Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same

A red phosphor, double perovskite technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous intensity, insufficient red color purity, poor physical and chemical stability of host materials, etc., and achieve high luminous intensity. , The effect of good color purity and color rendering, short test period

Active Publication Date: 2015-08-12
河南和光光电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a double perovskite red phosphor co-doped with Li and Mg in view of the problems of low luminous intensity, insufficient red light color purity, and poor physical and chemical stability of the matrix material in the existing red phosphor. Another object of the present invention is to provide the preparation method of the above-mentioned double perovskite red phosphor

Method used

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  • Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same
  • Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same
  • Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same

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Experimental program
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Effect test

Embodiment 1

[0029] Composition is shown as 1# in table 1, and concrete preparation method comprises the following steps:

[0030] (1) the raw material Li 2 CO 3 , MgCO 3 、Na 2 CO 3 、WO 3 、Gd 2 o 3 、Eu 2 o 3 Weigh according to the stoichiometric ratio and raw material formula listed in Table 1, place in the alumina ball mill tank, add absolute ethanol and as the ball milling medium at the same time, and the alumina ball is used as the grinding ball;

[0031] (2) Put the ball mill jar on the ball mill, set the milling speed to 200r / min, and mill for 9 hours. The ball-milled slurry was taken out, put into a drying oven at 50°C, and dried for 12 hours.

[0032] (3) Calcining the dried and sieved mixture at high temperature, keeping it warm at 1300° C. for 4 hours, and cooling to room temperature with the furnace, to obtain the double perovskite red phosphor.

[0033] (4) Grinding the obtained product through a 200-mesh sieve, and then dry-pressing it into a thin disc with a powder ...

Embodiment 2

[0037]Composition is shown as 2# in table 1, and concrete preparation method comprises the following steps:

[0038] (1) the raw material Li 2 CO 3 , MgCO 3 、Na 2 CO 3 、WO 3 、Gd 2 o 3 、Eu 2 o 3 Weigh according to the stoichiometric ratio listed in Table 1 and the raw material formula, place in the alumina ball mill tank, add absolute ethanol and as the ball milling medium at the same time, and the alumina ball is used as the grinding ball;

[0039] (2) Put the ball mill jar on the ball mill, set the milling speed to 180r / min, and mill for 15 hours. The ball-milled slurry was taken out, put into a drying oven at 70°C, and dried for 10 hours.

[0040] (3) Calcining the dried and sieved mixture at high temperature, keeping it warm at 1200° C. for 5 hours, and cooling to room temperature with the furnace, to obtain the double perovskite red phosphor.

[0041] (4) Grinding the obtained product through a 200-mesh sieve, and then dry-pressing it into a thin disc with a pow...

Embodiment 3

[0045] Composition is shown as 2# in table 1, and concrete preparation method comprises the following steps:

[0046] (1) the raw material Li 2 CO 3 , MgCO 3 、Na 2 CO 3 、WO 3 、Gd 2 o 3 、Eu 2 o 3 Weigh according to the stoichiometric ratio listed in Table 1 and the raw material formula, place in the alumina ball mill tank, add absolute ethanol and as the ball milling medium at the same time, and the alumina ball is used as the grinding ball;

[0047] (2) Put the ball mill jar on the ball mill, set the milling speed to 140r / min, and mill for 18 hours. The ball-milled slurry was taken out, put into a drying oven at 100°C, and dried for 10 hours.

[0048] (3) Calcining the dried and sieved mixture at a high temperature, keeping the temperature at 1100° C. for 6 hours, and cooling down to room temperature with the furnace to obtain the double perovskite red phosphor.

[0049] (4) Grinding the obtained product through a 200-mesh sieve, and then dry-pressing it into a thin...

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Abstract

The invention relates to a Li/Mg-codoped bi-perovskite red fluorescent powder and preparation method of same, wherein the red fluorescent powder is characterized by being represented as the following formula: Na(Gd<1-x-y-z>Eu<x>Li<y>Mg<z>)MgWO6, wherein 0.05 <= x <= 0.2, 0.02 <= y <= 0.1 and 0.02 <= z <= 0.2. The red fluorescent powder is prepared through a solid-phase method. In the invention, bi-perovskite NaGdMgWO6 is employed as a basic structure material, europium is employed as a red luminescent center and the codoped lithium and magnesium are employed as sensitization sources and are used for providing a fluxing effect, wherein the three mentioned above substitute the position of gadolinium in the bi-perovskite NaGdMgWO6 to generate low crystal lattice symmetry, thereby ensuring stability, high efficiency and high color rendering property of the fluorescent powder. In addition, the fluorescent powder is prepared through a conventional solid-phase method which is simple in operation and is controllable in process.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a co-doped double perovskite red fluorescent powder and a preparation method thereof. Background technique [0002] White light LED is the fourth-generation lighting source after incandescent lamps, fluorescent lamps and energy-saving lamps. It is called the green light source of the 21st century. features. LED is expected to replace traditional lighting sources in the future. And it will be widely used in flat panel display, road lighting and other fields. [0003] At present, white light LED emits white light mainly by phosphor conversion method. The commercialized way to obtain white light is to excite Y with 460nm blue GaN chip 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 ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/77
Inventor 张乐叶勇王骋唐定远沈德元
Owner 河南和光光电有限公司
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