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A single matrix phosphate white phosphor doped with rare earth ions and transition metal ions and its preparation method

A technology of transition metal ions and rare earth ions, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult to control the particle size of phosphors, lack of red components, cold luminescence color, etc., and achieves wide excitation wavelength range, preparation The effect of short time and high production efficiency

Active Publication Date: 2020-08-25
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used technical solution is the third one. The blue LED used is a gallium nitride diode, and the yellow phosphor with relatively mature technology is YAG:Ce 3+ , it can be effectively excited by 440-480nm blue LED chips, and mixed with blue light to form white light, which has the advantages of high luminous brightness, high electro-optical conversion efficiency, and strong thermal stability, but there are also some obvious disadvantages, such as the lack of red components in the spectrum , leading to higher color temperature, cooler luminous color, poorer color rendering, and difficult to control the particle size of phosphor synthesized by reaction

Method used

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  • A single matrix phosphate white phosphor doped with rare earth ions and transition metal ions and its preparation method
  • A single matrix phosphate white phosphor doped with rare earth ions and transition metal ions and its preparation method
  • A single matrix phosphate white phosphor doped with rare earth ions and transition metal ions and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take each raw material by the following weight: 1.139g of CaCO 3 , 0.039g of SrCO 3 , 0.014g of Eu 2 o 3 , 0.024g of MnCO 3 , 1.068g of NH 4 h 2 PO 4 , 0.228g of CeO 2 , mixed evenly, stirred, and ground for 20 minutes to obtain a mixture;

[0025] (2) Place the ground mixture powder in a small crucible, and 2 with N 2 (H 2 with N 2 Calcined in a reducing atmosphere with a volume ratio of 9:1), raised the temperature to 1200°C at a heating rate of 2°C / min, sintered at this temperature for 8h, and cooled naturally to room temperature to obtain a sintered body;

[0026] (3) After the obtained sintered body is cooled to room temperature, it is fully ground to obtain a single-matrix phosphate white phosphor Ca powder doped with rare earth ions and transition metal ions. 8.58 Sr 0.2 Eu 0.06 mn 0.16 Ce(PO 4 ) 7 .

Embodiment 2-5

[0028] The preparation method of embodiment 2-5 is the same as that of embodiment 1, only the ratio of raw materials is different, and its ratio and the chemical formula of the prepared fluorescent powder are as follows:

[0029] project prepared phosphor CaCO 3 / g

Embodiment 6

[0031] (1) Take each raw material by the following weight: 1.139g of CaCO 3 , 0.052g of BaCO 3 , 0.014g of Eu 2 o 3 , 0.024g of MnCO 3 , 1.068g of NH 4 h 2 PO 4 , 0.228g CeO 2 , mixed evenly, stirred, and ground for 20 minutes to obtain a mixture;

[0032] (2) Place the ground mixture powder in a small crucible, and 2 with N 2 (H 2 with N 2 Calcined in a reducing atmosphere with a volume ratio of 9:1), raised the temperature to 1200°C at a heating rate of 2°C / min, sintered at this temperature for 8h, and cooled naturally to room temperature to obtain a sintered body;

[0033] (3) After the obtained sintered body is cooled to room temperature, it is fully ground to obtain a single-matrix phosphate white phosphor Ca powder doped with rare earth ions and transition metal ions. 8.58 Ba 0.2 Eu 0.06 mn 0.16 Ce(PO 4 ) 7 .

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Abstract

The invention discloses rare earth ion and transition metal ion doped single-matrix phosphate white fluorescent powder. A general chemical formula of the fluorescent powder is Ca<8.78-x-y>Sr<x>Ba<y>Eu<0.06>Mn<0.16>Ce(PO4)7, wherein x is more than or equal to 0 and less than or equal to 1.0, y is more than or equal to 0 and less than or equal to 1.0, and x and y do not simultaneously be 0. A preparation method of the fluorescent powder comprises the following steps: (a) weighing oxide, carbonate or phosphate which contains Ca, Sr, Ba, Eu, Mn, Ce and P according to the molar ratio thereof in the general chemical formula of the fluorescent powder, mixing, stirring, and grinding, so as to obtain a mixture; (b) heating and roasting the mixture in a reducing atmosphere, so as to obtain a sintered body; and (c) cooling the sintered body to room temperature, and adequately grinding. The white fluorescent powder prepared is wide in excitation wavelength range and high in luminescent intensity, can be effectively excited by ultraviolet waves in a specific ultraviolet wavelength, can emit bright white light and has good heating stability; and by utilizing a high temperature solid phase method, a preparation process is simple, easy in operation and control, high in safety, short in preparation time, high in production efficiency and applicable to large-scale industrial production and application.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method, in particular to a single matrix phosphate white fluorescent powder doped with rare earth ions and transition metal ions and a preparation method thereof. Background technique [0002] White LED (Light Emitting Diode, Light Emitting Diode) is considered to be the fourth-generation solid-state lighting source to replace traditional incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. LED devices have the advantages of energy saving, high efficiency, environmental protection, small size, long service life, high reliability, and intelligent control, and are widely used in various lighting and display fields. [0003] At present, there are four main ways for LEDs to achieve white light emission: (1) LED chips that emit red light, green light and blue light are combined together, so that the red, green and blue lights are superimposed to form white light; (2) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/81
CPCC09K11/7796
Inventor 王超李盼来王志军杨志平
Owner HEBEI UNIVERSITY
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