Monocline type gadolinium aluminate based fluorescent powder and method for making same

A gadolinium aluminate-based, phosphor technology is applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of high color purity, high luminous intensity, and uniform particle size distribution

Inactive Publication Date: 2005-09-21
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a new material, there is no direct research on the preparation technology of GAM powder. J.W.M.Verweij and others are using solid reaction method to synthesize GAP

Method used

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  • Monocline type gadolinium aluminate based fluorescent powder and method for making same
  • Monocline type gadolinium aluminate based fluorescent powder and method for making same
  • Monocline type gadolinium aluminate based fluorescent powder and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Take 7.5g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 7.327g gadolinium oxide (Gd 2 o 3 ), 0.1408g europium oxide (Eu 2 o 3 ), 25.05g citric acid, and a sufficient amount of concentrated nitric acid were dissolved in deionized water, stirred to form a uniform solution and adjusted to a pH value of 7. The beaker containing the solution was placed on a magnetic stirrer, heated to 70°C and kept stirring, and a sol was formed after several hours. Continue stirring and heating until a clear gel forms. Put the gel into a box furnace and heat it to 400 °C to form a gray-black precursor powder. The precursor powder is then calcined at 950°C for 1.5 hours to obtain Gd 4 Al 2 o 9 :Eu(5%molGd) pale pink final product. figure 1 for Gd 4 Al 2 o 9 :Eu 3+ Fluorescence spectra of nanopowders excited by ultraviolet light, indicating that the luminescent ion Eu 3+ It enters the GAM lattice in the form of solid solution, and emits red fluorescence under the excitation of ultrav...

Embodiment 2

[0018] Take 7.5g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 7.327g gadolinium oxide (Gd 2 o 3 ), 0.1355g praseodymium oxide (Pr 6 o 11 ), 27g citric acid, and a sufficient amount of concentrated nitric acid were dissolved in deionized water, stirred to form a uniform solution and adjusted to a pH of 3. The beaker containing the solution was placed on a magnetic stirrer, heated to 75°C and kept stirring, and a sol was formed after several hours. Continue stirring to form a transparent gel. Put the gel into a box furnace and heat it to 450°C to form a gray-black precursor powder, which is calcined at 1300°C for 2 hours to finally obtain Gd 4 Al 2 o 9 :Pr(5%molGd) pale pink final product. figure 2 for Gd 4 Al 2 o 9 :Pr 3+ The fluorescence spectrum of the nanopowder under ultraviolet light excitation shows that the luminescent ion Pr enters the GAM lattice in the form of solid solution, and emits red fluorescence under the excitation of ultraviolet light (254nm).

Embodiment 3

[0020] Take 7.5g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 7.327g gadolinium oxide (Gd 2 o 3 ), 0.1408g europium oxide (Eu 2 o 3 ), 0.0137g cerium oxide (CeO 2 ), 13g citric acid, and a sufficient amount of concentrated nitric acid were dissolved in deionized water, stirred to form a uniform solution and adjusted to a pH of 5. The beaker containing the solution was placed on a magnetic stirrer, heated to 80°C and kept stirring, and a sol was formed after several hours. Continue stirring to form a transparent gel. Put the gel into a box furnace and heat it to 450°C to form a gray-black precursor powder, which is calcined at 1200°C for 1.5 hours to finally obtain Gd 3 Al 5 o 12 :Eu, Ce light pink final product. image 3 for Gd 4 Al 2 o 9 : Fluorescence spectra of Eu, Ce nanopowders excited by ultraviolet light.

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Abstract

The invention relates to a monocline gadolinium aluminate based fluorescent powder and method for preparation, wherein the fluorescent powder has the chemical expression formula of Gd4(1-x)A12O9:Rex or Gd4A12(1-x)O9:Rex, wherein RE is rare-earth element such as Eu, Pr, Ce, Tb, RE can be one or more of rare-earth elements, X is doping gram molecular weight, 0.001 C09K 11/80 1 3 1 2005/4/27 1670125 2005/9/21 100343360 2007/10/17 2007/10/17 2007/10/17 Nanchang University Jiangxi 330047 Luo Lan Zhou Lang Wei Xiuqin

Description

technical field [0001] The invention belongs to the field of luminescent powder preparation, and particularly relates to a rare earth-activated monoclinic gadolinium aluminate-based fluorescent powder and a preparation method. Background technique [0002] Monoclinic gadolinium aluminate (Gd 4 Al 2 o 9 , referred to as GAM) has excellent optical properties, mechanical properties and stable physical and chemical properties, and its application as a new type of optical matrix material is attracting people's attention. GAM belongs to the monoclinic crystal system, has an ideal distribution coefficient for dopants and a large absorption coefficient, and its crystal is an ideal optical matrix material. Powders doped with other ions (mainly rare earth element ions and transition metal ions) in GAM emit visible light under the excitation of ultraviolet and vacuum ultraviolet light, X-rays and high-energy particles, and are expected to be used in cathode ray tubes (CRT), field em...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 罗岚周浪魏秀琴
Owner NANCHANG UNIV
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