Red fluorescent powder, preparation method thereof and luminescent device prepared therefrom

A technology for red phosphors and light-emitting devices, applied in the directions of light-emitting materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of slow development, difficult phosphor synthesis, harsh synthesis conditions, etc., and achieve convenient industrial production and effective excitation range. Wide, easy-to-synthesize effects

Inactive Publication Date: 2013-03-27
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the synthesis of this type of phosphor is difficult, the synthesis conditions are harsh, and the current development is relatively slow.

Method used

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  • Red fluorescent powder, preparation method thereof and luminescent device prepared therefrom
  • Red fluorescent powder, preparation method thereof and luminescent device prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the chemical formula of phosphor Ca 0.9 sc 2 o 4 :Eu 0.1 Weigh 0.018mol CaCO 3 , 0.02mol Sc 2 o 3 , 0.001mol Eu 2 o 3 , and adding 1% H in phosphor weight 3 BO 3 flux. After fully mixing and grinding evenly, bake in a reducing atmosphere at 1550°C for 4 hours. After crushing, grading, washing, drying and sieving of the roasted product, the composition can be obtained as Ca 0.9 sc 2 o 4 :Eu 0.1 of red phosphor. Its excitation and emission spectra are as figure 1 , 2 shown. It can be seen that the excitation peak of the excitation spectrum is relatively broad, and the excitation effect of light with a wavelength in the range of 350-550nm is better. Its emission is a broad-spectrum emission, and the main peak is located at 640nm, showing strong red emission.

Embodiment 2

[0039] According to the chemical formula of phosphor Ca 0.65 Sr 0.1 sc 2 o 4.025 :Eu 0.2 , Dy 0.05 Weigh 0.013mol Ca(OH) 2 , 0.002mol Sr(NO 3 ) 2 , 0.02mol Sc 2 o 3 , 0.004mol Eu(NO 3 ) 3 ·6H 2 O, 0.0005mol Dy 2 o 3 , while adding 0.5% CaF by phosphor weight 2 Flux, after mixing and grinding evenly, bake in a reducing atmosphere at 1650°C for 2 hours. After crushing, grading, washing, drying and sieving of the roasted product, the composition can be obtained as Ca 0.65 Sr 0.1 sc 2 o 4.025 :Eu 0.2 , Dy 0.05 The main peak of the broad-peak emission of the phosphor is located at 642nm.

Embodiment 3

[0041] According to the chemical formula of phosphor CaMg 0.02 sc 2.2 al 0.1 o 4.475 :Eu 0.005 Weigh 0.02mol CaC 2 o 4 ·H 2 O, 0.0004mol (as Mg) Mg(OH) 2 · 3MgCO 3 0.3H 2 O, 0.044mol ScCl 3 , 0.004molAlOOH, 0.0001molEuF 3 , and adding 10% NH by phosphor weight to it 4 Cl flux. After fully mixing and grinding evenly, it is first calcined in a reducing atmosphere at 1100°C for 4 hours, and then calcined in a reducing atmosphere at 1400°C for 6 hours. The composition of the calcined product is CaMg after crushing, grading, washing, drying and sieving. 0.02 sc 2.2 al 0.1 o 4.475 :Eu 0.005 The main peak of the broad-peak emission of the phosphor is located at 630nm.

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Abstract

The invention relates to red fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light, a preparation method thereof and a luminescent device prepared from the red fluorescent powder. The fluorescent powder has the following chemical formula: M1aM2bOc:Eud, wherein M1 is at least one of Ca, Sr, Ba, Zn and Mg; M2 is at least one of Sc, Al, Ga, Y, La, Gd and Lu; R is one or more of Dy, Tm, Tb and Pr; a is more than or equal to 0.7 and less than or equal to 1.2; b is more than or equal to 1.6 and less than or equal to 2.4; c is more than or equal to 3.2 and less than or equal to 4.8; d is more than or equal to 0.005 and less than or equal to 0.2; and e is more than or equal to 0 and less than or equal to 0.1. After all the raw materials and a fusing assistant are uniformly mixed and milled; the powder is roasted at a high temperature under a reducing atmosphere; and the roasted powder is processed to form the fluorescent powder. The fluorescent powder has the characteristics of high chemical stability, wide effective excitation range, wide emission coverage range and the like, is simple in manufacturing method and low in cost, is easy to industrialize, and can be manufactured into the luminescent device when matched with an ultraviolet light, purple light or blue light light-emitting diode (LED) lamp.

Description

technical field [0001] The invention relates to a red fluorescent powder that can be effectively excited by ultraviolet light, purple light or blue light, a preparation method thereof, and a light-emitting device made of the red fluorescent powder. Background technique [0002] Red phosphor is mainly used to adjust the light color parameters of the application products. In the production of white LEDs, red phosphor is not only used to compensate for the lack of red in "blue LED+YAG:Ce", it can also be used with blue LEDs and green phosphors to produce white light, or with green and blue phosphors And purple or ultraviolet LED to produce white light. There are many red phosphors for LEDs that have been reported at present, but they have not formed a mainstream product, mainly some Eu 2+ / Eu 3+ or Mn 4+ Activated phosphors, typically (Ca, Sr)S:Eu 2+ , Y 2 o 3 :Eu 3+ , Bi 3+ , Y 2 o 2 S:Eu 3+ , Bi 3+ , Y(V,P)O 4 :Eu 3+ 、CaMoO 4 :Eu 3+ etc., where (Ca, Sr)S:Eu ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80C09K11/78H01L33/48H01L33/50
Inventor 胡运生刘元红庄卫东高文贵何华强
Owner GRIREM ADVANCED MATERIALS CO LTD
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