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Prepn of red phosphor

A technology of red fluorescent powder and mother liquor, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced luminous intensity of cathode rays, affecting the luminous performance of red phosphor powder, and decreased luminous brightness, so as to shorten the sintering time and make the process feasible , the effect of short sintering time

Inactive Publication Date: 2005-07-13
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the one-step roasting process step used in this process, the particle size of the product is large, and ball milling is required to reduce the particle size. This process step destroys the crystal form of the red phosphor, resulting in a decrease in luminous brightness, especially the cathode ray luminescence intensity. It is greatly reduced, which seriously affects the luminous performance of the red phosphor

Method used

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  • Prepn of red phosphor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Taking the preparation of red phosphor product 100Kg as an example, the raw materials used and its preparation process steps are as follows:

[0042] 1. Preparation of red phosphor mother liquor

[0043] 4.88Kg Eu 2 o 3 、94Kg Y 2 o 3 , 1.12Kg MgO to make a mixture, HNO 3 Prepare a nitric acid solution with a concentration of 1.2000mol / L with deionized water, and then mix 168LHNO 3 The solution is added to the mixture of the above three substances, and citric acid with a weight ratio of 1:1 is added to the mixture of the above three substances to promote its dissolution, heated at 60-100°C, stirred with a mixer until completely dissolved, and prepared as Y(NO 3 ) 3 , Eu(NO 3 ) 3 , Mg(NO 3 ) 2 Red phosphor mother liquor.

[0044] Eu in the above raw material ratio 2 o 3 , Y 2 o 3 , MgO in a molar ratio of 1:30:2 to make a mixture, and the molar ratio of the nitric acid solution to the mixture of the three substances is 1.5:1.

[0045] 2. Preparation of ox...

Embodiment 2

[0054] Taking the preparation of red phosphor product 100Kg as an example, the raw materials used and its preparation process steps are as follows:

[0055] In the present embodiment, in the preparation process step of red phosphor mother liquor, 5.85KgEu 2 o 3 、93.82KgY 2 o 3 , 0.33KgMgO to make a mixture, HNO 3 Prepare a nitric acid solution with a concentration of 1.2000mol / L with deionized water, and then mix 123LHNO 3 The solution is added to the mixture of the above three substances, heated at 60-100°C, and stirred with a mixer until it is completely dissolved, and prepared as Y(NO 3 ) 3 , Eu(NO 3 ) 3 , Mg(NO 3 ) 2 Red phosphor mother liquor.

[0056] Eu in the above raw material ratio 2 o 3 , Y 2 o 3 , MgO in a molar ratio of 1:25:0.5 to make a mixture, and the molar ratio of the nitric acid solution to the mixture of the three substances is 1.1:1.

[0057]The mixed precipitate dried in the primary roasting process step was roasted in a high-temperature f...

Embodiment 3

[0059] Taking the preparation of red phosphor product 100Kg as an example, the raw materials used and its preparation process steps are as follows:

[0060] In the present embodiment, in the preparation process step of red phosphor mother liquor, 4.14KgEu 2 o 3 、93.01KgY 2 o 3 , 2.85KgMgO to make a mixture, HNO 3 Prepare a nitric acid solution with a concentration of 1.2000mol / L with deionized water, and then add 224LHNO 3 The solution is added to the mixture of the above three substances, heated at 60-100°C, and stirred with a mixer until it is completely dissolved, and prepared as Y(NO 3 )] 3 , Eu(NO 3 ) 3 , Mg(NO 3 ) 2 Red phosphor mother liquor.

[0061] Eu in the above raw material ratio 2 o 3 , Y 2 o 3 , MgO in a molar ratio of 1:35:6 to make a mixture, and the molar ratio of the nitric acid solution to the mixture of the three substances is 2:1.

[0062] The mixed precipitate dried in the primary roasting process step is roasted in a high-temperature furn...

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Abstract

The preparation process of red phosphor includes: mixing Eu2O3, Y2O3 and MgO, Al(NO3)3 or Sb2O3 to form mixture, adding HNO3 solution and citric acid and heating at 60-100 deg.c to prepare red phosphor mother liquid; compounding oxalic acid solution with oxalic acid and deionized water, adding ethanol and heating to 80 deg.c; mixing red phosphor mother liquid with H2O2 at 25-30 deg.c and heating to 80 deg.c, adding the oxalic acid solution to produce precipitate, filtering, washing the precipitate with deionized water and stoving at 90 deg.c in stove for 2 hr; initial roasting of the precipitate in high temperature furnace and cooling; adding to the roasted product with one or two kinds of fluoride, chloride, phosphate or carbonate of alkali metal and alkali earth metal, secondary roasting in high temperature furnace, cooling, washing with dilute nitric acid, washing with deionized water and stoving to obtain the red phosphor.

Description

technical field [0001] The invention belongs to the technical field of general methods of rare earth compounds, and in particular relates to a preparation method of red fluorescent powder. Background technique [0002] Rare earth three primary color phosphors are the main raw materials used to produce high-efficiency energy-saving lamps all over the world. Compared with ordinary incandescent lamps, real rare-earth three-color energy-saving lamps can save up to 80% of electricity, and can obtain a color temperature similar to that of sunlight, so that the color of the illuminated object is pure and undistorted, and its production process does not pollute the environment. It is recognized as an ideal green lighting project today. Rare-earth three-primary-color fluorescent lamps use red, green, and blue phosphors, of which the red phosphor is Y 2 o 3 :Eu. [0003] The Field Emission Display (FED) is a newly developed low-voltage cathode ray fluorescent display. The particu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C09K11/80
Inventor 焦桓郭英余泉貌荆西平
Owner SHAANXI NORMAL UNIV
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