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Phosphate upconversion luminescent nanocrystalline capable of emitting red light or green light and method of producing the same

A nanocrystalline, red light-emitting technology, applied in luminescent materials, chemical instruments and methods, single crystal growth, etc., can solve the problems of inorganic nanocrystalline particle agglomeration, no luminescence performance, high surface energy of nanoparticles, and meet equipment requirements Low, easy to mass-produce, the effect of simple preparation process

Inactive Publication Date: 2009-04-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although inorganic nanocrystals can be obtained by many wet chemical methods such as combustion method and precipitation method, the inorganic nanocrystal particles prepared by these methods are seriously agglomerated, because these methods still require high temperature sintering, and the surface energy of nanoparticles is high. Unavoidable agglomeration occurs during sintering
After investigating the literature, we did not find any information about the rare earth ion Tb 3+ with Eu 3+ Research and Report on the Luminescent Properties of Phosphate Upconversion Luminescent Nanocrystals

Method used

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  • Phosphate upconversion luminescent nanocrystalline capable of emitting red light or green light and method of producing the same
  • Phosphate upconversion luminescent nanocrystalline capable of emitting red light or green light and method of producing the same

Examples

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example 1

[0019] The rare earth nitrate Gd(NO 3 ) 3 , Yb(NO 3 ) 3 , Tb(NO 3 ) 3 with ammonium hydrogen phosphate NH 4 HPO 4 Soluble in water to form an aqueous solution, and in the molar ratio (1-x-y)Gd 3+ :xTb 3+ :yYb 3+ : 1[PO 4 ] 3- (where x=0.001, y=0.5) Mix well. 0.5mol / L NaOH solution was added dropwise, and the pH of the solution remained at 5 after thorough stirring. Hydrothermal reaction at 220°C for 12 hours. After the reaction, cool naturally, filter with suction, wash with distilled water three times, and dry naturally to obtain the product. The particle size of the product is about 30-50nm, and it can form a stable suspension in aqueous solution. Under the pumping of 30mw 980nm laser, the material can emit uniform upconversion green light. The up-conversion luminescence spectrum is attached as figure 1 As shown, the green region is roughly composed of six emission peaks, corresponding to Tb 3+ A photon emitted from a high energy state back to the ground stat...

example 2

[0021] The rare earth nitrate Gd(NO 3 ) 3 , Yb(NO 3 ) 3 , Eu(NO 3 ) 3 with ammonium hydrogen phosphate NH 4 HPO 4 Soluble in water to form an aqueous solution, and in the molar ratio (1-x-y)Gd 3+ :xEu 3+ :yYb 3+ : 1[PO 4 ] 3- (where x=0.005, y=0.05) Mix well. 1.0mol / L NaOH solution was added dropwise, and the pH of the solution was maintained at 6 after thorough stirring. Hydrothermal reaction at 180°C for 24 hours. After the reaction, cool naturally, filter with suction, wash with distilled water three times, and dry naturally to obtain the product. The particle size of the product is about 30-50nm, and it can form a stable suspension in aqueous solution. Under the pumping of 30mw 980nm laser, the material can emit uniform upconversion red light.

example 3

[0023] Rare earth nitrate Y(NO 3 ) 3 , Yb(NO 3 ) 3 , Tb(NO 3 ) 3 with ammonium hydrogen phosphate NH 4 HPO 4 Soluble in water to form an aqueous solution, and in the molar ratio (1-x-y)Y 3+ :xTb 3+ :yYb 3+ : 1[PO 4 ] 3- (where x=0.01, y=0.8) Mix well. 2.0mol / L NaOH solution was added dropwise and the pH of the solution was maintained at 9 after thorough stirring. Hydrothermal reaction at 280°C for 18 hours. After the reaction, cool naturally, filter with suction, wash with distilled water three times, and dry naturally to obtain the product. The particle size of the product is about 30-50nm, and it can form a stable suspension in aqueous solution. Under the pumping of 30mw 980nm laser, the material can emit uniform upconversion green light.

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Abstract

The invention discloses a phosphate up-conversion luminescence nano-crystalline which can give out red lights or green lights as well as a preparation method thereof. The chemical composition formula thereof is RE1-x-yPO4: xLn, yYb; wherein, RE is equal to Y, La or Gd, Ln is equal to Eu or Tb, x is equal to 0.001 to 0.01 and y is equal to 0.05 to 0.8. According to the chemical measurement ratio of a target product, amine hydrogen phosphate is added into the rare earth nitrate liquid of the material; the pH value of the liquid is improved to be between 6 and 8 by the NaOH of 2mol.L<-1>; then the liquid is transferred into a closed stainless steel reaction kettle; a water heating method is used for preserving the temperature for 10 to 24 hours at the temperature between 180 and 280 DEG C for composing the phosphate up-conversion luminescence nano-crystalline in the invention by one step. The nano-crystalline has uniform grains, good dispersing performance and gives out red lights or green lights under the laser pumping of 980nm. The preparation method has the advantages of low composing temperature, short production period and simple technique steps.

Description

technical field [0001] The invention relates to a rare earth luminescent material, in particular to a phosphate up-conversion luminescent nanocrystal capable of emitting red or green light and a preparation method thereof. Background technique [0002] Rare earth ions absorb multiple infrared photons and emit one visible photon through an up-conversion process. Yb 3+ Ions are often used as sensitizer ions because they have only two energy levels, no cross-relaxation, and can effectively absorb 980nm infrared light. Up-conversion luminescent nanocrystals are considered to be a good biological calibration material, which can track and determine biomolecules such as DNA, RNA, and protein, and can be used in medical fields such as immunity, diagnosis, and treatment (relevant literature: Nano lett.2004, 4, 2191; Adv. Mater. 2005, 17, 2119). Traditional biological calibration materials use organic dyes, and require ultraviolet light as the excitation light source, and biomolecu...

Claims

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Application Information

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IPC IPC(8): C09K11/81C30B29/14C30B7/10
Inventor 潘跃晓
Owner SOUTH CHINA UNIV OF TECH