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Fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and preparation method thereof

A nitrogen oxide, fluorescence enhancement technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems affecting the process of commercialization, the reduction of white LED efficiency, low fluorescence brightness, etc., and achieve chemical stability and thermal stability. Improve the effect of large-scale continuous production and high reactivity

Inactive Publication Date: 2018-02-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And BaSi 2 o 2 N 2 :Eu 2+ The main problem of nitrogen oxide materials is that their fluorescent brightness is not high, which leads to the reduction of the efficiency of white LEDs packaged in them, which seriously affects their commercialization process.

Method used

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  • Fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and preparation method thereof
  • Fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and preparation method thereof
  • Fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and preparation method thereof

Examples

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preparation example Construction

[0040] The preparation method of the fluorescence-enhanced silicon-based oxynitride cyan fluorescent powder of the present invention comprises the following steps:

[0041] Step 1, according to the stoichiometric ratio of the precursor to be prepared, weigh the solid compound of Ba and / or the simple substance of Ba, the solid compound of Si and / or the simple substance of Si, the solid compound of Eu and / or the simple substance of Eu, the solid compound of M and / or M simple substance, R solid compound and / or R simple substance, A solid compound and / or A simple substance, after mixing the above materials evenly, the resulting mixture is sintered at 1100°C-1300°C for 2-6h in an atmosphere, and cooled After reaching room temperature, grind, obtain precursor (Ba 1-x'-y'-z'-m' m x' R y' A z' ) 2 SiO 4 :m'Eu 2+ , where x', y', z' and m' are mole fractions, and the range of values ​​is x'≤x, y'≤y, z'≤z, m'≤m;

[0042] In step 1, when Ba, Si, Eu, M, R, and A elements are added ...

Embodiment 1

[0054] (Ba 0.94 Dy 0.01 Li 0.01 )O 0.5SiO 2 0.5Si 3 N 4 :0.04Eu 2+ Preparation of:

[0055] Step 1, according to chemical formula Ba 1.92 SiO 4 :0.08Eu 2+ The stoichiometric ratio of BaCO 3 , SiO 2 and Eu 2 o 3 , after mixing the above materials evenly, the resulting mixture was sintered at 1200°C under a reducing atmosphere of hydrogen for 6h, cooled to room temperature and then ground to obtain the precursor Ba 1.92 SiO 4 :0.08Eu 2+ ;

[0056]Step two, according to (Ba 0.94 Dy 0.01 Li 0.01 )O 0.5SiO 2 0.5Si 3 N 4 :0.04Eu 2+ The stoichiometric ratio, weigh the precursor 0.5171g, Si powder 0.1264g, Eu 2 o 3 0.0013g, Li 2 CO 3 0.0011g, Dy 2 o 3 0.0056g, put the weighed material into a mortar and grind and mix to obtain a uniform mixture powder, place the mixture powder in a pressure furnace, heat up to 1400°C and sinter under a high-purity nitrogen atmosphere of 1MPa for 6h, After cooling to room temperature, grind to obtain silicon-based oxynitride...

Embodiment 2-39

[0058] The preparation process is the same as that of Example 1. The chemical formula of the cyan phosphor, the chemical formula of the precursor, the raw materials used, and the preparation process conditions of each example are shown in Table 1.

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Abstract

The invention discloses a fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and a preparation method thereof, and belongs to the technical field of luminescent material. Thepreparation method is used for solving a problem in the prior art that the fluorescent brightness of BaSi<2>O<2>N<2>:Eu<2+> nitrogen oxide is low. The chemical formula of the fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder is (Ba<1-x-y-z-m>M<x>R<y>A<z>)O*0.5SiO<2>*0.5Si<3>N<4>:mEu<2+>, wherein 0.01<=m<=0.05, 0<=x<=0.2, 0.005<=y<=0.2, 0.5<=y / z<=1, 0<x+y+z<0.5, R is used for representing at least one element selected from La, Y, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Pr, and Mn, M is used for representing at least one element selected from Ca, Sr, and Mg, A is used for representing at least one element selected from K, Na, and Li. The fluorescent brightness of the fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder is high, and the excitation peak value is stabilized at 490 to 500nm under blue light excitation.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a silicon-based nitrogen oxide cyan fluorescent powder with enhanced fluorescence and a preparation method thereof. Background technique [0002] Due to its long life, high luminous efficiency, energy saving, environmental protection and other characteristics, LED is widely used in various lighting fields. So far, commercial white LEDs mainly use In-GaN blue LED chips and garnet-structured (YAG:Ce 3+ ) yellow phosphors are combined with each other, but due to the lack of red and cyan light components, the color rendering index of this white LED is very low (Ra<80), which limits the application field of white LED. Although the method of adding yellow phosphor to blue light chips is not perfect, it is still the main commercialization method in the market due to its simple preparation and low energy consumption. [0003] At present, some progress has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
Inventor 张亮亮贺帅张家骅张霞郝振东潘国徽武华君
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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