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Double-doped double perovskite red phosphor and preparation method of double-doped double perovskite red phosphor

A technology of red phosphor and double perovskite, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as weak intensity and narrow excitation range, achieve color purity and luminous intensity improvement, short test cycle, and stability Good results

Inactive Publication Date: 2013-06-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is aimed at the existing double perovskite red phosphor system (AA'MgB Ⅱ o 6 :Eu(B Ⅱ =Eu in Mo or W)) 3+ The problem of narrow excitation range and weak intensity of ions in the near u

Method used

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  • Double-doped double perovskite red phosphor and preparation method of double-doped double perovskite red phosphor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 # (NaGd 0.65 Eu 0.05 Bi 0.3 MgWO 6 ):

[0032] Composition as shown in Table 1 # As shown, the specific preparation method includes the following steps:

[0033] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve EDTA in ammonia solution, ammonium tungstate and citric acid in deionized water, and heat and stir to dissolve them; combine EDTA ammonia solution and metal ion nitrate The solution is mixed, stirred and heated; then the completely dissolved citric acid solution is adjusted to pH=6 with ammonia water, and then added to the mixed solution; finally, the pH of the mixed solution is adjusted to 7 with ammonia water, and the ammonium tungstate solution is added to the whole solution The total concentration of all metal ions in the system is about 1.00mol / L. The whole process has been stirred and heated, and the heating temperature is 30°C;

[0034] ②Place the prepared solution on a magnetic stirrer, stir for 40 minutes...

Embodiment 2

[0040] Example 2 # (KGd 0.6 Eu 0.1 Sm 0.3 MgMoO 6 ):

[0041] Composition as shown in Table 1 2 # As shown, the specific preparation method includes the following steps:

[0042] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve ammonium molybdate and EDTA in an aqueous ammonia solution, and dissolve citric acid in deionized water; combine the ammonia solution of ammonium molybdate and EDTA and the nitrate of metal ions The solution is mixed, stirred and heated; then the completely dissolved citric acid solution is adjusted to pH=5 with ammonia water, and then added to the mixed solution. Finally, the solution pH=6 is adjusted with ammonia water. The total concentration of all metal ions in the entire solution system is about 1.15 mol / L, the whole process has been stirred and heated, and the heating temperature is 35°C;

[0043] ②Place the prepared solution on a magnetic stirrer, stir for 30 minutes and unpack it, heat it at 55°C and keep...

Embodiment 3

[0047] Example 3 # (NaGd 0.6 Eu 0.3 Bi 0.1 Mg(W 0.5 Mo 0.5 )O 6 ):

[0048] Composition as shown in Table 1 in 3 # As shown, the specific preparation method includes the following steps:

[0049] ①Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve ammonium molybdate and EDTA in the ammonia solution. Dissolve ammonium tungstate and citric acid in deionized water, respectively, heat and stir to dissolve; combine ammonium molybdate and EDTA The ammonia solution is mixed with the metal ion nitrate solution, stirred and heated; then the completely dissolved citric acid solution is adjusted to pH=7 with ammonia, and then added to the mixed solution; finally, the solution is adjusted to pH=7 with ammonia, and Ammonium tungstate solution is added to the mixed solution, the total concentration of all metal ions in the whole solution system is about 1.25mol / L, the whole process has been stirred and heated, and the temperature is 40°C;

[0050] ②Place...

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Abstract

The invention relates to a double-doped double perovskite red phosphor and a preparation method of the double-doped double perovskite red phosphor. The structure formula is shown as (AGd(1-x-y)EuxLny)MgMO6, wherein A is one of Na or K; Ln is one of Bi or Sm; M is at least one of W or Mo; x is greater than or equal to 0.05 and less than or equal to 0.5; and y is greater than or equal to 0.05 and less than or equal to 0.3. The double-doped double perovskite red phosphor is prepared through a sol-gel method; according to the invention, elements comprising Eu and Ln are doubly doped in matrixes of molybdate and tungstate of a double perovskite structure; the absorption width of Eu<3+> ion in a wave band of 0-400nm through the wideband absorption of Bi<3+> or Sm<3+> ion in a nearly ultraviolet region; and both the color purity and the luminous strength of the Eu<3+> ion are improved through an existing energy transfer process. A single-phase double perovskite oxide powder can be acquired by the preparation method under the conditions of low temperature and short insulation time; the mixture at an iron or atom level can be realized by activating ions by using rare earth; and the test period is short and the stability is good.

Description

Technical field [0001] The invention belongs to rare earth luminescent materials, and relates to a double-doped double perovskite red fluorescent powder 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 displays, 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 time, among the red, g...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 张乐杨玮民张其土陆洲
Owner NANJING UNIV OF TECH
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