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Red double-perovskite fluorescent powder for white-light LEDs and preparation method of red double-perovskite fluorescent powder

A technology of red phosphor and double perovskite, which is applied in chemical instruments and methods, luminescent materials, gas discharge lamps, etc., can solve the problem of insufficient intensity of the red light emission area, and achieve good color purity and color rendering , good color rendering and high emission intensity

Active Publication Date: 2012-08-15
武汉视美乐激光显示发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the double perovskite system reported above (A 2 B I B II o 6 (B II =Mo or W)) in the fluorescent host material, its A-site ions are +2-valent alkaline earth metal ions such as Ca 2+ 、Sr 2+ 、Ba 2+ etc., the symmetry of the double perovskite structure is strong, and the structure can be cubic, tetragonal or monoclinic according to the transformation of the matrix composition; under near-ultraviolet excitation, Eu 3+ In this type of material, orange light is mainly emitted, and Eu 3+ The red emission of the ultrasensitive transition is suppressed and the intensity of its red emitting region is still insufficient

Method used

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  • Red double-perovskite fluorescent powder for white-light LEDs and preparation method of red double-perovskite fluorescent powder
  • Red double-perovskite fluorescent powder for white-light LEDs and preparation method of red double-perovskite fluorescent powder
  • Red double-perovskite fluorescent powder for white-light LEDs and preparation method of red double-perovskite fluorescent powder

Examples

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Effect test

Embodiment 1

[0032] Example 1 # ((NaLa 0.99 Eu 0.01 )MgMoO 6 ):

[0033] Composition as shown in Table 1 # As shown, the specific preparation method includes the following steps:

[0034] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve ammonium molybdate and EDTA in ammonia solution, and citric acid in deionized water; dissolve ammonium molybdate and EDTA in ammonia solution and metal ion nitrate solution Mix, stir and heat; then adjust the pH of the completely dissolved citric acid solution to 5 with ammonia, then add it to the mixed solution, finally adjust the pH of the solution with ammonia to 7, and the total concentration of all metal ions in the entire solution system is about 1.0 mol / L, the whole process has been stirring and heating, the heating temperature is 35℃;

[0035] ②Place the prepared solution on a magnetic stirrer, stir for 40 minutes and then unpack, heat at 50℃ and keep stirring for about 2.5 hours to form a sol; then increase ...

Embodiment 2

[0041] Example 2 # ((NaLa 0.5Gd0.48 Eu 0.02 )MgWO 6 ):

[0042] Composition as shown in Table 1 2 # As shown, the specific preparation method includes the following steps:

[0043] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve EDTA in the ammonia solution, ammonium tungstate and citric acid in an appropriate amount of deionized water, respectively heat and stir to dissolve; combine the EDTA ammonia solution and metal ion nitric acid Mix the salt solution, stir and heat; then use ammonia to adjust the pH of the completely dissolved citric acid solution to 6 and add it to the mixed solution; finally, use ammonia to adjust the pH of the mixed solution to 8, and add the ammonium tungstate solution. The total concentration of all metal ions in the solution system is about 1.15mol / L, the whole process has been stirred and heated, and the heating temperature is 30℃;

[0044] ②Place the prepared solution on a magnetic stirrer, stir for 30 m...

Embodiment 3

[0048] Example 3 # ((KLa 0.99 Pr 0.01 )MgWO 6 ):

[0049] Composition as shown in Table 1 in 3 # As shown, the specific preparation method includes the following steps:

[0050] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve EDTA in the ammonia solution, ammonium tungstate and citric acid in an appropriate amount of deionized water, respectively heat and stir to dissolve; combine the EDTA ammonia solution and metal ion nitric acid Mix the salt solution, stir and heat; then adjust the pH of the completely dissolved citric acid solution to 7 with ammonia water, then add it to the mixed solution; finally adjust the pH of the solution to 7.5 with ammonia water, and add the ammonium tungstate solution to the mixed solution In the whole solution system, the total concentration of all metal ions is about 1.25mol / L, and the whole process has been stirred and heated at a temperature of 30℃;

[0051] ②Place the prepared solution on a magnetic st...

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Abstract

The invention relates to a red double-perovskite fluorescent powder for white-light LEDs and a preparation method of the red double-perovskite fluorescent powder. The red double-perovskite fluorescent powder is characterized by comprising double-perovskite components shown in the following formula: (AA'1-xMex)MgMO<6>, wherein the A is one of Na or K, the A' is one of La or Gd or composition of the La and the Gd, the M is one of W or Mo or composition of the W and the Mo, the Me is one of rare-earth element Eu or Pr, and the x is larger than or equal to 0.005 and is smaller than or equal to 0.5. The fluorescent powder is prepared by means of sol-gel, single-phase double-perovskite oxide powder can be obtained at the lower temperature and in shorter time, mixing of ions or atoms can be realized by active ions of rare earth, test period is short and stability is fine.

Description

Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a double perovskite red phosphor for white light LEDs and a preparation method thereof. Background technique [0002] As a new type of solid-state lighting device, white LEDs have quickly gained wide application in flat panel display, road lighting and other fields due to their advantages of energy saving, high efficiency, small size, pollution-free and planarization. [0003] The commercially available way to obtain white light is 460nm blue GaN chip excitation Y 3 Al 5 O 12 :Ce 3+ Yellow phosphor, the yellow light emitted by the phosphor and the remaining blue light after the chip is excited to form white light. The weaker red emission in the spectrum causes its color rendering index to be lower. Therefore, it is necessary to mix the same excited red powder in the phosphor. Compensate for red light emission and improve light conversion efficiency; at the same ti...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCY02B20/181Y02B20/00
Inventor 张其土张乐
Owner 武汉视美乐激光显示发展有限公司
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