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Preparation method of high-temperature resistant red fluorescent powder for CCFL (cold cathode fluorescent lamp)

A red phosphor, high temperature-resistant technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of unevenness, insignificant effect, incomplete particle lattice, etc., to achieve complete lattice and excellent surface coating effect. , the effect of uniform particles

Active Publication Date: 2013-10-30
英特美光电(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, practice has proved that the effect is not significant. Specifically, there is a big gap with the requirements of red phosphors for CCFL, such as lattice integrity, uniform particles, thermal stability and resistance to 185nm radiation aging.
Specifically by figure 2 As shown, this figure is a scanning electron microscope image of the red phosphor particles used in CCFL in the prior art. It can be seen from this figure that the particle lattice is not complete and uneven

Method used

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  • Preparation method of high-temperature resistant red fluorescent powder for CCFL (cold cathode fluorescent lamp)
  • Preparation method of high-temperature resistant red fluorescent powder for CCFL (cold cathode fluorescent lamp)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A) preparing urea solution, dissolving solid urea in deionized water to obtain an aqueous urea solution with a concentration of 15% by mass;

[0031] B) To prepare the first powder, classify the yttrium europium oxide obtained from the commercial channel, that is, the commercial channel, with a grading sieve, that is, obtain the yttrium europium oxide with a particle size of 3.5-4.5 μm by grading the grading sieve, and obtain the first powder body;

[0032] C) Prepare the first slurry, add the first powder obtained in step B into a stirring container filled with deionized water and equipped with a stirrer, and stir, the weight ratio of the first powder to deionized water is 1 : 5, the stirring speed of the agitator is 300n / min, and the stirring time is 180min to obtain the first powder slurry;

[0033] D) To prepare the second slurry, wash the first slurry obtained in step C) with deionized water for 3 times, pass through a 300-mesh sieve after cleaning, and re...

Embodiment 2

[0039] Only change the mass percentage concentration of the urea aqueous solution in step A) to 8%; change the stirring time in step C) to 300min, the stirring speed to 100n / min, and change the weight ratio of the first powder to deionized water Change it to 1: 2; Change the number of times of cleaning in step D) to 5 times, change the sieve after cleaning to 400 mesh sieves; change the weight ratio of the urea aqueous solution in step E) to the second slurry to 1:100, and change the stirring time and speed to 30min and 300n / min respectively; change the standing precipitation time in step F) to 60min; change the drying temperature in step G) to 140°C, and the drying time Change it to 240min, and change the sieve mesh to 90 mesh sieve; change the process parameters of gradient heating and heat preservation in step H) to: first raise the furnace temperature to 1000°C and keep it warm for 180min, then raise the furnace temperature to 1500°C and hold for 180min. All the other a...

Embodiment 3

[0041] Only change the mass percentage concentration of the urea aqueous solution in step A) to 12%; change the stirring time in step C) to 240min, the stirring speed to 200n / min, and change the weight ratio of the first powder to deionized water Change it to 1: 3.5; Change the number of times of cleaning in step D) to 4 times, change the sieve after cleaning to 200 mesh sieves; change the weight ratio of the urea aqueous solution in step E) to the second slurry to 0.75:100, and change the stirring time and speed to 40min and 200n / min respectively; change the standing precipitation time in step F) to 90min; change the drying temperature in step G) to 130°C, and the drying time Change it to 320min, and change the sieve mesh to 110 mesh sieve; change the process parameters of gradient heating and heat preservation in step H) to: first raise the furnace temperature to 1050°C and keep it warm for 150min, then raise the furnace temperature to 1475°C and keep warm for 210min. All...

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Abstract

The invention relates to a preparation method of high-temperature resistant red fluorescent powder for CCFL (cold cathode fluorescent lamp), belonging to the technical field of preparation for luminescent materials. The preparation method comprises the following steps: dissolving urea in water to obtain urea solution; performing classification process to ytterbium europium oxide and controlling particle size of the ytterbium europium oxide to obtain first powders; adding the first powders into a stirring container filled with deionized water and stirring to obtain first slurries; cleaning the first slurries with the deionized water, sieving, and removing clear liquids after precipitating to obtain second slurries; adding the urea solution into the second slurries and stirring to obtain first mixtures; standing and precipitating the first mixtures, then pouring and removing the clear liquids to obtain second mixtures; dehydrating and drying the second mixtures, and sieving to obtain to-be-baked raw materials; putting the to-be-baked raw materials into the container and conveying into furnaces to bake, taking out of the furnaces and cooling to obtain the finished products. Lattices are completer; particles are more uniform; surface coating effects are excellent; heat stability is ideal; radiation resistance and aging resistance are excellent.

Description

technical field [0001] The invention belongs to the technical field of luminescent material preparation, and in particular relates to a preparation method of high-temperature-resistant red fluorescent powder for CCFL. Background technique [0002] The aforementioned CCFL is the abbreviation of the English name, and the Chinese name is: cold cathode fluorescent lamp, also known as cold cathode fluorescent lamp for backlight. Because CCFL has the characteristics of small tube diameter, simple structure, high surface brightness, small temperature rise, easy processing into various geometric shapes and long service life, it is widely used in various types of backlights and scanners. In particular, with the improvement of its own technology and the rapid development of information technology, office equipment and daily electronic and electrical products, the application range of CCFL is continuously expanding, and the demand is constantly increasing. [0003] The luminescent mec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78C09K11/02
Inventor 周卫新顾竞涛李依群谢玉明
Owner 英特美光电(苏州)有限公司
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