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Method for preparing aluminate green phosphor with low content of terbium

A technology of aluminate and content, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced luminous performance of phosphor powder, increased cost of fluorescent lamps, and high price of rare earth terbium oxide, so as to reduce usage, reduce cost, The effect of improving cost performance

Inactive Publication Date: 2012-08-22
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high price of rare earth terbium oxide makes the price of existing polyaluminate green powder remain high and increases the cost of fluorescent lamps
If the content of terbium in the polyaluminate green powder is reduced, the price of the green powder will certainly decrease, but at the same time, the luminous performance of the phosphor will also be greatly reduced

Method used

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  • Method for preparing aluminate green phosphor with low content of terbium
  • Method for preparing aluminate green phosphor with low content of terbium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Ce 0.80 MgAl 11 o 19 :Tb 0.20

[0017] 1) Take 3.581g of cerium oxide, 1.049g of magnesium oxide, 14.582g of aluminum oxide, and 0.096g of magnesium fluoride, grind them in a mortar for one hour, put them in a crucible, and calcinate them in a muffle furnace at 1600°C for 7 hours Afterwards, cool naturally, take out and grind for half an hour to obtain powder A without terbium;

[0018] 2) Take 0.972g of terbium oxide, dissolve it in hydrochloric acid, and make it into a 0.05mol / L Tb ion solution, pour the powder A into the Tb ion solution, and slowly add 2mol / L ammonia water under stirring to adjust the pH Adjust the value to 8.0 to make Tb ions precipitate on the surface of powder A;

[0019] 3) Then continue to stir for 30 minutes, and then stand still for 30 minutes to completely precipitate Tb ions, filter and dry to obtain loose powder B.

[0020] 4) put the powder into the crucible, under N 2 95% / H 2 After reacting at 1450° C. for 3 hours in a 5% reducing...

Embodiment 2

[0022] Ce 0.78 MgAl 11 o 19 :Tb 0.22

[0023] 1) Take 3.490g of cerium oxide, 1.048g of magnesia, 14.575g of aluminum oxide, and 0.191g of boric acid, grind them in a mortar for one hour, put them in a crucible, and calcinate them in a muffle furnace at 1500°C for 6 hours, Cool naturally, take it out and grind it for half an hour to obtain terbium-free powder A;

[0024] 2) Take 1.069g of terbium oxide, dissolve it in hydrochloric acid, and make a solution of 0.05mol / L, pour the powder A into the Tb ion solution, add 25ml of 1mol / L urea solution under stirring, and then dissolve the solution Heat to 90°C to precipitate Tb ions on the surface of powder A;

[0025] 3) Constant temperature for 2 hours, then continue to stir for 30 minutes, and then let it stand for 30 minutes to completely precipitate Tb ions, filter and dry to obtain loose powder B;

[0026] 4) put the powder B into the crucible, 2 90% / H 2 After reacting at 1300° C. for 4 hours in a 10% reducing atmosphe...

Embodiment 3

[0028] Ce 0.75 MgAl 11 o 19 :Tb 0.25

[0029] 1) Take 3.353g of cerium oxide, 1.047g of magnesium oxide, 14.565g of aluminum oxide, and 0.569g of aluminum fluoride, grind them in a mortar for one hour, put them into a crucible, and calcinate them in a muffle furnace at 1450°C for 5 hours Afterwards, cool naturally, take it out and grind for half an hour to obtain powder A without terbium.

[0030] 2) Take 1.214g of terbium oxide, dissolve it in nitric acid, and make it into a 0.20mol / L Tb ion solution, pour the powder A into the Tb ion solution, and slowly add 10mol / L of ammonia water under stirring to adjust the pH Adjust the value to 9.5 to make Tb ions precipitate on the surface of powder A;

[0031] 3) Continue to stir for 60 minutes, and then let stand for 45 minutes to completely precipitate Tb ions, filter and dry to obtain loose powder B;

[0032] 4) put the powder into the crucible, under N 2 95% / H 2 After reacting at 1525° C. for 5 hours in a 5% reducing atmo...

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Abstract

The invention discloses a method for preparing aluminate green phosphor with low content of terbium, which comprises the steps: preparing powder without terbium at first, precipitating Tb element on the powder and then putting the powder into high temperature reaction in the reducing atmosphere to obtain aluminate green phosphor with the component of CeaMgAl11O10:Tb1-a. The aluminate green phosphor prepared by the method has terbium content which can be lowered by 10-40% and relative brightness which is lowered by 1-5% only, therefore, the method effectively reduces production cost of terbium-excited aluminate green phosphor and raises price performance of the aluminate green phosphor.

Description

technical field [0001] The invention relates to a preparation method of aluminate green powder excited by terbium, in particular to a preparation method of aluminate green powder with low terbium content. Background technique [0002] The chemical composition of terbium-activated aluminate green powder is Ce a MgAl 11 0 19 :Tb 1-a , (0.6≤a<1), is one of the green powders commonly used in tricolor fluorescent lamps, and its optimal ratio is Ce 0.67 MgAl 11 o 19 :Tb 0.33 . Terbium element is the excitation element of this phosphor, and it is an indispensable element in this green powder. [0003] The synthesis of the existing aluminate green powder basically adopts a high-temperature solid-phase method, and the rare earth ions are evenly distributed on the surface and inside of the matrix, which requires the use of more terbium elements. The high price of rare earth terbium oxide makes the price of the existing polyaluminate green powder remain high and increases t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 刘宗淼万国江徐燕
Owner JIANGMEN KANHOO IND
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