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Beta-SiAlON:Eu<2+> green fluorescent powder and preparation method thereof

A green phosphor and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of uneven particle size distribution, affecting the qualification rate of final products, etc., and achieve a wide process window, low price, and high luminous intensity. Effect

Active Publication Date: 2016-02-03
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since β-SiAlON:Eu 2+ The uneven particle size distribution of the green phosphor will affect the qualified rate of the final product, so there is an urgent need for suitable β-SiAlON:Eu for backlight materials 2+ green phosphor

Method used

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  • Beta-SiAlON:Eu&lt;2+&gt; green fluorescent powder and preparation method thereof
  • Beta-SiAlON:Eu&lt;2+&gt; green fluorescent powder and preparation method thereof
  • Beta-SiAlON:Eu&lt;2+&gt; green fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] β-SiAlON:Eu 2+ Preparation of green phosphor powder:

[0051] (1) Using α-Si 3 N 4 , AlN, Al 2 o 3 、Eu 2 o 3 As raw material, according to the molar ratio of α-Si 3 N 4 :AlN:Al 2 o 3 :Eu 2 o 3 =1.4:0.1:0.025:0.03 Weighing;

[0052] Note: Weighing of all the above raw materials must be carried out in the glove box N 2 Carry out under air atmosphere (water content<1ppm, oxygen content<1ppm).

[0053] (2) The α-Si 3 N 4 , AlN, Al 2 o 3 、Eu 2 o 3 The raw materials were placed in a corundum mortar and ground in one direction for 0.5h to fully mix the raw materials, then passed through a 50-mesh sieve, and put into a tungsten crucible.

[0054] (3) Put the tungsten crucible into the high-temperature pressure furnace, first pump it with a mechanical pump to an absolute pressure of 5Pa and preheat it to 500°C, and then fill it with N at a rate of 12MPa / h. 2 (purity 99.999%) until the pressure in the furnace is 0.9MPa, at the same time, the temperature is ra...

Embodiment 2-5、7-11

[0059] With respect to embodiment 1, change the size of negative pressure in step (four) (see table 1 for details), other process conditions remain unchanged.

Embodiment 13-16

[0067] Compared with Example 1, the sintering time at 1700° C. in step (4) was changed (see Table 2 for details), and other process conditions remained unchanged.

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Abstract

The invention relates to beta-SiAlON:Eu<2+> green fluorescent powder. The chemical general formula of the beta-SiAlON:Eu<2+> green fluorescent powder is EuaSibAlcOdNe, wherein a is more than 0 and less than or equal to 0.010, b is more than or equal to 0.4 and less than or equal to 0.5, c is more than or equal to 0.01 and less than or equal to 0.02, d is more than or equal to 0.006 and less than or equal to 0.02, and e is more than 0.47 and less than or equal to 0.664. The invention further discloses a preparation process of the fluorescent powder. The preparation process mainly comprises the following steps: firstly sintering at 1900-2200 DEG C for 8-12 hours; then carrying out negative pressure sintering at a negative pressure of 1000Pa-2000Pa for 8-10 hours by virtue of the control of a pressure control pump. The prepared beta-SiAlON:Eu<2+> green fluorescent powder has uniform particles, large average grain diameter and high illumination intensity and has wide prospect in the preparation of a white light LED. The process method is applicable to the large-scale industrial production and has the beneficial effects that the operation is simple and feasible, the raw material cost is low, and a process window is wide; by controlling the process conditions of the pressure control pump, the fluorescent powder with expected particle size and uniformity can be prepared.

Description

technical field [0001] The present invention relates to sialon type green fluorescent powder, specifically a kind of β-SiAlON:Eu 2+ Green fluorescent powder and its preparation method. Background technique [0002] Currently, green phosphors for white LEDs are mostly based on sulfides, such as ZnS: Cu 2+ 、Al 3+ , or SrGa 2 S 4 :Eu 2+ . However, sulfide-based phosphors have low chemical stability, which makes the luminous efficiency of white LEDs highly dependent on temperature, thus limiting their application in the field of white LEDs. The novel oxynitride and nitride photoconverting materials doped with rare earths have attracted extensive attention of researchers because of their good stability and reliability. Therefore, it is particularly necessary to study new green phosphors suitable for white LEDs and LED backlight displays with stable substrates and simple synthesis conditions. In recent years, rare earth-doped new oxynitrides and nitride-based light convers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 杨志平王海龙董秀芹
Owner HEBEI LIFU CHEM TECH
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