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Process for producing lanthanum cerium terbium oxide fluorescent powder

A technology of terbium oxide and phosphor, which is applied in the field of preparation of lanthanum cerium terbium oxide phosphor, can solve problems such as poor sphericity, and achieve the effect of improving fluorescence performance

Inactive Publication Date: 2008-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiency of poor sphericity in the prior art, the present invention provides a preparation method of lanthanum cerium terbium oxide phosphor, by changing the crystallization environment of co-precipitation to control the morphology of lanthanum cerium terbium oxalate, can prepare dispersed Good spherical polyhedral lanthanum cerium terbium oxide phosphor

Method used

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  • Process for producing lanthanum cerium terbium oxide fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, take by weighing 18.375g oxalic acid crystals and dissolve it in 70ml of distilled water, the oxalic acid crystals are H 2 C 2 o 4 1.5H 2 O purity is above 98%. Measure 60ml of lanthanum, cerium and terbium chloride solution. The characteristic of the lanthanum, cerium and terbium chloride solution is that the density is 250g / L. After converting the chloride into an oxide, La 2 o 3 , CeO 2 , Tb 4 o 7 The mass percentages are 60%, 23.75%, and 16.25%, respectively, and the hydrogen ion concentration is 0.03mol / L. Add 60ml of distilled water into a 500ml reaction bottle and heat it with a water bath. When the temperature rises to 60°C, add 0.24 grams of Tween-20 and 4.5 ml of self-made additives and 15 ml of concentrated hydrochloric acid. The home-made additives are polyacrylate non-ionic surface additives with a solid content of about 10% made in the laboratory. agent. Start stirring, and when the system is homogeneous, use two constant pressure d...

Embodiment 2

[0020] Embodiment 2, take by weighing 6.125g oxalic acid crystal and dissolve it in 35ml of distilled water, the oxalic acid crystal is H 2 C 2 o 4 1.5H 2 O purity is above 98%. Measure 20ml of lanthanum cerium terbium chloride solution, the characteristics of lanthanum cerium terbium chloride are the same as in Example 1. Add 40ml of distilled water into a 250ml reaction bottle and heat it with a water bath. When the temperature rises to 80°C, add 0.4 g of OP-10 and 6 ml of acrylic acid, start stirring, and when the system is homogeneous, add dropwise oxalic acid solution and lanthanum cerium terbium solution at the same time. After the addition, the mixture was aged for about 1.5 hours under the condition of continuous stirring, and then cooled to room temperature. The resulting precipitate was filtered, washed, and dried at 90°C. Put the lanthanum cerium terbium oxalate obtained at this time into a box-type resistance furnace, rapidly raise the temperature to 980° C.,...

Embodiment 3

[0022] Embodiment 3, take by weighing 18.375g oxalic acid crystals and dissolve it in 60ml of distilled water, the oxalic acid crystals are H 2 C 2 o 4 1.5H 2 O purity is above 98%. Measure 60ml of lanthanum cerium terbium chloride solution, the characteristics of lanthanum cerium terbium chloride are the same as in Example 1. Add 20ml of distilled water and 45ml of absolute ethanol into a 500ml reaction bottle, and heat it with a water bath. When the temperature rises to 40°C, add 9ml of self-made additives—the homemade additives are polyacrylate non-ionic surface additives made in the laboratory with a solid content of about 10%, then add 12ml of concentrated hydrochloric acid, and start stirring. When the system is homogeneous, add the oxalic acid solution and the lanthanum cerium terbium solution dropwise at the same time. After the addition, the mixture was aged for 2 hours under the condition of continuous stirring, and then cooled to room temperature. The resultin...

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Abstract

The invention discloses a preparation method for phosphor powder of lanthanum, cerium, and terbium oxide, and is characterized in that the invention includes the following steps: confecting oxalic acid solution and taking the solution of lanthanum, cerium, and terbium oxide according to the proportion that the ratio of the mass of oxalic acid crystal to the mass of lanthanum, cerium, and terbium oxide equals to 1.2 to 1; adding distilled water or the composite liquid of the distilled water and ethanol into a reaction bottle is heated up to the preset value of 40 to 80 DEG C, and adding a surface additive and then adding acid to the reaction bottle to be stirred in the bottle; using two constant-pressure droppers respectively to add the solution of lanthanum, cerium, and terbium oxide and the oxalic acid solution with the mass proportion at the same time, and the solution of lanthanum, cerium, and terbium oxide and the oxalic acid solution can be dropped at the same time, and then stirring and ageing are went on to carry out; the sediment is separated from the mother liquid, and sucking filtration, washing and drying are carried out after the sediment mother liquid is cleared and cooled to the room temperature; putting the drying matter onto a resistance furnace and the temperature quickly raises to 920 to 980 DEG C and cooling the drying matter after the temperature is kept for 3 to 4 hours. As the surface additive and the acid are added in the crystal reaction process, the lanthanum, cerium, and terbium oxide in polyhedron that is similar to the sphericity is finally obtained.

Description

technical field [0001] The invention relates to a preparation method of lanthanum cerium terbium oxide fluorescent powder, in particular to a preparation method of spherical polyhedral lanthanum cerium terbium oxide fluorescent powder. Background technique [0002] Lanthanum cerium terbium oxide is a fluorescent material that emits green light, and is mainly used in the manufacture of rare earth phosphors for lamps. For phosphors, more and more studies have shown that the morphology of phosphors has a great influence on its luminous intensity, luminous efficiency and resolution. Spherical phosphor particles have a large specific surface area, so they are most likely to absorb external excitation light. At the same time, spherical particles can obtain a large packing density, and have the strongest emission effect on the light emitted by themselves in all directions, so that The light scattering of the phosphor can be reduced, so compared with other shapes, the spherical pho...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 张秋禹陆树新张和鹏马明亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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