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Method for synthesizing small-granularity narrow-distribution green fluorescent precursor

A green phosphor, narrow distribution technology, used in chemical instruments and methods, luminescent materials, etc., can solve the problem of limited adjustment of particle size distribution, and achieve the effects of product improvement, cost saving, and easy control of composition and particle size.

Inactive Publication Date: 2014-02-12
GUANGZHOU ZHUJIANG PHOTOELECTRIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the composition, central particle size, and particle size distribution of the lanthanum cerium terbium phosphate precursor have been determined, the adjustment of the composition, central particle size range, and particle size distribution of LAP green phosphors through sintering, ball milling and other processes is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: first mix the mixed oxides of lanthanum oxide, cerium oxide, and terbium oxide, ammonium dihydrogen phosphate, lithium tetraborate, and aluminum oxide with a D50 of 2.0-4.5 μm in a mass ratio of 1: 1.05: 0.04: 0.05. , put it into the sintering furnace, control the maximum temperature of the sintering furnace to 1200 ° C, under the condition of nitrogen protection atmosphere, the hydrogen content is 7.5%, the oxygen content is less than 30PPM, the maximum temperature holding time is 80 minutes, and the sintered body is sintered The D50 is 3.5-6.5 μm. After treatment, the D50 of the final LAP green phosphor is 3.0-5.5 μm, and the content rate of 1 μm to 10 μm is 95%.

Embodiment 2

[0008] Example 2: First, the D50 is 2.0-4.5 μm mixed oxide of lanthanum oxide, cerium oxide, terbium oxide, ammonium dihydrogen phosphate, boric acid, lithium tetraborate, aluminum oxide according to the mass ratio of substances 1: 1.1: 0.05: 0.06 : 0.08 Mix it well, put it into the sintering furnace, control the maximum temperature of the sintering furnace to 1160°C, under the condition of nitrogen protection atmosphere, the hydrogen content is 7.5%, the oxygen content is less than 30PPM, the maximum temperature holding time is 80 minutes, and sintering The D50 of the sintered body is 3.0-4.5 μm. After treatment, the content of 2.5-4.5 μm and 1 μm-8 μm of the final LAP green phosphor is 95%.

Embodiment 3

[0009] Example 3: First, the D50 is 2.0-3.5 μm mixed oxides of lanthanum oxide, cerium oxide, terbium oxide, ammonium dihydrogen phosphate, boric acid, lithium tetraborate, and aluminum oxide according to the mass ratio of substances 1: 1.15: 0.1: 0.06 : 0.15 Mix it well, put it into the sintering furnace, control the maximum temperature of the sintering furnace to 1100°C, under the condition of nitrogen protection atmosphere, the hydrogen content is 7.5%, the oxygen content is less than 30PPM, the maximum temperature holding time is 60 minutes, and sintering The D50 of the sintered body is 2.5-4.0 μm. After treatment, the content of 2.0-3.5 μm and 1 μm-8 μm of the final LAP green phosphor is 95%.

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Abstract

The invention discloses a method for synthesizing small-granularity narrow-distribution green fluorescent precursor. The method comprises the following steps: mixing the following raw materials in parts by mass: 1 part of lanthanum cerium terbium mixed rare earth oxide, 1.05-1.2 parts of diammonium hydrogen phosphate, 0-0.15 parts of boric acid, 0.01-0.1 parts of lithium tetraborate and 0.01-0.2 parts of aluminum oxide and then feeding the mixture into a firing furnace; introducing hydrogen and nitrogen; controlling the hydrogen content to be 2-10 percent, the oxygen content to be less than 30 PPM, the maximum temperature to be 1,050-1,250 DEG C and the time to be 30-120 minutes; sintering to obtain the small-granularity narrow-distribution LAP (Lanthanum Phosphate) green fluorescent powder precursor. According to the method, the rare earth oxide is used as the raw material, so that the production cost is reduced; by adjusting the proportion of lanthanum oxide, cerium oxide and terbium oxide in the raw material, LAP green fluorescent powders of different compositions are synthesized; by controlling the granularity and distribution of the rare earth raw material, the granularity and distribution of the green fluorescent powder are controlled; by adding a fluxing agent, the quality of the LAP green fluorescent powder is improved.

Description

technical field [0001] The invention relates to a synthesis method of lanthanum cerium terbium phosphate green phosphor with small particle size and narrow distribution, in particular to a synthesis method of lanthanum cerium terbium phosphate green phosphor for energy-saving lamps. Background technique [0002] Lanthanum cerium terbium phosphate green phosphor powder for energy-saving lamps (abbreviated as LAP green phosphor). It is sintered at a certain temperature, and then processed to prepare a green fluorescent powder of lanthanum cerium terbium phosphate. In order to reduce the amount of fluorescent powder used in the current energy-saving lamp manufacturing process, LAP green fluorescent powder is required to have a smaller central particle size and a narrower particle size distribution. In the phosphor preparation process, although the particle size of the LAP green phosphor can be controlled through sintering, ball milling and other processes. However, since the ...

Claims

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Application Information

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IPC IPC(8): C09K11/81
Inventor 刘志刚
Owner GUANGZHOU ZHUJIANG PHOTOELECTRIC NEW MATERIALS
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