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Blue light-ultraviolet continuously-adjustable aluminate fluorescent powder and preparation method thereof

A fluorescent powder and aluminate technology, applied in the field of rare earth luminescent materials, can solve the problems of inability to enhance the stability of fluorescent powder, singleness, etc.

Inactive Publication Date: 2013-12-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is relatively simple, although it can adjust the emission wavelength of the phosphor, it cannot enhance the stability of the phosphor

Method used

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  • Blue light-ultraviolet continuously-adjustable aluminate fluorescent powder and preparation method thereof
  • Blue light-ultraviolet continuously-adjustable aluminate fluorescent powder and preparation method thereof
  • Blue light-ultraviolet continuously-adjustable aluminate fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The chemical formula of the blue-light ultraviolet continuously adjustable aluminate phosphor is: CeAl 11-x Si x o 18-x N x , in this embodiment, take x=0.1. Its preparation method includes the following steps: (1), fully grind and mix cerium oxide, aluminum oxide, silicon nitride and silicon oxide according to the atomic weight ratio of each element in the chemical formula of the above-mentioned phosphor; (2), and then mix the above-mentioned mixed powder , placed in a boron nitride boat and placed in a sintering furnace, vacuumed to 10 -3 Pa, nitrogen gas is introduced to make the nitrogen pressure reach an atmospheric pressure, and the flow rate is 0.3L / min; (3) the temperature is raised from room temperature to 1200°C at a rate of 3°C / min, and the temperature is kept at 8 hours; (4), the sintered product can be ground The blue-light ultraviolet continuously adjustable aluminate phosphor is obtained.

[0019] In this embodiment, the emission spectrum of the blue...

Embodiment 2

[0021] The chemical formula of the blue-light ultraviolet continuously adjustable aluminate phosphor is: CeAl 11-x Si x o 18-x N x , in this embodiment, take x=1.3. The preparation method includes the following steps: (1) thoroughly grinding and mixing cerium oxide, aluminum oxide, silicon nitride and silane according to the atomic weight ratio of each element in the chemical formula of the phosphor powder; (2) and then mixing the above mixed powder, Put it in a boron nitride boat and place it in a sintering furnace, and vacuumize it to 10 -3 Pa, a mixed gas of nitrogen and hydrogen is introduced, the volume fraction of hydrogen is 10%, the air pressure is brought to an atmospheric pressure, and the flow rate is 0.1L / min; (3), the temperature is raised from room temperature at 20°C / min to 1500°C, and the temperature is kept for 4 Hours; (4) After grinding the sintered product, the aluminate phosphor powder with continuously adjustable blue light and ultraviolet light can b...

Embodiment 3

[0024] The chemical formula of the blue-light ultraviolet continuously adjustable aluminate phosphor is: CeAl 11-x Si x o 18-x N x , in this embodiment, take x=4. The preparation method includes the following steps: (1) fully grinding and mixing cerium nitrate, aluminum nitrate, silicon nitride and silicon oxide according to the atomic weight ratio of each element in the chemical formula of the above-mentioned phosphor; (2) then putting the above-mentioned mixed powder into Put it into the boron nitride boat and place it in the sintering furnace, and vacuumize it to 10 -3 Pa, a mixed gas of nitrogen and hydrogen is introduced, the volume fraction of hydrogen is 20%, the pressure is brought to an atmospheric pressure, and the flow rate is 1L / min; (3) The temperature is raised from room temperature to 1800°C at a rate of 10°C / min, and the temperature is kept for 1 hour; (4) Just grind the sintered product.

[0025] In this embodiment, the emission spectrum of the blue-light...

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Abstract

The invention provides a blue light-ultraviolet continuously-adjustable aluminate fluorescent powder and a preparation method thereof. A Si-N bond is substituted for a Al-O bond; after the substitution, the internal structure of the fluorescent powder is improved; and thus, the luminescent spectrum of the fluorescent powder is continuously adjustable from blue light to ultraviolet light according to different substitution proportions. The fluorescent powder is more stable due to the doping of the Si-N key. The Si-N bond and Al-O bond have similar bond lengths, Si and Al, and O and N have similar bonding characteristics according to the diagonal line principle, so the Al-O bond in the aluminate-base fluorescent powder can be easily partially substituted by the Si-N bond; according to the charge compensation effect, after (SiN)+ is substituted for (AlO)+, the charge balance can be maintained; the bond length of the Si-N bond is slightly smaller than that of the Al-O bond, so that the matrix lattice constant is reduced, the cell volume is correspondingly reduced, and the atomic arrangement in the matrix is closer; and N with relatively smaller electronegativity can stabilize the Ce<2+>, so the material stability and light-emitting stability of the fluorescent powder are enhanced.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and more specifically relates to an aluminate fluorescent powder continuously adjustable in blue light and ultraviolet and a preparation method thereof. Background technique [0002] Electromagnetic waves with a wavelength of 100-380nm are ultraviolet light. The blue light band in visible light is located at 425-480nm. Ultraviolet emitting phosphors produce near-ultraviolet (wavelength 300-380nm) emission when excited by a low-pressure mercury vapor lamp (wavelength 253.7nm). With different emission wavelengths, it can be used in different occasions. For example, it can be used to make black light lamps, mosquito killer lamps, health care lamps, medical lamps, and ultraviolet components of fluorescent lamps that imitate sunlight. Ultraviolet phosphors with special wavelengths can also be used to make experimental Coin lamps and anti-counterfeiting light sources. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 王超尹良君陈国璋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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