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Phosphate green emitting phosphor and preparation method thereof

A green phosphor, phosphate technology, applied in chemical instruments and methods, phosphorus compounds, luminescent materials, etc., can solve problems such as short life, affecting structural stability, charge imbalance, etc., to reduce surface or performance, improve resistance. Oxidative, reducing agglomeration effect

Inactive Publication Date: 2010-07-07
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (La, Ce, Tb) PO is mentioned in the patent document US5746944 4 Li, Na, K, Th, B and other elements can be included in the doping, but this single doping will inevitably cause charge imbalance, affect the stability of the structure, and will also cause problems such as short lifetime in luminescence.

Method used

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  • Phosphate green emitting phosphor and preparation method thereof
  • Phosphate green emitting phosphor and preparation method thereof
  • Phosphate green emitting phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Press Li 0.06 Na 0.06 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.04 The stoichiometric ratio was weighed La 2 o 3 (4N), CeO 2 (4N), Tb 4 o 7 (4N), (NH 4 ) 2 HPO 4 (AR), Li 2 CO 3 (AR), Na 2 CO 3 (AR), after mixing the above raw materials evenly, reduce and roast at 1000°C for 2 hours, break the roasted product, then wash with water until the conductivity remains unchanged, filter, dry at 120°C, and pass through a 80-mesh dry sieve to obtain the component for Li 0.06Na 0.06 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.04 green phosphor.

Embodiment 2

[0066] Precursor La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) as raw material, press Na in the precursor powder 0.02 K 0.01 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.01 The stoichiometric ratio of adding Na 2 CO 3 (AR), K 2 CO 3 (AR) and (NH 4 ) 2 HPO 4 (AR), after mixing evenly, the mixture was passed through N at 1000°C 2 Roast for 2 hours, then crush the roasted product, then wash with water until the conductivity remains unchanged, filter, dry at 120°C, and pass through a 802-mesh dry sieve to obtain the composition Na 0.02 K 0.01 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.01 green phosphor.

Embodiment 3

[0068] precursor Zn 0.3 Al 0.1 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.3 As a raw material, the precursor was passed through N at 1000 °C 2 Roast for 2 hours, then wash the roasted product with water until the conductivity remains unchanged, filter, and dry at 120°C to obtain a composition of Zn 0.3 Al 0.1 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.3 green phosphor.

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Abstract

The invention obtains a green emitting phosphor MaLnxCeyTbl-x-y(PO4)nXb by doping ions, wherein, M is at least one of Li, Na, K, Zn and Al elements, Ln is at least one of La, Y and Gd elements, X is at least one of F and Cl elements, x is more than or equal to 0.4 and less than or equal to 0.7, y is more than or equal to 0.2 and less than or equal to 0.45, x+y is less than 0.95, a is more than orequal to 0 and less than or equal to 0.4, b is is more than or equal to 0 and less than or equal to 0.6, and a and b are not equal to 0 at the same time. The surface of emitting phosphor grains is smooth, powder grain diameter is appropriate in size, gain distribution is narrow, thermal stability is good, and luminous efficiency is high.

Description

technical field [0001] The invention relates to a high-efficiency phosphate green fluorescent powder which can be widely used in cold-cathode lamps and energy-saving lamps, has a specific shape, a dispersion coefficient, and good thermal stability, and a preparation method thereof. Background technique [0002] Since the advent of rare-earth tri-color phosphors in 1974, aluminates have always occupied a dominant position in tri-color phosphors. However, as Japan, the Netherlands and other countries have successively developed phosphate-based rare earth three-color phosphors, the monopoly of aluminate-based phosphors has been broken, and phosphate-based phosphors have been developed and flourishing. In particular, large companies such as Nichia and Chemical have replaced aluminate-based phosphors with phosphate-based phosphors in cold-cathode lamp phosphors. [0003] Compared with the aluminate-based three-color phosphor, the phosphate-based phosphor has further improved qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86C01B25/455
Inventor 胡晓珊胡运生庄卫东张顺利龙志奇赵春雷何华强黄小卫
Owner GRIREM ADVANCED MATERIALS CO LTD