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Upconversion material and preparation method thereof

A conversion material, selected technology, applied in the direction of luminescent materials, chemical instruments and methods, etc.

Inactive Publication Date: 2012-07-04
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the types of up-conversion materials need to be increased

Method used

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  • Upconversion material and preparation method thereof
  • Upconversion material and preparation method thereof
  • Upconversion material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Blue upconversion material LiLa 0.77 (MoO 4 ) 2 :0.2Yb 3+ :0.03Tm 3+ Preparation: Weigh 0.753g (gram) La 2 O 3 ,, 0.236gYb 2 O 3 ,, 0.035gTm 2 O 3 ,Use concentrated nitric acid (concentration of concentrated nitric acid is 16mol / L, dosage is 2mL) to dissolve the rare earth ion solution; weigh 0.221gLi 2 CO 3 , 2.119g(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, dissolve in deionized water (20mL) to obtain a metal ion solution; mix the rare earth ion solution and the metal ion solution, stir for 5 minutes, add the dispersant polyethylene glycol 0.320g, the foaming agent citric acid 2.306g, continue The mixed solution is obtained after electromagnetic stirring for 5 minutes; the solution is poured into the crucible, covered and placed in a household microwave oven for 10 minutes; a lot of thick smoke is emitted during the reaction, and the sample in the crucible expands rapidly to form a gray precursor; The body is sintered in a muffle furnace at 600°C for 4 hours to obtain white powder, whi...

Embodiment 2

[0064] Blue upconversion material NaLa 0.77 (MoO 4 ) 2 :0.2Yb 3+ :0.03Tm 3+ Preparation: weigh 0.753g La 2 O 3 ,, 0.236gYb 2 O 3 ,, 0.035gTm 2 O 3 , Dissolve with concentrated nitric acid (concentration of concentrated nitric acid is 16mol / L, dosage is 2mL) to obtain rare earth ion solution; weigh 0.318gNa 2 CO 3 , 2.119g(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, dissolve in deionized water (20mL) to obtain a metal ion solution; mix the rare earth ion solution and the metal ion solution, stir for 5 minutes, add the dispersant polyethylene glycol 0.320g, the foaming agent citric acid 2.306g, continue The mixed solution is obtained after electromagnetic stirring for 5 minutes; the solution is poured into the crucible, covered and placed in a household microwave oven for 10 minutes; a lot of thick smoke is emitted during the reaction, and the sample in the crucible expands rapidly to form a gray precursor; The body is sintered in a muffle furnace at 600°C for 4 hours to obtain white powder, which...

Embodiment 3

[0066] Blue upconversion material KLa 0.77 (MoO 4 ) 2 :0.2Yb 3+ :0.03Tm 3+ Preparation: Weigh 0.753g La 2 O 3 ,, 0.236gYb 2 O 3 ,, 0.035gTm 2 O 3 , Dissolved with concentrated nitric acid (concentration of concentrated nitric acid is 16mol / L, dosage is 2mL) to obtain rare earth ion solution; weigh 0.414gK 2 CO 3 , 2.119g(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, dissolve in deionized water (20mL) to obtain a metal ion solution; mix the rare earth ion solution and the metal ion solution, stir for 5 minutes, add the dispersant polyethylene glycol 0.320g, the foaming agent citric acid 2.306g, continue The mixed solution is obtained after electromagnetic stirring for 5 minutes; the solution is poured into the crucible, covered and placed in a household microwave oven for 10 minutes; a lot of thick smoke is emitted during the reaction, and the sample in the crucible expands rapidly to form a gray precursor; The body is sintered in a muffle furnace at 600°C for 4 hours to obtain white powder, which ...

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Abstract

The invention provides an upconversion material and a preparation method thereof, comprising the following steps of: (a) dissolving La2O3, gamma b2O3 and Tm2O3 in the mol ratio of (1-x-y) / 2:x / 2:y / 2 with concentrated nitric acid to obtain rare-earth ion solution, wherein x is equal to 0.10-0.25 and y is equal to 0.01-0.05; (b) dissolving carbonate of alkali metal or nitrate of the alkali metal andammonium molybdate into water to obtain metal ion solution, wherein the alkali metal is one of Li, Na and K and the mol ratio of alkali metal elements to molybdenum element in the ammonium molybdate to Tm2O3 is 1:2:y / 2; (c) mixing the rare-earth ion solution obtained in the step (a) and the metal ion solution obtained in the step (b) and and stirring; (d) adding a dispersant and stirring; (e) adding a foaming agent and stirring; (f) heating to obtain an expanding precursor of the upconversion material; and (g) sintering the expanding precursor into powder.

Description

Technical field [0001] The invention relates to an up-conversion material and a preparation method thereof. Background technique [0002] Among the photoluminescent materials, the material that first absorbs long waves and then radiates short waves is called up-conversion material. The up-conversion phenomenon of this material is the anti-Stockes effect, that is, the radiated energy is greater than the absorbed energy. The up-conversion material is mainly a solid compound doped with rare earth elements. Using the metastable energy level characteristics of rare earth elements, it can absorb multiple low-energy long-wave radiation, and emit high-energy short-wave radiation after multiphoton addition, which can make it visible The invisible infrared light becomes visible light. This feature enables the function of infrared detectors with poor long-wave sensitivity to be further exerted. Therefore, up-conversion materials can be used as infrared light display materials such as nigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 孙家跃周威杜海燕蓝雨靖
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY