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NaSr2Nb5O15:xEu<3+> red phosphor used for blue LED (light-emitting diode) chip and preparation method for NaSr2Nb5O15:xEu<3+> red phosphor

A technology of red phosphor and blue light chip, which is applied in the field of red phosphor and its preparation, can solve the problems of complex chemical reaction, large particle size, and high purity requirements, and achieve the effect of simple operation

Inactive 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

Phosphor powder prepared by solid-phase method has high sintering temperature, large particle size, uneven particle size distribution, difficult to obtain spherical particles, and difficult to coat; chemical precipitation method requires high purity of raw materials, and chemical reactions during the preparation process Complex, easy to introduce impurities, thus affecting the luminescent performance of phosphors; the hydrothermal method has great limitations because it is only suitable for the preparation of oxides or a small number of sulfides that are not sensitive to water

Method used

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  • NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor used for blue LED (light-emitting diode) chip and preparation method for NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor
  • NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor used for blue LED (light-emitting diode) chip and preparation method for NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor
  • NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor used for blue LED (light-emitting diode) chip and preparation method for NaSr2Nb5O15:xEu&lt;3+&gt; red phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) According to the molar ratio of 2:2.875:0.01, weigh Sr(NO 3 ) 2 , Nb 2 o 5 、Eu 2 o 3 The raw materials are placed in an agate mortar, and the raw materials are ground at room temperature for 30 minutes to mix the raw materials evenly;

[0027] 2) According to the molar ratio of 1.5:0.75:1:1.3, weigh NaCl and NaCl respectively 2 CO 3 、KNO 3 , KCl is placed in an agate mortar as a molten salt, and the molten salt is ground at room temperature for 30 minutes, so that the two salt materials are evenly mixed;

[0028] 3) According to the mass ratio of 2.5:1, weigh the raw material powder obtained in step 1 and the molten salt obtained in step 2, respectively, and place them in an agate mortar, grind the mixture at room temperature for 30 minutes, so that the raw materials and molten salt are uniformly mixed;

[0029] 4) Put the mixture in step 3 in a crucible and place it in a box-type resistance furnace. From room temperature, raise the temperature to 150°C at a ...

Embodiment 2

[0033] 1) According to the molar ratio of 2:2.75:0.02, weigh the Sr(NO 3 ) 2, Nb 2 o 5 、Eu 2 o 3 The raw materials are placed in an agate mortar, and the raw materials are ground at room temperature for 30 minutes to mix the raw materials evenly;

[0034] 2) According to the molar ratio of 1:0.5:1:1, weigh NaCl and NaCl respectively 2 CO 3 、KNO 3 , KCl is placed in an agate mortar as a molten salt, and the molten salt is ground at room temperature for 30 minutes, so that the two salt materials are evenly mixed;

[0035] 3) According to the mass ratio of 3.5:1, weigh the raw material powder obtained in step 1 and the molten salt obtained in step 2, respectively, and place them in an agate mortar, grind the mixture at room temperature for 30 minutes, so that the raw materials and molten salt are uniformly mixed;

[0036] 4) Put the mixture of step 3 in a crucible and place it in a box-type resistance furnace. From room temperature, heat up to 200°C at a rate of 2°C / min, ...

Embodiment 3

[0040] 1) According to the molar ratio of 2:3:0.025, weigh Sr(NO 3 ) 2 , Nb 2 o 5 、Eu 2 o 3 The raw materials are placed in an agate mortar, and the raw materials are ground at room temperature for 30 minutes to mix the raw materials evenly;

[0041] 2) According to the molar ratio of 1.5:0.5:1:1.1, weigh NaCl and NaCl respectively 2 CO 3 、KNO 3 , KCl is placed in an agate mortar as a molten salt, and the molten salt is ground at room temperature for 30 minutes, so that the two salt materials are evenly mixed;

[0042] 3) According to the mass ratio of 0.5:1, respectively weigh the raw material powder obtained in step 1 and the molten salt obtained in step 2 and place them in an agate mortar, and grind the mixture at room temperature for 30 minutes, so that the raw materials and molten salt are evenly mixed;

[0043] 4) Put the mixture of step 3 in a crucible and place it in a box-type resistance furnace. From room temperature, heat up to 180°C at a rate of 2°C / min, th...

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Abstract

The invention discloses NaSr2Nb5O15:xEu<3+> red phosphor used for a blue LED (light-emitting diode) chip and a preparation method for the NaSr2Nb5O15:xEu<3+> red phosphor, and belongs to the technical field of luminescent material preparation. According to the preparation method for the NaSr2Nb5O15:xEu<3+> red phosphor, disclosed by the invention, by taking Sr(NO3)2, Nb2O5 and Eu2O3 as raw materials and NaCl, Na2CO3, KNO3 and KCl as molten salt, after grinding and mixing, molten salt method preparation of NaSr2Nb5O15:Eu<3+> powder is realized at lower temperature (in comparison with the temperature of a solid phase method). The method is simple in operation, greening and environmental friendly, and is suitable for industrial scale production. The NaSr2Nb5O15:Eu<3+> powder prepared by the molten salt method of the invention reaches up to 100 percent in purity, is good in crystallization property, even in particle size and good in dispersibility; the average particle size is 8 to 10mum; the main excitation peak of the excitation spectrum of the NaSr2Nb5O15:Eu<3+> powder is located at 466nm (blue-light area), showing that the NaSr2Nb5O15:Eu<3+> powder can be excited by blue light very well and is matched with the blue chip; the purity of red color emitted from the NaSr2Nb5O15:Eu<3+> powder reaches up to more than 90 percent.

Description

technical field [0001] The invention belongs to the technical field of luminescent material preparation, and relates to a red fluorescent powder and a preparation method thereof, in particular to a NaSr powder for blue light chip LED. 2 Nb 5 o 15 :xEu 3+ Red fluorescent powder and its preparation method. Background technique [0002] At present, there are two main ways for LEDs to emit white light: one is to use blue light chips to excite yellow phosphors, and use the remaining blue light and yellow light to combine to achieve white light emission; the other is to use ultraviolet-near ultraviolet chips to excite red phosphors. Green and blue three-primary-color phosphor powder, which realizes white light emission through the combination of three-primary color light. However, due to the lack of red light components, the former has a low color rendering index and poor color reproduction, while the latter is prone to reabsorption among phosphors of various colors, which aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
Inventor 宁青菊曹舒尧姜佳敏史永胜于成龙刘波
Owner SHAANXI UNIV OF SCI & TECH