NaLaMgWO6:xSm<3+> red phosphor powder for LED (Light Emitting Diode), and preparation method thereof

A technology of red fluorescent powder and powder, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of difficulty in obtaining spherical particles with regular shape, weakened luminous efficiency of fluorescent powder, uneven particle size distribution, etc., and achieves the production cycle Short, good crystallization performance, and uniform particle size

Active Publication Date: 2015-12-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of tungstate by traditional solid phase method, due to the high reaction temperature, long reaction time, uneven particle size distribution, it is difficult to obtain spherical particles with regular shape, and there are easy to exist impurity phases, which weakens the luminous efficiency of phosphors

Method used

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  • NaLaMgWO6:xSm&lt;3+&gt; red phosphor powder for LED (Light Emitting Diode), and preparation method thereof
  • NaLaMgWO6:xSm&lt;3+&gt; red phosphor powder for LED (Light Emitting Diode), and preparation method thereof
  • NaLaMgWO6:xSm&lt;3+&gt; red phosphor powder for LED (Light Emitting Diode), and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) According to the molar ratio of 1.14:1:0.5:1:0.025, weigh NaOH·H 2 O, WO 3 , La 2 o 3 , MgO, Sm 2 o 3 as raw material;

[0029] 2) Put the weighed NaOH·H 2 O is added to the beaker, and an appropriate amount of deionized water is added to it to fully dissolve it, and the NaOH solution and the WO weighed in step 1 3 Put it into the condensing reflux device, keep it warm in a silicone oil bath at 80°C for 6 hours, take it out after cooling to room temperature with the device, dry and grind to obtain powder A;

[0030] 3) The Sm weighed in step 1 2 o 3 Add 10ml of polyvinyl alcohol solution with a concentration of 1%, ultrasonically treat it to make it dispersed evenly, add concentrated nitric acid drop by drop to the dispersion to make Sm 2 o 3 All dissolved (concentrated nitric acid can be slightly excessive), to obtain transparent liquid B;

[0031] 4) the La weighed in step 1 2 o 3 , MgO and the powder A obtained in step 2 are placed in an agate mortar ...

Embodiment 2

[0036]1) According to the molar ratio of 1.18:1:0.5:1:0.025, weigh NaOH·H 2 O, WO 3 , La 2 o 3 , MgO, Sm 2 o 3 as raw material;

[0037] 2) Put the weighed NaOH·H 2 O is added to the beaker, and an appropriate amount of deionized water is added to it to fully dissolve it, and the NaOH solution and the WO weighed in step 1 3 Put it into the condensing reflux device, keep it warm in a silicone oil bath at 75°C for 8 hours, take it out after cooling to room temperature with the device, dry and grind to obtain powder A;

[0038] 3) The Sm weighed in step 1 2 o 3 Add 10ml of polyvinyl alcohol solution with a concentration of 1.5%, ultrasonically treat it to make it disperse evenly, add concentrated nitric acid drop by drop to the dispersion to make Sm 2 o 3 All dissolved (concentrated nitric acid can be slightly excessive), to obtain transparent liquid B;

[0039] 4) the La weighed in step 1 2 o 3 , MgO and the powder A obtained in step 2 are placed in an agate mortar ...

Embodiment 3

[0043] 1) According to the molar ratio of 1.1:1:0.5:1:0.005, weigh NaOH·H 2 O, WO 3 , La 2 o 3 , MgO, Sm 2 o 3 as raw material;

[0044] 2) Put the weighed NaOH·H 2 O is added to the beaker, and an appropriate amount of deionized water is added to it to fully dissolve it, and the NaOH solution and the WO weighed in step 1 3 Put it into the condensing reflux device, keep it warm in a silicone oil bath at 70°C for 10 hours, take it out after cooling to room temperature with the device, dry and grind to obtain powder A;

[0045] 3) The Sm weighed in step 1 2 o 3 Add 10ml of polyvinyl alcohol solution with a concentration of 0.5%, ultrasonically treat it to make it dispersed evenly, add concentrated nitric acid drop by drop to the dispersion to make Sm 2 o 3 All dissolved (concentrated nitric acid can be slightly excessive), to obtain transparent liquid B;

[0046] 4) Put the La2O3 and MgO weighed in step 1 and the powder A obtained in step 2 into an agate mortar and gr...

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Abstract

The invention discloses NaLaMgWO6:xSm<3+> red phosphor powder for an LED (Light Emitting Diode), and a preparation method of the NaLaMgWO6:xSm<3+> red phosphor powder, and belongs to the technical field of preparation of luminescent materials. The NaLaMgWO6:xSm<3+> red phosphor powder for the LED is prepared by using NaOH.H2O, WO3, La2O3, MgO and Sm2O3 as raw materials. The method has the advantages that the raw materials are simple and easily obtained, the operation is simple, the preparation period is short, and the method is pollution-free and suitable for large-scale industrial production. The prepared NaLaMgWO6:xSm<3+> red phosphor powder which is tested and analyzed by an XRD, an SEM and a fluorescence spectrophotometer is higher in purity, high in crystallinity, uniform in grain size and high in dispersity, where x is equal to 0.01 to 0.05; the coverage range of an emission wavelength is 550 to 680nm, the color purity of red light exceeds 92 percent, and the correlated color temperature reaches 1392K.

Description

technical field [0001] The invention belongs to the technical field of preparation of luminescent materials, and relates to a red fluorescent powder and a preparation method thereof, in particular to a NaLaMgWO for LED 6 :xSm 3+ Red fluorescent powder and its preparation method. Background technique [0002] In recent years, white LEDs have attracted extensive attention in lighting, display and other fields because of their advantages such as environmental protection, high efficiency, energy saving, and long life. At present, there are two main ways to obtain white light: one is to excite yellow phosphor powder by a blue light chip; the other is to excite three primary color phosphors from an ultraviolet-near ultraviolet chip to form white light. The former is limited by the lack of red light components in the spectrum, and its color rendering index-based color reproduction is reduced. The latter is currently restricted by the lack of phosphors that can produce efficient r...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 宁青菊曹舒尧姜佳敏史永胜刘波
Owner SHAANXI UNIV OF SCI & TECH
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