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Europium-doped barium magnesium niobate (BMN) red phosphor and preparation method thereof

A technology of red fluorescent powder and barium magnesium niobate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve problems such as shortage, and achieve the effects of uniform particle size, high chemical stability, and good color purity

Active Publication Date: 2019-05-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the lack of ideal red fluorescent powder at present, the present invention uses barium magnesium niobate as the matrix material, utilizes its hexagonal ordered structure to provide an ideal asymmetric lattice environment for europium ions, and prepares a new type of high-efficiency red fluorescent powder

Method used

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  • Europium-doped barium magnesium niobate (BMN) red phosphor and preparation method thereof
  • Europium-doped barium magnesium niobate (BMN) red phosphor and preparation method thereof
  • Europium-doped barium magnesium niobate (BMN) red phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Prepare peroxygen-Nb-citric acid solution: weigh 0.02mol Nb at a molar ratio of 1:20 2 o 5 and 0.4mol KOH, mixed and ground, poured into a crucible, heated up to 550°C at a rate of 5°C per minute, kept for 2.5h, slowly added water to dissolve, transferred to a beaker and stood for a day and a night, filtered to take the supernatant, and added Adjust the pH value to 1-2 with hydrochloric acid, let it stand for a period of time, add ultrapure water to filter, and completely remove Cl -1 , to get niobate colloid (Nb 2 o 5 ·5H 2 O), then follow Nb:citric acid:H 2 o 2 =1:4:10 ratio of citric acid and hydrogen peroxide were added sequentially, and the volume was adjusted to 200ml with ultrapure water, heated and stirred at 65°C for 5-10h, evaporated and concentrated to 100ml, and peroxy-Nb-citric acid solution was obtained. Weigh an appropriate amount of precursor solution, calcined, and determine the actual content of Nb;

[0029] 2) Take an appropriate amount of e...

Embodiment 2

[0033] 1) Prepare peroxygen-Nb-citric acid solution: weigh 0.02mol Nb at a molar ratio of 1:20 2 o 5 and 0.4mol KOH, mixed and ground, poured into a crucible, heated up to 550°C at a rate of 5°C per minute, kept for 2.5h, slowly added water to dissolve, transferred to a beaker and stood for a day and a night, filtered to take the supernatant, and added Adjust the pH value to 1-2 with hydrochloric acid, let it stand for a period of time, add ultrapure water to filter, and completely remove Cl -1 , to get niobate colloid (Nb 2 o 5 ·5H 2 O), then follow Nb:citric acid:H 2 o 2 =1:4:10 ratio of citric acid and hydrogen peroxide were added sequentially, and the volume was adjusted to 200ml with ultrapure water, heated and stirred at 65°C for 5-10h, evaporated and concentrated to 100ml, and peroxy-Nb-citric acid solution was obtained. Weigh an appropriate amount of precursor solution, calcined, and determine the actual content of Nb;

[0034] 2) Take an appropriate amount of e...

Embodiment 3

[0038] 1) Prepare peroxygen-Nb-citric acid solution: weigh 0.02mol Nb at a molar ratio of 1:20 2 o 5 and 0.4mol KOH, mixed and ground, poured into a crucible, heated up to 550°C at a rate of 5°C per minute, kept for 2.5h, slowly added water to dissolve, transferred to a beaker and stood for a day and a night, filtered to take the supernatant, and added Adjust the pH value to 1-2 with hydrochloric acid, let it stand for a period of time, add ultrapure water to filter, and completely remove Cl -1 , to get niobate colloid (Nb 2 o 5 ·5H 2 O), then follow Nb:citric acid:H 2 o 2 =1:4:10 ratio of citric acid and hydrogen peroxide were added sequentially, and the volume was adjusted to 200ml with ultrapure water, heated and stirred at 65°C for 5-10h, evaporated and concentrated to 100ml, and peroxy-Nb-citric acid solution was obtained. Weigh an appropriate amount of precursor solution, calcined, and determine the actual content of Nb;

[0039] 2) Take an appropriate amount of e...

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Abstract

The invention belongs to the field of light-emitting materials, and particularly relates to europium-doped barium magnesium niobate (BMN) red phosphor. The expression is Ba(1-x%)Eux%(Mg1 / 3Nb2 / 3)O3, wherein x is larger than or equal to 0.5 and smaller than or equal to 5. A preparation method comprises the steps: a peroxy-Nb-citric acid solution is prepared; a BMN:Eu precursor solution is prepared through an aqueous solution gel method; and after the BMN:Eu precursor solution is dried and calcined, the BMN:Eu phosphor is prepared. The obtained phosphor is even in particle size distribution and good in chemical stability, can emit red light with the high intensity and the good color purity under stimulation of near ultraviolet, and can be used for solving the problems that a WLED lacks in theefficient red phosphor, consequently the color rendering index is low, and the color temperature is high and is bias towards cold white.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a europium-doped barium magnesium niobate red fluorescent powder and a preparation method thereof. Background technique [0002] Semiconductor white light-emitting diode, referred to as WLED, is a lighting method with relatively long service life, high conversion efficiency and green environmental protection. It is widely used in transportation, lighting, display and other fields. A new light source of value. Under the same lighting conditions, the energy consumed by WLEDs is equivalent to 50% of fluorescent lamps, 20% of incandescent lamps, and the electricity consumed by traditional global lighting is 13% of the total consumption. If WLEDs are used to replace traditional lighting sources, it will The energy consumption is reduced by nearly half, and the energy-saving effect is very significant. The red, blue, and green phosphors are excited by the ultraviolet ...

Claims

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Application Information

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IPC IPC(8): C09K11/67
Inventor 沈杰王子行周静潘业博陈文
Owner WUHAN UNIV OF TECH
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