Ceria-doped rare-earth phosphate luminescent material and preparation method thereof

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

Inactive Publication Date: 2011-02-09
苏振彪
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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 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 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. Under continuous stirring, add solutions A and B to a beaker on a water bath at 80°C for precipitation. After precipitation, age for 1 hour, then filter and wash until PH = 7, put the filter cake in an oven at 120°C overnight, and add 1% flux And mix well. 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 reducing to room turbidity in the reducing atmosphere, take it out from the high-temperature furnace, crush, wash, and bake to obtain the desired prod...

Embodiment 2

[0045] 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; 13.966g of diammonium hydrogen phosphate was weighed and dissolved in deionized water to make solution B. Under continuous stirring, add solutions A and B to a beaker on a water bath at 50°C for precipitation at the same time. After the precipitation is completed, transfer it to a hot kettle, age at 200°C for 8 hours, then filter and wash until PH = 7, and put the filter cake at 120°C Overnight in the oven, 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. Th...

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Abstract

The invention belongs to the technical field of rare-earth phosphate luminescent materials, in particular relates to a rare-earth phosphate luminescent material using ceria as an activating element and a preparation method thereof. The luminescent material comprises components shown as XxXy'Cel-x-Ypo4, wherein X and X' are one of rare-earth elements La, Y and Gd; x is more than or equal to 0 and less than 1; and y is more than and equal to 0 and less than 1. The preparation method comprises the following steps of: precipitating and aging rare-earth precursor solution and diammonium hydrogen phosphate, mixing with a fluxing agent, sintering at high temperature, and reducing to obtain the luminescent material. The fluorescent powder can be excited by ultraviolet rays with the wavelength of between 400 and 500nm, and can emit peak wavelength of 417+ / -1nm, 423+ / -2nm, 425+ / -2nm and 456+ / -1nm along with changes of the components and concentration. The product can be used for an anti-counterfeiting device.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a rare earth phosphate luminescent material with cerium as an active element and a preparation method thereof. Background technique [0002] The ultraviolet-emitting phosphor emits near-ultraviolet light (wavelength 300-380nm) under the excitation of low-pressure mercury vapor powder (wavelength 253.7nm). With different emission wavelengths, it can be used in different occasions. For example, it can be used to make black light powder, mosquito killer lamps, health care lamps and ultraviolet components of fluorescent lamps that imitate sunlight. 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 subject to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 苏振彪
Owner 苏振彪
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