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Preparation method for rare earth tricolored red phosphor used for lamp

A technology of red phosphor and three primary colors, which is applied in the field of preparation of rare earth tri-color red phosphor for straight-tube energy-saving lamps, can solve the problems of poor application and insufficient coating performance, and achieves guaranteed luminous effect, excellent performance and dispersion. good effect

Inactive Publication Date: 2013-09-04
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • 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 rare-earth tri-color red fluorescent powder for lamps, so as to solve the problems of insufficient coating performance and poor application of traditional red fluorescent powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 1. Material selection

[0024] The yttrium-europium oxide coprecipitate containing 4.6% europium by mass fraction and the auxiliary agent passing through a 65-mesh sieve;

[0025] 2. Mixing

[0026] Co-precipitated yttrium and europium oxide is the main raw material, adding additives (barium chloride dihydrate and boric acid), the mass ratio of barium chloride dihydrate and boric acid is 1:0.3, the mass ratio of coprecipitated yttrium and europium oxide to additives 0.4% to 3.5%, fully mixed to obtain a mixture;

[0027] 3. Firing

[0028] Put the mixture into a corundum crucible, place it in an oxidizing atmosphere furnace at 1400°C for 1 hour, cool to room temperature, and pass through a 10-mesh flat sieve to obtain a fired product;

[0029] 4. Dispersion by ball milling

[0030] Add an appropriate amount (less than 200L) of deionized water to the fired product to make a slurry by stirring to obtain a slurry, inject the slurry into a ball mill disperser, and perfo...

example 2

[0036] 1. Material selection

[0037] Yttrium oxide, europium oxide and a co-solvent passed through a 65-mesh sieve; the purity of yttrium oxide is 99.99%, and the purity of europium oxide is 99.9%;

[0038] 2. Mixing

[0039] Yttrium oxide and europium oxide are the main raw materials, prepared according to the mass ratio of 15.15:1, adding additives (boric acid, barium fluoride and ammonium chloride), the mass ratio of boric acid, barium fluoride and ammonium chloride is 1:0.3:0.24 , the mass ratio of yttrium oxide and europium oxide to additives is 0.4% to 3.5%, fully mixed to obtain a mixture;

[0040] 3. Firing

[0041] Put the mixture into a corundum crucible, place it in an oxidizing atmosphere furnace at 1380°C for 2 hours, cool to room temperature, and pass through a 10-mesh flat sieve to obtain a fired product;

[0042] 4. Dispersion by ball milling

[0043] The fired product is added to deionized water for stirring and slurrying to obtain the slurry, and the slu...

example 3

[0049] 1. Material selection

[0050] The yttrium-europium co-precipitate, yttrium oxide and 65-mesh sieve co-solvent containing 5.8% europium in mass fraction;

[0051] 2. Mixing

[0052] Take yttrium oxide and europium co-precipitate (6.6% europium mass fraction) and yttrium oxide as the main raw materials, the purity of yttrium oxide is 99.99%, and prepare the main raw material containing 5.8% europium mass fraction, add additives (dihydrate chlorine Barium chloride and boric acid), the mass ratio of barium chloride dihydrate and boric acid is 1:0.03, the mass ratio of yttrium oxide and europium oxide coprecipitate and yttrium oxide to additives is 0.4% to 3.5%, fully mixed to obtain a mixture;

[0053] 3. Firing

[0054] Put the mixture into a corundum crucible, place it in an oxidizing atmosphere furnace at 1450 ° C for 2 hours, cool to room temperature, and pass through a 10-mesh flat sieve to obtain a fired product;

[0055] 4. Dispersion by ball milling

[0056] Th...

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Abstract

The invention discloses a preparation method for rare earth tricolored red phosphor used for a lamp. Main raw materials comprise one or more of a yttrium europium oxide co-precipitate, yttrium oxide europium oxide, 4.6-7.5% by mass of europium. The preparation method comprise the steps of weighing the main raw materials; adding auxiliary agents; mixing the above materials thoroughly to obtain a mixture; sintering the mixture; cooling to a room temperature, screening to obtain a sintered product; adding deionized water to the sintered product for slurrying; injecting the slurry into a ball-milling dispersion machine and dispersing the slurry by the ball milling dispersion machine to obtain a powder slurry; filtering the powder slurry by a water sieve, injecting the powder slurry in a cleaning tank, cleaning with warm water; draining liquid supernatant after sedimentation; screening, removing water; finally loading the dewatered powder into a drying machine for drying, cooling to the room temperature, and screening to obtain the red phosphor. The prepared red phosphor has excellent performance, good dispersibility and good coating performance, effectively increases utilization rate of the phosphor in the lamp, and saves phosphor consumption than a conventional red phosphor while guaranteeing a luminescence effect.

Description

technical field [0001] The invention relates to a preparation method of red fluorescent powder, in particular to a preparation method of rare-earth three-primary-color red fluorescent powder for straight-tube energy-saving lamps. Background technique [0002] In recent years, energy-saving requirements have become higher and higher, and high-efficiency, high-load straight-tube fluorescent lamps have developed rapidly. The red phosphor used in them is Y 2 o 3 : Eu 3+ Red phosphor as matrix material. Y 2 o 3 : Eu 3+ The red fluorescent powder is a white powder with a cubic crystal system. Under the excitation of 253.7nm ultraviolet light, it emits high-efficiency red fluorescence, and the main peak wavelength is 611nm. The utilization rate of traditional phosphor powder for lamps is low, and the coating performance is obviously insufficient. Contents of the invention [0003] The object of the present invention is to provide a preparation method of rare-earth tri-colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 陈永鑫李甜
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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