Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing red phosphor for CCFL

A technology of red fluorescence and phosphor, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor application characteristics and poor dispersion of red phosphor powder, and achieve excellent coating performance, small cohesion, and smooth film surface. Effect

Inactive Publication Date: 2009-10-28
CAIHONG GRP ELECTRONICS CO LTD
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of red fluorescent powder for CCFL, so as to solve the problems of poor dispersibility, serious aggregation and poor application characteristics of red fluorescent powder powder in the traditional process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation:

[0022] 1. Prepare the co-precipitated body of yttrium and europium containing 5.6% europium by mass and the flux passing through a 100 mesh sieve; the flux is a mixture of boron oxide and barium chloride mixed in a mass ratio of 1:10.

[0023] Mixture:

[0024] 2. Take the coprecipitated body of yttrium and europium oxide as raw material, add a flux of 1.0% of the mass of the coprecipitated body of yttrium and europium oxide, and mix thoroughly to obtain mixture A;

[0025] Firing:

[0026] 3. Put the mixture A into an alumina crucible, put it in an electric tunnel furnace with an oxidizing atmosphere, and burn it at 1360°C for 3 hours, then cool it to room temperature, and pass it through a 100-mesh dry sieve to obtain a phosphor fired product;

[0027] dispersion:

[0028] 4. Put the red phosphor fired product into the disperser, and disperse it according to the following conditions. The phosphor fired product: ball: water is dispersed in a weight ra...

Embodiment 2

[0035] Preparation:

[0036] 1. Prepare the co-precipitated body of yttrium and europium oxide containing 8.0% europium by mass percentage and the flux passing through a 100 mesh sieve: boric acid;

[0037] Mixture:

[0038] 2. Take the coprecipitated body of yttrium and europium oxide as raw material, add boric acid with 0.5% of the mass of the coprecipitated body of yttrium and europium oxide, and mix thoroughly to obtain mixture A;

[0039] Firing:

[0040] 3. Put the mixture A into an alumina crucible, put it in an electric tunnel furnace with an oxidizing atmosphere, and burn it at 1500°C for 4 hours, then cool it to room temperature, and pass it through a 100-mesh dry sieve to obtain a phosphor fired product;

[0041] dispersion:

[0042] 4. Put the phosphor fired product into the dispersing machine, and disperse according to the following conditions, the phosphor fired product: ball: water is dispersed in a weight ratio of 1:2:2, the dispersion speed is 40 rpm, and t...

Embodiment 3

[0049] Preparation:

[0050] 1. Prepare the co-precipitated body of yttrium and europium oxide containing 7.0% europium and the flux lithium phosphate passing through a 100 mesh sieve;

[0051] Mixture:

[0052] 2. Take the coprecipitated body of yttrium and europium oxide as raw material, add a flux of 1.0% of the mass of the coprecipitated body of yttrium and europium oxide: lithium phosphate, and mix thoroughly to obtain mixture A;

[0053] Firing:

[0054] 3. Put the mixture A into an alumina crucible, put it in an electric tunnel furnace with an oxidizing atmosphere and burn it at 1400°C for 3 hours, then cool it down to room temperature, and pass it through a 100-mesh dry sieve to obtain a phosphor fired product;

[0055] dispersion:

[0056] 4. Put the fired red phosphor into the dispersing machine, and disperse according to the following conditions. The fired phosphor: ball: water is dispersed in a weight ratio of 1:2:3, and the dispersion speed is 40 rpm. Time is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing red fluorescent powder, in particular to a method for preparing red fluorescent powder for a CCFL. The prior red phosphor has the defects of poor powder dispersity, large particle cohesion, time consumption for powder slurry preparation, low tube-coating rate, unsmooth film surface after the powder slurry is coated on a light tube and obvious condensation point in the application process and the like. The method comprises the following steps: firstly, preparing a co-deposit of yttrium oxide and europium oxide and a cosolvent; secondly, mixing materials, burning the mixture after the material mixing in an oxidizing atmosphere, cooling the mixture to the room temperature, and screening the mixture to obtain a burnt finished product of the phosphor; dispersing the phosphor finished product, and slurrying; and finally, adding nanometer aluminum oxide to the powder slurry, removing the moisture content and drying, reducing the temperature to the room temperature, and screening the mixture to obtain the red phosphor. The red fluorescent powder prepared by the method has small particle cohesion, good dispersity, excellent coating performance, smooth film surface after the powder slurry is coated on a light tube, and no obvious condensation point.

Description

1. Technical field [0001] The invention relates to a preparation method of red fluorescent powder, in particular to a preparation method of red fluorescent powder for CCFL. 2. Background technology [0002] In recent years, high-efficiency narrow-diameter cold-cathode fluorescent lamps have developed rapidly, and the red phosphor used in them is based on Y 2 o 3 : Eu is the host material red phosphor. Y 2 o 3 : Eu red phosphor is white powder, cubic crystal system, it is a very effective luminescent material under 253.7nm ultraviolet excitation, it emits orange-red fluorescence under 253.7nm ultraviolet excitation, and the main peak wavelength is 611nm; its color coordinates will vary depending on the content of europium It varies from person to person, generally x is between 0.646 and 0.654, and y is between 0.346 and 0.351. At present, the red phosphors used in the narrow-diameter cold cathode fluorescent lamps (CCFL) on the market do not have much difference in lumin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K11/80
Inventor 席增卫梁喜宇刘铨铃李蓬
Owner CAIHONG GRP ELECTRONICS CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com