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

A red phosphor, double perovskite technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of narrow excitation range and weak intensity, achieve short test period, improved color purity and luminous intensity, and stable Good results

Inactive Publication Date: 2015-06-03
NANJING TECH UNIV
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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 ultraviolet 390-400nm band provides a double-doped double perovskite red phosphor. Another purpose of the present invention is to provide the above-mentioned double-doped double perovskite Preparation method of red fluorescent powder

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
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Effect test

Embodiment 1

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

[0032] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

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

[0034] ②Put the prepared solution on a magnetic stirrer,...

Embodiment 2

[0040] Example 2 # (KGd 0.6 Eu 0.1 SM 0.3 MgO 6 ):

[0041] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0042] 1. Weigh the solid powder raw material according to the composition in Table 1. First, ammonium molybdate and EDTA are dissolved in ammonia solution, and citric acid is dissolved in deionized water; Mix the solution, stir and heat; then adjust the pH=5 of the completely dissolved citric acid solution with ammonia water, then add it to the mixed solution, and finally adjust the solution pH=6 with ammonia water, the total concentration of all metal ions in the whole solution system is about 1.15 mol / L, the whole process has been stirred and heated, and the heating temperature is 35°C;

[0043] ②Put the prepared solution on a magnetic stirrer, stir for 30 minutes, open the seal, heat at 55°C and keep stirring for about 1 hour to form a sol; then increase the heating temperature to 75°C and continue stirring unt...

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 in Table 1 3 # Shown, specific preparation method comprises the following steps:

[0049] ① Weigh the solid powder raw materials according to the composition in Table 1. First, dissolve ammonium molybdate and EDTA in ammonia solution, ammonium tungstate and citric acid are dissolved in deionized water, respectively, and heat and stir to dissolve; ammonium molybdate and EDTA The ammonia solution is mixed with the nitrate solution of metal ions, stirred and heated; then the fully dissolved citric acid solution is adjusted to pH=7 with ammonia, and then added to the mixed solution; finally, the pH of the solution is adjusted to 7 with ammonia, and the 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, and the whole process has been stirred and heated at a temperature of 40°C;

[0050...

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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 light-emitting materials, and relates to a double-doped double perovskite red fluorescent powder and a preparation method thereof. Background technique [0002] White LEDs, as a new type of solid-state lighting device, have been widely used in flat panel display, road lighting and other fields due to their advantages of energy saving, high efficiency, small size, no pollution and planarization. [0003] The currently commercialized way to obtain white light is to excite Y with 460nm blue light GaN chips. 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 combine to form white light, and the weak red emission in the spectrum causes its color rendering index to be low, so it is necessary to mix the same excited red powder into the phosphor to Compensate red light emission and improve light conversion efficiency; at the same time, in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 张乐杨玮民张其土陆洲
Owner NANJING TECH UNIV
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