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A kind of surface coating method of bam fluorescent powder for lamp

A technology of phosphor powder and surface coating, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of powder agglomeration, unstable surface electrical properties and chemical properties, etc., to shorten the cycle, improve the thermal degradation resistance, and improve the surface damage effect

Active Publication Date: 2016-06-15
GUANGZHOU ZHUJIANG PHOTOELECTRIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to external factors and the factors of the luminescent material itself, the luminescent material without surface treatment often has phenomena such as powder agglomeration, unstable surface electrical properties and chemical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 1300g of lanthanum nitrate and dissolve it in 5000ml of water to prepare a 0.6mol / L lanthanum nitrate solution. Weigh 100g of BAM for lamps (BaMgAl 10 o 17 :Eu 2+ ) Phosphor powder, put into 1L aqueous solution, stir for 60 minutes to make a suspension. Weigh 0.21 g of ammonium bicarbonate and dissolve it in 2.1 ml of water to prepare a 10% ammonium bicarbonate solution by mass. Control the water temperature at 15-40°C, and add 1ml of the prepared lanthanum nitrate solution into the fluorescent powder suspension under stirring. After stirring for 15 minutes, add all the prepared ammonium bicarbonate solution, and continue stirring for 15 minutes. minute. Wash with hot water at 60°C until the conductivity is less than 10 μs / cm, put it into a tray, and dry at 150°C to obtain a BAM phosphor for lamps coated with lanthanum carbonate.

Embodiment 2

[0024] Weigh 2100g of yttrium chloride and dissolve it in 5000ml of water to prepare a 1mol / L yttrium chloride solution. Weigh 300Kg lamp with BAM (BaMgAl 10 o 17 :Eu 2+ ) Phosphor powder, put into 3000L aqueous solution, stir for 60 minutes to make a suspension. Weigh 1800ml of ammonia solution with a mass percent concentration of 5%. Control the water temperature at 15-40°C, and add 4950ml of the prepared yttrium chloride solution into the phosphor suspension under stirring. After stirring for 15 minutes, add all the prepared ammonia solution and continue stirring for 15 minutes. . After washing with hot water at 60°C until the conductivity is less than 10 μs / cm, put it into a tray and dry it at 150°C to obtain a BAM phosphor for lamps coated with yttrium oxide.

Embodiment 3

[0026] Weigh a certain amount of 0.01-1mol / L alumina sol and dissolve it in water, and weigh the BAM (BaMgAl 10 o 17 :Eu 2+ ) Phosphor powder, dissolved in water, prepare a suspension with a molar concentration of 0.1-1mol / L, according to the molar ratio of alumina to phosphor (0.01-1): 1 ratio, measure the required alumina sol, according to the oxidation The molar ratio of aluminum to ammonium bicarbonate is 2:3, and the corresponding amount of ammonium bicarbonate is weighed to form an ammonium bicarbonate solution with a concentration of 10% by mass. Control the water temperature at 15-40°C, and in the state of stirring, after adding alumina sol, add ammonium bicarbonate solution after 10-30 minutes, and continue stirring for 10-30 minutes. An aluminum oxide hydrate coating is formed on the phosphor powder in the phosphor powder suspension. After washing and dehydrating with hot water at 50-80°C until the conductivity is less than 10 μs / cm, put it into a tray and dry it ...

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Abstract

The invention discloses a surface coating method for lamp-used BMA phosphor. The surface coating method comprises the steps of weighing a yttrium salt or a lanthanum salt or an alumina sol to prepare a water-soluble salt solution; weighing ammonium bicarbonate or aqueous ammonia to prepare an ammonium bicarbonate or an aqueous ammonia solution; then preparing a turbid liquid by using the lamp-used BMA phosphor; stirring the turbid liquid; controlling a water temperature; adding the water-soluble salt solution; adding the ammonium bicarbonate or the aqueous ammonia solution; stirring continuously; then cleaning with hot water; dewatering until a conductivity is smaller than 10 [mu]s / cm; and drying to obtain the BMA phosphor coated by one or more of yttrium oxide, yttrium carbonate, lanthanum oxide, lanthanum carbonate and alumina. The surface coating method changes the surface characteristic of the phosphor, improves surface damages of the phosphor, increases dispersibility of the phosphor, and is beneficial to heat-resistant degradation of the lamp-used BMA phosphor and to industrialization.

Description

technical field [0001] The invention relates to a method for coating the surface of BAM fluorescent powder used in lamps. Background technique [0002] A major application field of rare earth luminescent materials is electric light sources, and the output of fluorescent powder for lamps occupies the first place among all fluorescent powders. [0003] At present, the commonly used fluorescent powder components for red, green and blue three primary color lights are: red powder (Y 2 o 3 :Eu 3+ ), green powder (MgAl 11 o 19 : Ce 3+ , Te 3+ ,LaPO 4 : Ce 3+ , Te 3+ ), blue powder (BaMgAl 10 o 17 :Eu 2+ ), these phosphors have good luminous efficiency and chemical stability, and have been widely used. [0004] In order to reduce the amount of powder coated on the straight-tube energy-saving lamps and reduce costs, the required phosphor powder requires a smaller particle size. The high-temperature solid-phase synthesis method is still the most important phosphor synthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64C09K11/02
Inventor 张秋实李航
Owner GUANGZHOU ZHUJIANG PHOTOELECTRIC NEW MATERIALS
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