Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof

A technology of rare earth phosphors and small particles, applied in chemical instruments and methods, applications, luminescent materials, etc., can solve problems that have not yet appeared, and achieve the effects of eliminating object background interference, simple fingerprint display technology, and high fluorescence intensity

Inactive Publication Date: 2009-10-28
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is no information on the small particle yellow rare earth phosphor Y 3-x-y Ce x Gd y al 5 o 12 Its preparation method and literature reports on its use in displaying latent handprints

Method used

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  • Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof
  • Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof
  • Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Press Y 3-x-y Ce x Gd y Al 5 o 12 The stoichiometric ratio of the metal elements in the medium (where x=0.2, y=0.2), that is, according to the ratio of the amount of the substance of Y:Ce:Gd:Al is 2.6:0.2:0.2:5, weigh Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 , and then weigh the equivalent Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 Total weight 2% BaF 2 As a flux, put the weighed reagent in an agate mortar and grind it for 20-60 minutes to make it evenly ground, mix it evenly, and put it into a corundum crucible;

[0037] (2) Put the corundum crucible with reagents into a high-temperature reduction furnace, sinter at 1400°C for 4 hours in a hydrogen reduction atmosphere (or reduction with carbon powder), and then take out the sample after cooling to room temperature with the furnace;

[0038] (3) Grinding the powder obtained by sintering and passing through a 300-mesh sieve to obtain the primary powder;

[0039] (4) Soak the primary powder in nitric a...

Embodiment 2

[0046] (1) Press Y 3-x-y Ce x Gd y Al 5 o 12 The stoichiometric ratio of the metal elements (wherein x=0.1, y=0.1), that is, according to the ratio of the amount of Y:Ce:Gd:Al is 2.8:0.1:0.1:5, weigh Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 , and then weigh the equivalent Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 Total weight 0.5% H 3 BO 3 As a flux, put the weighed reagent in an agate mortar and grind it for 20-60 minutes to make it evenly ground, mix it evenly, and put it into a corundum crucible;

[0047] (2) Put the corundum crucible with reagents into a high-temperature reduction furnace, sinter at 1500°C for 2 hours in a hydrogen reduction atmosphere (or reduction with carbon powder), and then take out the sample after cooling to room temperature with the furnace;

[0048] (3) Grinding the powder obtained by sintering and passing through a 360 mesh sieve to obtain the primary powder;

[0049] (4) Soak the primary powder in nitric acid with a mass percent...

Embodiment 3

[0055] (1) Press Y 3-x-y Ce x Gd y Al 5 o 12 The stoichiometric ratio of metal elements (wherein x=0.4, y=0.4), that is, according to the ratio of the amount of Y:Ce:Gd:Al is 2.2:0.4:0.4:5, weigh Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 , and then weigh the equivalent Al 2 o 3 , Y 2 o 3 , CeO 2 and Gd 2 o 3 Total weight 3% BaF 2 with H 3 BO 3 mixture (wherein BaF 2 with H 3 BO 3 Mass ratio is 1: 1~15) as fluxing agent, puts the weighed reagent in the agate mortar and grinds 20~60min to make it grind evenly, after it is mixed evenly, packs in the corundum crucible;

[0056] (2) Put the corundum crucible with reagents into a high-temperature reduction furnace, sinter at 1200°C for 5 hours under hydrogen reduction atmosphere (or reduction with carbon powder), and then take out the sample after cooling to room temperature with the furnace;

[0057] (3) Grinding the powder obtained by sintering and passing through a 360 mesh sieve to obtain the primary powder;...

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Abstract

The invention discloses small-particle yellow rare-earth fluorescent powder and a preparation method and a purpose of visualizing a latent fingerprint thereof. The general structure formula of the fluorescent powder is Y3-x-yCexGdyA15O12, wherein the x is not less than 0.1 and no larger than 0.4, y is no less than 0.1 and no larger than 0.4 and the particle size is between 1.5 to 3 Mum. The preparation method comprises the steps of weighing up raw materials according to the stoichiometric ratio of the structure formula, grinding and evenly mixing up the raw materials, sintering the raw materials with high-temperature solid-phase method to obtain powder and obtaining the small-particle yellow rare-earth fluorescent powder by adopting an ultrasonic dispersion technology after the powder goes through a mesh with 300 to 400 eyes. The small-particle yellow rare-earth fluorescent powder can be applied to visualizing the latent finger print after being amido-functionalized by gamma-Aminopropyl triethoxy silane and being mixed with reduced iron powder which goes through a mesh according to a certain ratio. The fluorescent powder provided by the invention has even and small particles, high fluorescent intensity, the excitation wave length between 460 to 480nm which is within the range of the light source commonly used in criminal investigation and the emission wave length between 520 to 570nm, is conducive to visualizing the latent finger print on the site and eliminating the disturbance of the object background and is important for establishing a high-efficient, non-toxic, lossless and convenient finger print visualizing method.

Description

technical field [0001] The invention relates to a small particle yellow rare earth fluorescent powder, a preparation method thereof and an application for displaying latent fingerprints, belonging to the field of material science and also the field of forensic science. Background technique [0002] As an important branch of forensic science, fingerprint display technology has developed into a science integrating physics, chemistry, biology and optics after hundreds of years of development. Although the fingerprint display technology is becoming more and more mature, there are still a series of problems to be solved. First of all, the visualization methods of many fingerprint samples with unsatisfactory objective conditions still need to be perfected; secondly, there are still potential safety hazards in the existing visualization reagents and visualization methods, such as the dust suspended in the air when the brush visualization method is adopted, and certain carcinogenic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80A61B5/117A61B5/1172
Inventor 袁曦明李柳熊晓波张剑王娟娟王峰谢安
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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