Method for preparing spherical CaAl2O4:Eu,Nd luminescent powder

A luminescent powder and spherical technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of coarse particles, difficult to prepare, reduce the luminous brightness of products, etc., and achieve the effect of improving application characteristics and good dispersibility.

Inactive Publication Date: 2018-01-19
中铝山东有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particles of the product produced by the high-temperature solid-phase method are coarse and require ball milling, which will greatly reduce the luminous brightness of the product; in addition, it is difficult to prepare spherical calcium aluminate-based long-lasting luminescent powder by the solid-phase method

Method used

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  • Method for preparing spherical CaAl2O4:Eu,Nd luminescent powder
  • Method for preparing spherical CaAl2O4:Eu,Nd luminescent powder

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preparation example Construction

[0032] The preparation process of the embodiment of the present invention is stable, easy to control, and can realize industrial application. The spherical CaAl prepared in the embodiment of the present invention 2 o 4 :Eu, Nd long-lasting luminescent powder can be uniformly dispersed in the medium when used as an additive, or coated on the surface of the device to achieve uniform coating and better performance. The spherical shape can reduce light scattering, improve luminous efficiency, and realize uniform coating and high-density accumulation of powder on the device.

[0033] In order to make the above-mentioned and other purposes, features, and advantages of the present invention more clearly understandable, the following special examples are given to illustrate the preparation of spherical CaAl described in the present invention. 2 o 4 : Eu, Nd luminescent powder method.

Embodiment 1

[0035] The embodiment of the present invention prepares spherical CaAl 2 o 4 : Eu, the method for Nd luminescent powder, comprises the steps:

[0036] a. heating and dissolving 4N grade aluminum hydroxide with commercially available high-purity nitric acid (mass fraction is 68%), obtains clear aluminum salt solution after filtering; Wherein, [Al 3+ ] concentration is 0.2mol / L; the above-mentioned 4N grade aluminum hydroxide requires the addition of Al(OH) 3 In addition, the content of other impurity elements is less than 0.01%.

[0037] b. Dissolve calcium nitrate, europium nitrate, and neodymium nitrate respectively with deionized water, filter after dissolving, and prepare to contain Ca 2 + 、Eu 3+ 、Nd 3+ mixed salt solution; where [Ca 2+ ] concentration is 0.094mol / L, [Eu 3+ ] concentration is 0.002mol / L, [Nd 3+ ] The concentration is 0.004mol / L.

[0038] c. Dissolve ammonium carbonate with deionized water, filter after dissolving to obtain (NH 4 ) 2 CO 3 soluti...

Embodiment 2

[0047] The embodiment of the present invention prepares spherical CaAl 2 o 4 : Eu, the method for Nd luminescent powder, comprises the steps:

[0048] a. heating and dissolving 4N grade boehmite with commercially available high-purity nitric acid (mass fraction is 65%), and obtaining a clear aluminum salt solution after filtration; wherein, [Al 3+ ] at a concentration of 0.4mol / L; the above-mentioned 4N grade boehmite requires that the content of other impurity elements be less than 0.01% except for γ-AlOOH.

[0049] b. Dissolve calcium nitrate, europium nitrate, and neodymium nitrate respectively with deionized water, filter after dissolving, and prepare to contain Ca 2 + 、Eu 3+ 、Nd 3+ mixed salt solution; where [Ca 2+ ] concentration is 0.188mol / L, [Eu 3+ ] concentration is 0.004mol / L, [Nd 3+ ] The concentration is 0.008mol / L.

[0050] c. Dissolve ammonium carbonate with deionized water, filter after dissolving to obtain (NH 4 ) 2 CO 3 solution, where (NH 4 ) 2...

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Abstract

The invention provides a method for preparing spherical CaAl2O4:Eu,Nd luminescent powder. The method comprises the steps of: preparing an aluminum salt solution which contains Al<3+>, preparing a mixed salt solution which contains Ca<2+>, Eu<3+> and Nd<3+>, mixing an ammonium carbonate salt solution with the aluminum salt solution and the mixed salt solution in a state of stirring to form a reaction system, and performing a reaction at 15-65 DEG C for 10-20 hours to obtain a precipitate; washing the precipitate, drying the washed precipitate, calcining the dried precipitate in a carbon reduction atmosphere at 1250-1450 DEG C for 2-6 hours, and cooling calcined products to obtain the spherical CaAl2O4:Eu,Nd long-lasting luminescent powder. The long-lasting luminescent powder prepared by themethod has purity of 99.99% or above, spherical morphology and good dispersibility, the problems that an existing long-lasting luminescent material has poor fluidity and uneven dispersion in a mediumare solved, and the application characteristics of the long-lasting luminescent material can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of aluminate material preparation, in particular to a method for preparing spherical CaAl 2 o 4 : Eu, Nd luminescent powder method. Background technique [0002] Calcium aluminate (CaAl 2 o 4 : Eu, Nd) long afterglow luminescent materials are widely used in daily consumer goods such as clothing, clocks, switches, signs, toys, handicrafts, stationery and sporting goods, and have been widely used in the fields of architectural decoration, transportation, military facilities and fire emergency systems. widely used. CaAl 2 o 4 :Eu, Nd luminescent powder needs to be used as an additive to make various products or coated on various devices before it can be applied, which requires the powder to have the following properties: uniform particle size, no agglomeration, and regular shape. The particle size is uniform and does not agglomerate, so that the powder is uniformly dispersed when used as an additive. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 杜善国杨丛林周波王立家孙兴波李广战姚毅
Owner 中铝山东有限公司
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