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A near-infrared region mechanoluminescence phosphor and preparation method thereof

A near-infrared region, electroluminescence technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problem that luminescent phosphors are not reported and limited to ultraviolet light, blue light, green light to red light, etc., and achieve the preparation process. Simple, low cost, easy to mass-produce

Active Publication Date: 2019-06-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanoluminescence bands discovered so far are only limited to the visible light bands from ultraviolet light, blue light, green light to red light.
Near-infrared emitting mechanoluminescent phosphors have not been reported for a long time

Method used

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  • A near-infrared region mechanoluminescence phosphor and preparation method thereof
  • A near-infrared region mechanoluminescence phosphor and preparation method thereof
  • A near-infrared region mechanoluminescence phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Choose calcium carbonate, zinc sulfide, and neodymium oxide as raw materials, according to the molar ratio of each element Ca:Zn:S:Nd=1-x:1:1:x, respectively weigh three kinds of compound raw materials, a total of five groups, for example Down:

[0034] (1) Ca:Zn:S:Nd=0.999:1:1:0.001, corresponding to x=0.10%;

[0035] (2) Ca:Zn:S:Nd=0.998:1:1:0.002, corresponding to x=0.20%;

[0036] (3) Ca:Zn:S:Nd=0.997:1:1:0.003, corresponding to x=0.30%;

[0037] (4) Ca:Zn:S:Nd=0.995:1:1:0.005, corresponding to x=0.50%;

[0038] (5) Ca:Zn:S:Nd=0.990:1:1:0.010, corresponding to x=1.00%;

[0039] Control the total weight of the mixture to be 5g, grind 5g of mixed raw materials evenly, put them into a corundum crucible, then place the crucible in a corundum boat, push the corundum boat into a tube furnace, and roast at 1100°C for 3 hours under a nitrogen atmosphere. Cool naturally with the furnace to get a series of near-infrared mechanoluminescent phosphors with doping concentrati...

Embodiment 2

[0045] Select calcium oxide, zinc sulfide and neodymium nitrate as raw materials, weigh a certain amount of the above raw materials according to the molar ratio Ca:Zn:S:Nd=0.995:1:1:0.005, and after the raw materials are ground and mixed, take a part and add PVA Carry out granulation, take 5g of the raw material after granulation and carry out tabletting, adopt semi-automatic tabletting machine to keep 2min under 10Mpa, obtain the cylindrical flake of 25 * 10mm. The flakes were placed in a corundum boat and baked at 1100°C for 4 hours in a vacuum atmosphere; powder X-ray diffraction analysis showed that it was a CaZnOS crystal phase.

[0046] Calcined CaZnOS:0.5%Nd 3+ The sample is fixed on the sample stage, rubbed with a corundum rod with a sharp tip, and a spectrometer is used to collect the luminescent signal of the sample under friction excitation. Keep the distance between the rubbing tip and the fiber optic probe at 8mm. When performing triboluminescence experiments in...

Embodiment 3

[0048] Select calcium hydroxide, zinc sulfide, and neodymium hydroxide as raw materials, and weigh a certain amount of the above raw materials according to the molar ratio Ca:Zn:S:Nd=0.995:1:1:0.005. After the raw materials are ground and mixed, take an appropriate amount into a corundum crucible, then place the crucible in a corundum boat, push the corundum boat into a tube furnace, bake at 1000 ° C for 8 hours in an argon atmosphere, and cool naturally with the furnace. The obtained sample can be ground evenly to obtain near-infrared region mechanoluminescent phosphor CaZnOS:0.5%Nd 3+ . The obtained phosphor powder and transparent epoxy resin were mixed evenly at a mass ratio of 5:1, and cured at room temperature for 8 hours to obtain a cylindrical phosphor resin composite material with a size of 25×15 mm. The WEW-600 microcomputer-controlled universal testing machine was used to carry out the pressure luminescence test, and the pressure range was controlled from 0N to 5000...

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Abstract

Disclosed is a near-infrared mechanoluminescence fluorescent powder of the expression general formula Ca(1-x)ZnOS:xNd3+, x being greater than or equal to 0.05% and less than or equal to 1.0%. Further disclosed is a preparation method for said near-infrared mechanoluminescence fluorescent powder, the method comprising: (1) respectively weighing, according to the molar ratio of each element, a calcium-containing compound, a sulfur-containing compound, a zinc-containing compound, and a neodymium-containing compound as raw materials; (2) uniformly grinding the raw materials weighed in step (1), and then calcinating the resultant in a protective gas atmosphere or under vacuum; and (3) removing the calcinated sample, and grinding same so as to obtain the near-infrared mechanoluminescence fluorescent powder. The fluorescent powder of the present invention has a mechanoluminescence peak in the near-infrared region of 900 to 1400 nm under a frictional force and a pressure. Near-infrared luminescence can also be effectively excited by ultraviolet light, yellow light of 500 to 550nm, orange-red light of near 600 nm, and 808-nm laser.

Description

technical field [0001] The invention relates to luminescent materials, in particular to a near-infrared mechanoluminescent fluorescent powder and a preparation method thereof. Background technique [0002] Luminescence is a process in which an object absorbs energy in a certain way and converts it into non-equilibrium radiation. Luminescence can be excited in many ways, such as photoluminescence excited by ultraviolet light, cathodoluminescence excited by electron beams, and electric excitation. electroluminescence, thermally excited thermoluminescence, etc. However, there are relatively few studies on mechanoluminescence, that is, the luminescence phenomenon of materials under the action of mechanical external forces. With continuous exploration for more than 20 years, researchers have discovered and prepared a variety of phosphors with mechanoluminescent properties. It has the advantages of low cost, stable luminous performance, and proportional luminous intensity to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/77
CPCC09K11/7756
Inventor 彭明营李乐京
Owner SOUTH CHINA UNIV OF TECH
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