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Method for reducing phosphor powder granularity distribution width

A particle size distribution and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as difficult product refinement development, many surface defects, uneven powder coating, etc., and achieve simple and easy grading effect, particle size Uniform distribution and easy operation

Inactive Publication Date: 2013-02-13
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Uneven particles will increase the amount of powder used during use and increase the cost of use. It is also the cause of troubles such as black spots on the device after use and uneven powder coating.
At the same time, sintering and crushing of small particles of phosphor powder below 1 μm have incomplete crystal structure, many surface defects, low luminous efficiency, and poor anti-deterioration performance during use, which is usually the culprit for reducing the anti-deterioration performance of phosphor powder.
[0004] Therefore, the particle size distribution is not concentrated, and it is not easy to realize the refined development of commodities, especially now that the types of light sources and display devices are getting better and the coarse and fine particles in the powder after crushing are removed, it is necessary to carry out proper particle size sorting in the phosphor powder preparation process.

Method used

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  • Method for reducing phosphor powder granularity distribution width
  • Method for reducing phosphor powder granularity distribution width

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Silicate green phosphor SrBa 0.94 SiO: 0.04Eu, weigh 100ml of powder with a measuring cylinder, then pour it into a container, and weigh 500ml of deionized water and 5ml of foaming agent, mix and pour into the same container, stir at 800r / min for 30 minutes to the bottom Settling green powder is not retained, and a large amount of green foam is produced on the surface of the liquid, then stop stirring, and immediately perform ultrasonication for 1min at a frequency of 100kHZ; then remove the upper layer of light green foam, and remove the similar suspension on the upper layer other than the bottom settled powder Pour into another container, settle for 5h, pour out the supernatant, (add 2500ml deionized water, stir for 5min, then settle for 5h, pour out the supernatant), repeat the steps in brackets 5 times, and then settle the bottom The powder was dried at 40°C for 2 hours to obtain the desired powder.

[0022] SrBa at this time 0.94 The particle size distribution da...

Embodiment 2

[0030] Nitrogen oxide green phosphor Sr 0.97 Si 2 o 2 N 2 : 0.03Eu, weigh 200ml of powder with a measuring cylinder, then pour it into a container, and weigh 600ml of deionized water and 6ml of foaming agent, mix them and pour them into the same container, stir at 600r / min for 60 minutes until the bottom is clear Keep the settled green powder, and a large amount of green foam is produced on the surface of the liquid, then stop stirring, and immediately perform ultrasonication for 5 minutes at a frequency of 40kHZ; then remove the light green foam on the upper layer, and pour the similar suspension other than the settled powder at the bottom into another In a container, settle for 20 hours, pour out the supernatant (add 3000ml deionized water, stir for 5 minutes, then settle for 20 hours, pour out the supernatant), repeat the steps in the brackets 3 times, and then remove the powder settled at the bottom After drying at 80°C for 1 hour, the desired powder was obtained.

Embodiment 3

[0032] Silicate turquoise phosphor Ba 1.94 SiO 4 : 0.06Eu, weigh 300ml of powder with a measuring cylinder, then pour it into a container, and weigh 1200ml of deionized water and 12ml of foaming agent, mix them and pour them into the same container, stir at 400r / min for 100 minutes until the bottom is clear Keep the settled green powder, and a large amount of green foam is produced on the surface of the liquid, then stop stirring, and immediately perform ultrasonication for 3 minutes at a frequency of 60kHZ; then remove the light green foam on the upper layer, and pour the similar suspension other than the settled powder at the bottom into another In a container, settle for 10 hours, pour out the supernatant (add 5000ml deionized water, stir for 5 minutes, then settle for 10 hours, pour out the supernatant), repeat the steps in the brackets 3 times, and then remove the powder settled at the bottom The desired powder was obtained after drying at 50°C for 6 hours.

[0033] The...

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Abstract

The invention relates to a method for reducing the phosphor powder granularity distribution width, which is characterized by comprising the following steps: (1) placing phosphor powder in a container and adding deionized water the volume of which is 3-5 times that of the phosphor powder, and a foaming agent; (2) rapidly stirring for at least 30min to fully mix; (3) stopping stirring and carrying out ultrasonic treatment in the meantime; (4) removing foams generated on the surface of a solution; (5) standing for 1-10min, pouring the supernatant liquid of the solution into another container, and keeping sedimentary large-particle powder at the bottom; (6) settling the supernatant liquid poured into the another container for 5-20h, pouring the supernatant liquor to leave the lower power, and parching the lower power at the temperature of 40-80 DEG C for 1-8h till dry. The method disclosed by the invention is simple in operation and applicable to the laboratory and commercial process and is reduced in the granularity distribution width of the phosphor powder, thereby being beneficial to the powder packaging process.

Description

technical field [0001] The invention relates to a method for reducing the particle size distribution width of fluorescent powder. Background technique [0002] The history of rare earth phosphors has been around for decades. So far, the synthesis methods of phosphors in industrial production are mostly high-temperature solid-phase methods. According to the production process of "raw material mixing→sintering→crushing→sorting→washing→drying→inspection", after the powder is pulverized, there is generally a problem of wide particle size distribution. [0003] Uneven particles will increase the amount of powder used during use and increase the cost of use. It is also the cause of troubles such as black spots on the device after use and uneven powder application. At the same time, sintering and crushing of small particles of phosphor powder below 1 μm have incomplete crystal structure, many surface defects, low luminous efficiency, and poor anti-deterioration performance during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 苏醒宇赵莉
Owner IRICO