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Red fluorescent luminescent material and preparation method thereof

A luminescent material and red fluorescence technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of different decay times of long afterglow phosphors, lack of long afterglow fluorescent luminescent materials, etc., and achieve stable product chemical properties and low production costs. , the effect of simple preparation process

Active Publication Date: 2014-11-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the different decay times of long-lasting phosphors of various colors, it is impossible to achieve this goal through the three primary colors of red, green and blue for long-lasting luminescence. Therefore, it is necessary to develop long-lasting materials of various colors
At present, blue and green long-lasting phosphors have become mature and have been used in actual production, but red long-lasting phosphors are still scarce

Method used

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  • Red fluorescent luminescent material and preparation method thereof
  • Red fluorescent luminescent material and preparation method thereof
  • Red fluorescent luminescent material and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a preparation method of the red fluorescent luminescent material described in the above technical solution, comprising the following steps:

[0040] mixing a Ba-containing compound, an Eu-containing compound, an Al-containing compound and silicon dioxide to obtain a mixture;

[0041] The molar ratio of Ba element, M element, Eu element, R element, Al element, Ga element and silicon element in the mixture is (3.8-5.9999): (0-1): (0.0001-0.6): (0-0.6 ): (17~18): (0~1): 2;

[0042] The mixture is sintered in a reducing atmosphere to obtain a red fluorescent material.

[0043] Above in the present invention, at first various raw materials are mixed, obtain mixture, wherein:

[0044] The Ba-containing compound is preferably barium oxide, nitrate or hydroxide; the Al-containing compound is aluminum-containing oxide, nitrate or hydroxide.

[0045] The R-containing compound, the R-containing compound is an R-containing oxide or oxalate. The...

Embodiment 1

[0057] To analyze pure BaCO 3 , Analytical pure Al 2 o 3 , Analytical pure SiO 2 As raw material, with analytically pure B 2 o 3 As flux, BaCO 3 、Al 2 o 3 , SiO 2 and B 2 o 3 The molar ratio between them is 6:9:2:0.5. Accurately weigh the above substances, fully grind them evenly in an agate mortar, put them into a corundum crucible, then put them into a large corundum crucible, fill them with carbon rods, put them into Roast in a high-temperature furnace at 1350°C for 5 hours, cool naturally to room temperature, take out and grind to obtain a white powder sample, the actual composition of which is Ba 6 Al 18 Si 2 o 37 .

[0058] Carry out X-ray diffraction analysis to the sample that embodiment 1 obtains, instrument used is German Bruker / D8-FOCUS X-Ray Diffractometer, and radiation source is Cu Kα1 (λ=1.5405nm), scanning range: 2θ=10 °-80 ° , scan speed 10° / min. figure 1 For the XRD diffraction pattern of the red fluorescent luminescent material prepared in em...

Embodiment 2

[0060] BaCO 3 (analytical pure), Al 2 o 3 (analytical pure), SiO 2 (analytical pure), Eu 2 o 3 (99.99%), with B 2 o 3 (Analytical pure) is the flux, and the molar ratio between them is 5.9998:9:2:0.0001:0.5. The above raw materials are accurately weighed, fully ground in an agate mortar, put into a corundum crucible, and then put into a large Fill a corundum crucible with carbon rods, put it into a high-temperature furnace and bake at 1350°C for 5 hours, cool it down to room temperature naturally, take it out and grind it, and then you can get a light yellow powder sample, the actual composition is Ba 5.9998 Eu 0.0002 Al 18 Si 2 o 37 . Its excitation peak is as figure 2 As shown, its emission spectrum is broadband emission, and the maximum emission wavelength is located near 600nm. The sample is exposed to sunlight for 10 minutes, and the sample emits a long red afterglow. After the test of the ST-86LA screen luminance meter, the afterglow time can last for about...

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Abstract

The invention provides a red fluorescent luminescent material. The red fluorescent luminescent material comprises the atomic ratio as shown in formula (I): Ba6-a-x-yMaEuxRyAl18-bGabSi2O37 (I). A preparation method comprises the following steps of: mixing a Ba-containing compound, an M-containing compound, an Eu-containing compound, an R-containing compound, an Al-containing compound, a Ga-containing oxide and silicon dioxide to obtain a mixture; and sintering the mixture in a reducing atmosphere to obtain the red fluorescent luminescent material. The red fluorescent luminescent material provided by the invention can be effectively excited by a gallium nitride light source to produce red light emission and can be effectively excited by sunlight, in particular to a blue light component in the sunlight, and further has the advantages of bright afterglow and long time. Testing finds that the duration of red afterglow is at least 20min (>0.32mcd / m<2>). Simultaneously, the material is fluffy and very easy to grind, and further has the advantages of simple preparation process, low production cost, stable chemical properties of products, no radioactivity and no harm to the environment.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a red fluorescent luminescent material and a preparation method thereof. Background technique [0002] White LEDs have attracted widespread attention because of their low energy consumption, long life, small size, light weight, compact structure, no pollution, and good stability. At present, white light can excite yellow phosphor YAG:Ce by using LED blue light as the excitation source. 3+ The resulting blue-yellow mixed light is achieved. In this device, the blue light emitted by the LED blue light is absorbed by the phosphor and converted into long-wavelength yellow light emission, and the unabsorbed blue light is recombined with the yellow light emitted by the phosphor to obtain white light. The white light synthesized by this method is a kind of cool white light because of the lack of red light components in the spectrum, low color rendering index and high color temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64C09K11/80
Inventor 李成宇赵然庞然苏锵
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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