrifluoroacetone (TTA) in a 100ml flask (the molar number of Ln ions is excessive relative to TTA), add 10ml of absolute ethanol to dissolve, and then dissolve the condensate obtained in the previous step LA-Eu in the gel state was added to the flask, ultrasonicated, and then 6ml of absolute ethanol was added, reacted for 5 hours, centrifuged, and dried to obtain a water-soluble gel-state nanoclay containing luminescent rare earth organic ligands, which was designated as LA-EuTTA.

[0050] (3) Take the...

Embodiment 2

[0054] Steps (1) and (2) are the same as in Example 1, but the silanized ionic liquid II in steps (3) and (4) is changed to carboxylic acid ionic liquid VI, and other conditions remain unchanged, and finally water-soluble gel-state luminescence is obtained Material LA-EuTTA-VI. Under ultraviolet light, the luminescent material also exhibits a distinct bright red color. Compared with before modification with carboxylic acid ionic liquid, the luminescence lifetime is increased from 0.22ms to 0.50ms, the quantum efficiency is increased from 5.7% to 17.5%, and the fluorescence intensity at 612nm has also been greatly improved.

Embodiment 3

[0056] Steps (1) and (2) are the same as in Example 1, but the silanized ionic liquid II in steps (3) and (4) is changed to hydroxyl ionic liquid, and other conditions remain unchanged, and finally a water-soluble gel-state luminescent material LA is obtained. -EuTTA-VII. Under ultraviolet light, the luminescent material also exhibits a distinct bright red color. Compared with before modification with hydroxyl ionic liquid, the luminescence lifetime is increased from 0.22ms to 0.51ms, the quantum efficiency is increased from 5.7% to 18.3%, and the fluorescence intensity at 612nm has also been greatly improved.

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Abstract

The invention relates to a water-soluble high-efficiency rare-earth luminescent material and a preparation method of a transparent film made from the same. The water-soluble high-efficiency rare-earth luminescent material comprises LAPONITE RD nano-clay, ionic liquid and water, wherein the LAPONITE RD nano-clay contains a luminescent rare-earth organic complex; the ionic liquid contains oxygen; the mass ratio of the LAPONITE RD nano-clay which contains the luminescent rare-earth organic complex to the ionic liquid which contains the oxygen is 1:(1-3); the mass of the water accounts for 80%-85% of the rare-earth luminescent material; the average particle diameter of the LAPONITE RD nano-clay is 30 nanometers, and the mass percentage of rare-earth ions contained in the LAPONITE RD nano-clay is 6%-7.5%. The water-soluble high-efficiency rare-earth luminescent material disclosed by the invention takes a large amount of water as a medium, can not only increase the efficiency of luminous quantum, but also enhance the dissolution concentration of the rare-earth ions in an inorganic matrix and the luminescent property.

Description

technical field [0001] The invention belongs to the field of rare earth luminescent materials, relates to a luminescent material and a transparent film, in particular to a preparation method of a water-soluble high-efficiency rare earth luminescent material and a transparent film. technical background [0002] The complexes formed by the combination of rare earth elements and suitable organic ligands have the advantages of strong light-absorbing ability, rich fluorescent colors and high color purity. decomposition, leading to certain limitations in its application. Studies have shown that combining rare earth organic complexes with zeolite, clay and other substrates can effectively improve their light stability, thermal stability and mechanical stability. In addition, rare earth complexes often have poor water solubility, and their luminescence efficiency is often very low in aqueous solution due to the fluorescence quenching effect of water molecules, which also severely l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C03C17/00
Inventor 李焕荣杨大清王弋戈
Owner HEBEI UNIV OF TECH
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