High-lighting-effect and high-stability alpha-SiAlON:Eu<2+> yellow fluorescent powder and preparation method thereof

A technology of yellow phosphor and high stability, which is applied in the field of yellow phosphor and its preparation, which can solve the problems of poor stability and insufficient brightness of yellow phosphor, and achieve increased crystallinity, thermal quenching and high temperature and high humidity resistance The effect of stability improvement and size increase

Inactive Publication Date: 2017-08-18
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a high light efficiency, high stability α-SiAlON:Eu 2+ Yellow phosphor to solve existing α-SiAlON:Eu 2+ Insufficient brightness and poor stability of yellow phosphor

Method used

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  • High-lighting-effect and high-stability alpha-SiAlON:Eu&lt;2+&gt; yellow fluorescent powder and preparation method thereof
  • High-lighting-effect and high-stability alpha-SiAlON:Eu&lt;2+&gt; yellow fluorescent powder and preparation method thereof
  • High-lighting-effect and high-stability alpha-SiAlON:Eu&lt;2+&gt; yellow fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Si 9.6 (Ca 0.15 Ti 0.85 ) 1.2 (Al 0.35 In 0.65 ) 2.4 o 0.2 N 15.8 : 0.06Eu 2+ Preparation of yellow phosphor powder:

[0030] (1) According to Si 3 N 4 : Ca 3 N 2 :AlN:TiO 2 : In 2 o 3 :Eu 2 o 3 = 3.20: 0.06: 0.84: 1.02: 0.78: 0.03 molar ratio respectively weighs the corresponding amount of Si 3 N 4 , Ca 3 N 2 , AlN, TiO 2 、In 2 o 3 and Eu 2 o 3 As raw material; weigh CaCl 2 As a sintering aid, its dosage is 1% of the total mass of raw materials.

[0031] Note: All the above raw materials and additives need to be weighed in the glove box N 2 Under the atmosphere (water content 3 N 2 ) absorbs water and oxygen severely, resulting in changes in its chemical properties.

[0032] (2) Put the weighed raw materials and auxiliary agents into a corundum mortar and make them fully mix, then pass through a 50-mesh sieve, and put them into a W crucible (the melting point of the W crucible is higher than 3000°C, which can meet the requirements of use, ...

Embodiment 2～10、 comparative example 2

[0041] According to the process conditions and steps in Example 1, the types and doping amounts of M1 and M2 were changed to prepare different phosphors. The prepared fluorescent powder was tested with a HASS2000 high-precision fast spectroradiometer, and the results are shown in Table 1.

[0042] Table 1:

[0043]

[0044]

Embodiment 11～17

[0046] According to the process conditions and steps in Example 1, the types of additives used were changed to prepare phosphors. Adopt HASS2000 high-precision fast spectroradiometer to test the prepared fluorescent powder, the obtained results are shown in Table 2, in the table, D50 is the central particle diameter of the obtained fluorescent powder, K is the particle size distribution coefficient, and its calculation method is K=( D90-D10) / D50.

[0047] Table 2:

[0048] Example number Additive type relative brightness wxya peak wavelength D50(μm) K Example 11 NaF 175.2 90.1 573.4 0.82 1.23 Example 12 KF 173.2 90.2 573.4 0.95 1.20 Example 13 AlF 3

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Abstract

The invention provides high-lighting-effect and high-stability alpha-SiAlON:Eu<2+> yellow fluorescent powder and a preparation method thereof. The chemical general formula of the fluorescent powder is Si12-2a(CayM11-y)a(AlxM21-x)2aObN16-b:mEu<2+>, wherein M1 represents at least one element of Na, K, Ba, Sr, Ti, Ge and Sn, M2 represents at least one element of Ga, B and In, a is more than or equal to 0.05 and less than or equal to 2.50, b is more than or equal to 0.01 and less than or equal to 0.30, x is more than 0 and less than 1, and y is more than 0 and less than 1. The fluorescent powder is prepared through high-temperature solid-phase sintering, is stable in structure and high in lighting efficiency, has good stability in practical application and can be applied to high-color-temperature and warm-white LEDs.

Description

technical field [0001] The invention relates to a yellow fluorescent powder and a preparation method thereof, in particular to a high-efficiency, high-stability α-SiAlON:Eu 2+ Yellow fluorescent powder and preparation method thereof. Background technique [0002] SiAlON phosphor is a kind of oxynitride phosphor mainly including four chemical elements Si, Al, O, and N. Its crystal structure is similar to that of Si 3 N 4 similar. In the Si-Al-O-N quaternary system, due to the cation M(Si 4+ 、Al 3+ ) and anion X (N, O) in different proportions, the solid solutions formed are also different, mainly α-SiAlON, β-SiAlON, O-SiAlON, X-SiAlON and AlN polytypes (8H, 12H, 15R, 21R, 27R, etc.) of the four types, the former two are the most common, and most of them are ceramic materials. The general formula of α-SiAlON is Me x Si 12-(m+n) al m+n o n N 16-n , where: x≤2, m represents the number of (Si-N) bonds replaced by (Al-N) bonds, n is the number of (Si-N) bonds replaced b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67C09K11/66C09K11/62
CPCC09K11/7734C09K11/7735C09K11/774
Inventor 杨志平王海龙赵金鑫
Owner HEBEI LIFU CHEM TECH
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