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Cerium activated ultraviolet emitting RE phosphate phosphor and its prepn process

A technology of rare earth phosphate and phosphor, applied in the direction of luminescent materials, chemical instruments and methods, etc.

Inactive Publication Date: 2007-06-06
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an environmentally friendly ultraviolet phosphor with a wide emission peak wavelength and its preparation method to overcome many problems caused by the shortcomings of traditional ultraviolet phosphors

Method used

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  • Cerium activated ultraviolet emitting RE phosphate phosphor and its prepn process
  • Cerium activated ultraviolet emitting RE phosphate phosphor and its prepn process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In order to ensure the accuracy, the rare earth oxide reagent used was firstly treated in an oven at 120°C for 8 hours. According to the chemical formula, 15.476g of lanthanum oxide and 2.171g of cerous nitrate reagent were dissolved in nitric acid to make solution A; 13.966g of diammonium hydrogen phosphate was weighed and dissolved in deionized water to make solution B. Add solutions A and B to a beaker on a water bath at 80°C for precipitation at the same time under constant stirring, age for 1 hour after precipitation, then filter and wash until pH = 7, put the filter cake in an oven at 120°C overnight, add 1% auxiliary solvent and mix thoroughly. It is then loaded into a corundum crucible and compacted. Sintered in air at 1200°C for 6 hours, then at 1200°C H 2 / N 2 In reducing atmosphere (H 2 Accounting for 10%) reduction for 3 hours. After cooling down to room temperature in a reducing atmosphere, take it out from the high-temperature furnace, crush, wash, an...

Embodiment 2

[0035] Weigh 14.5g gadolinium oxide (Gd 2 o 3 ), 3.679g lanthanum chloride (LaCl 3 ) and 1.232g cerous chloride (CeCl 3 ) reagent was dissolved in nitric acid to make solution A; weigh 13.966g of diammonium hydrogen phosphate and dissolve it in deionized water to make solution B. Add solutions A and B to a beaker on a water bath at 50°C for precipitation at the same time under constant stirring, transfer to a hydrothermal kettle after precipitation, age at 200°C for 8 hours, then filter and wash until pH = 7, and filter the cake in Put in an oven at 120°C overnight, add 3% flux and mix thoroughly. It is then loaded into a corundum crucible and compacted. It was sintered in air at 1350°C for 5 hours, then crushed and loaded into a heating furnace together with carbon powder, and reduced at 1150°C for 3 hours. After cooling down to room temperature, take it out from the high-temperature furnace, crush it, wash it, and bake it to get the desired product. The test shows that...

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Abstract

The present invention relates to RE luminescent material technology, and is especially one kind of ultraviolet emitting cerium activated RE phosphate phosphor and its preparation process. The phosphor has the composition of LnxLn'yCe1-x-yPO4, where, each of Ln and Ln' is one of RE elements La, Y and Gd, x is 0-1, and y is 0-1. The preparation process includes the following steps: mixing RE salt precursor solution and diammonium hydrogen phosphate solution to produce precipitate, ageing, mixing with flux, high temperature sintering, and reducing treatment. The phosphor may be activated with 253.7 nm ultraviolet to emit fluorescence of peak wavelength of 317+ / -1 nm, 323+ / -2 nm, 335+ / -2 nm, or 356+ / -1 nm depending on the composition of the phosphor. The phosphor may be used in making black light lamp, mosquito killing lamp, health care lamp and anti-fake product.

Description

technical field [0001] The invention belongs to the technical field of rare-earth luminescent materials, and in particular relates to a cerium-activated rare-earth phosphate ultraviolet-emitting fluorescent powder and a preparation method thereof. Background technique [0002] The ultraviolet-emitting phosphor powder produces near-ultraviolet (wavelength 300-380nm) emission under the excitation of a low-pressure mercury vapor lamp (wavelength 253.7nm). With different emission wavelengths, it can be used in different occasions. For example, it can be used to make ultraviolet components of black light lamps, mosquito killer lamps, health care lamps and fluorescent lamps imitating daylight. The light source for the device. Traditional UV phosphors such as BaSi 2 o 5 : Pb and the like have the disadvantages of low luminous efficiency and low luminous efficiency maintenance rate. At the same time, due to the toxicity of both lead and barium, its production and application are...

Claims

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Application Information

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IPC IPC(8): C09K11/81
Inventor 闫世润胡建国李桂花胡学芳万国江马林
Owner FUDAN UNIV
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