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Surface treatment method for phosphate green phosphor for illumination

A phosphate phosphorescence and green phosphorescence technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as poor film quality and poor short-wave ultraviolet resistance, and achieve easy large-scale production, short preparation process cycle, and high-quality products. Good application performance

Inactive Publication Date: 2013-01-23
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor film-forming quality and short-wave ultraviolet resistance of rare earth phosphate green phosphors, this patent adopts the sol-gel method to synthesize the treatment material on the surface of phosphors, which can overcome the above-mentioned problems of green phosphors, so that it can be used in the field of lighting widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment includes the following steps:

[0019] 1. According to the weight of the required rare earth phosphate phosphor 100kg, the rare earth nitrate with a stoichiometric ratio of 0.001~0.01 is measured, calculated according to the nitrate with La added, 1% ratio is required, and 3500g of rare earth nitrate is required;

[0020] Two, the above-mentioned rare earth nitrate is added to deionized water, the weight of deionized water is 10 times of the weight of the rare earth phosphate phosphor to be processed, that is, 1000kg deionized water, fully stirred to a completely dissolved state;

[0021] 3. Slowly add the required weight of phosphate phosphor powder to the rare earth nitrate solution prepared in step 2 while maintaining continuous stirring;

[0022] 4. Continue to stir and keep the temperature to 30 degrees Celsius, select the alkaline aqueous solution KOH with a mass concentration of less than 5%, add it to the reaction solution prepared in step 3 at a...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] 1. According to the weight of 500g of the required rare earth phosphate phosphor, the rare earth nitrate with a stoichiometric ratio of 0.001~0.01 is measured, calculated according to the nitrate with Y added, 1% ratio is required, and 27g of rare earth nitrate is required;

[0031] 2. Add the above-mentioned rare earth nitrate to deionized water, the weight of the deionized water is 10 times the weight of the rare earth phosphate phosphor to be treated, and fully stir until it is completely dissolved;

[0032] 3. Slowly add the required weight of phosphate phosphor powder to the rare earth nitrate solution prepared in step 2 while maintaining continuous stirring;

[0033] Four, keep stirring and constant temperature to 30 degrees centigrade, select the alkaline aqueous ammonia water with a mass concentration of less than 5%, the ammonia water is analytical pure ammonia water, the concentration is 25%, and the subst...

Embodiment 3

[0040] 1. According to the weight of the required rare earth phosphate phosphor, the rare earth nitrate with a stoichiometric ratio of 0.001 is measured;

[0041] 2. Add the above-mentioned rare earth nitrate to deionized water, the weight of the deionized water is 11 times the weight of the rare earth phosphate phosphor to be treated, and fully stir until it is completely dissolved;

[0042] 3. Slowly add the required weight of phosphate phosphor powder to the rare earth nitrate solution prepared in step 2 while maintaining continuous stirring;

[0043] 4. Continue to stir and keep the temperature at 33 degrees Celsius. Select an alkaline aqueous solution of ammonia with a mass concentration of less than 5%. Add the reaction solution prepared in step 3 at a rate of less than 1ml / s, and dilute the reaction solution to a mass concentration of 0.5%. between;

[0044] 5. After the addition is complete, continue to stir for more than 4 hours to fully react, then stop stirring, an...

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Abstract

The invention discloses a surface treatment method for phosphate green phosphor for illumination. The method comprises the following steps of: metering rare-earth material, namely nitrate of which the stoichiometric ratio is 0.001 to 0.01 based on the weight of rare-earth phosphate phosphor, and adding the rare-earth material, namely nitrate into deionized water; stirring, and slowly adding phosphate phosphor powder into a solution; continuously stirring, and keeping constant temperature of between 30 and 35 DEG C; adding an alkaline aqueous solution KOH or ammonia water into the reaction solution; diluting until the concentration is about 1 percent; continuously stirring for over 4 hours; standing and settling; discharging water; washing for 3 to 5 times; dehydrating, firing at the temperature of between 150 and 200 DEG C for 1 to 2 hours; and sieving by using a 100-mesh nylon or stainless steel sieve to obtain phosphor of which the surface is coated with a film. By the method, the using performance of the rare-earth phosphate phosphor can be improved obviously, so that the effects of improving the quality of the formed film and short-wave ultraviolet resistance capacity can be achieved.

Description

technical field [0001] The invention relates to a preparation method of a protective film, in particular to a surface treatment method of a phosphate green phosphor for lighting. Background technique [0002] In recent years, with the large-scale application of rare earth phosphors for lighting, higher requirements have been put forward for phosphor products. Due to their own surface characteristics, traditional phosphate phosphors generally suffer from poor film quality after being made into lamp tubes. Many condensation, poor short-wave UV resistance and other disadvantages. With the improvement of the quality in the field of lighting, there are higher requirements for luminescent materials, mainly in terms of good film quality, strong short-wave ultraviolet resistance, and long life. [0003] In order to solve the problems of poor film-forming quality and short-wave ultraviolet resistance of rare earth phosphate green phosphors, this patent adopts the sol-gel method to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02
Inventor 李蓬席增卫
Owner CAIHONG GRP ELECTRONICS CO LTD
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