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Calcium titanate luminescent material and preparation method thereof

A luminescent material, calcium titanate technology, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as low luminous efficiency, reduced luminous efficiency, increased non-radiative transition probability, etc., and achieves simple preparation process, enhanced luminescence, and equipment less demanding effect

Inactive Publication Date: 2012-05-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this type of material has the problem of low luminous efficiency, which limits the practical application, which is related to its structural defects, such as CaTiO 3 : The luminescent center Pr in the Pr material 3+ Ion substitution of A-site Ca in the perovskite structure 2+ ions, easy to cause Ca 2+ Defects such as ion vacancies and oxygen vacancies, these defects will increase the probability of non-radiative transitions and reduce the Pr 3+ Luminous efficiency

Method used

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  • Calcium titanate luminescent material and preparation method thereof
  • Calcium titanate luminescent material and preparation method thereof
  • Calcium titanate luminescent material and preparation method thereof

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preparation example Construction

[0022] The invention provides a preparation method of calcium titanate luminescent material, such as figure 1 As shown, the preparation process is as follows:

[0023] Step S1, according to the general chemical formula Ca 1-x Ti 1-y o 3 : The stoichiometric ratio of each element in xPr, yR provides the source compound of Pr, the source compound of R and the source compound of Ca, and then configures the molar concentration of Pr ion to be 0.05~0.4mol / L and the molar concentration of R ion to be 0.05 respectively ~0.5mol / L and an aqueous solution with a Ca ion molar concentration of 1~2mol / L; wherein, 0.001≤x≤0.01, 0.005≤y≤0.03, R is at least one of Al or Ga;

[0024] Step S2, adding 3.52 mL of tetrabutyl titanate to an ethanol solution of citric acid (wherein, the molar concentration of citric acid is 7×10 -7 ~2×10 -6 mol / L), stirred for 30 minutes, then added 0.2-0.6 mL of the aqueous solution containing Pr ions and 0.2-2 mL of the aqueous solution containing R ions prep...

Embodiment 1

[0031] Weigh 2.1751g of praseodymium nitrate to make a 100mL 0.05mol / L solution; 1.8757g of aluminum nitrate to make a 100mL 0.05mol / L solution; 23.615g of calcium nitrate to make a 100mL 1mol / L solution. Weigh 0.4247g silver nitrate, dissolve in deionized water, and make 100mL 1×10 -2 mol / L solution.

[0032] Weigh 0.04mol or 7.6848g of citric acid and place it in a dry beaker, add 20mL of absolute ethanol, continue to stir for 30min after the citric acid is dissolved, slowly add 3.52mL of tetrabutyl titanate, gradually form a light yellow liquid, slowly drop in nitric acid Praseodymium 0.2mL and aluminum nitrate 0.2mL, after stirring evenly, slowly add calcium nitrate solution 9.99mL and silver nitrate solution 0.1mL to prevent hydrolysis of tetrabutyl titanate, continue stirring for 5h, heat up to 50°C, evaporate to dryness, from 50 ℃ gradually increased to 150 ℃ and dried in an oven to obtain tan precursor powder. The precursor was placed in a muffle furnace, heated to 50...

Embodiment 2

[0034] Weigh 8.7002g of praseodymium nitrate to make a 100mL 0.2mol / L solution; 11.2539g of aluminum nitrate to make a 100mL 0.3mol / L solution; 35.4225g of calcium nitrate to make a 100mL 1.5mol / L solution. Weigh 0.0412g of chloroauric acid, dissolve in deionized water, and make 100mL 1×10 -3 mol / L solution.

[0035] Weigh 0.04mol or 7.6848g of citric acid and put it in a dry beaker, add 40mL of absolute ethanol, continue to stir for 30min after the citric acid is dissolved, slowly add 3.52mL of tetrabutyl titanate, gradually form a light yellow liquid, slowly drop in nitric acid 0.5mL of praseodymium and 1mL of aluminum nitrate, after stirring evenly, slowly add 6.6mL of calcium nitrate solution and 0.1mL of chloroauric acid solution to prevent hydrolysis of tetrabutyl titanate, continue stirring for 1h, raise the temperature to 70°C, evaporate to dryness, ℃ gradually increased to 150 ℃ and dried in an oven to obtain tan precursor powder. The precursor was placed in a muffle...

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Abstract

The invention belongs to the field of luminescent materials, and discloses a calcium titanate luminescent material and a preparation method thereof. The chemical general formula of the calcium titanate luminescent material is Ca1-xTi1-yO3: xPr, yR, M, wherein 0.001<=x<=0.01, 0.005<=y<=0.03, R refers to at least one of Al and Ga, and M refers to at least one of nano particles of Ag, Au, Pt and Pd. The calcium titanate luminescent material is simple in preparation process, low in equipment requirement and short in preparation period. A small quantity of metallic nano particles is added into the luminescent material to enhance luminescence of the luminescent material, and the luminous intensity can be enhanced under excitation of cathode rays.

Description

technical field [0001] The invention relates to the field of photoelectric materials, in particular to a calcium titanate luminescent material. The invention also relates to a preparation method of the calcium titanate luminescent material. Background technique [0002] Red phosphors include several types of materials such as sulfides, oxides, sulfur oxides, and titanates. Among them, titanate materials have the advantages of high stability and good color rendering performance, and can be used in It is suitable for occasions that require high stability of phosphor powder, such as field emission display screens used under low voltage and high current density. Typical representative material of titanates CaTiO 3 : The CIE chromaticity coordinates of Pr are x=0.680 and y=0.311, which is very close to the ideal red light. It is a relatively ideal phosphor and has a great application prospect. [0003] However, this type of material has the problem of low luminous efficiency, ...

Claims

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Application Information

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IPC IPC(8): C09K11/67
Inventor 周明杰王烨文马文波
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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