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A kind of green fluorescent powder excited by purple light LED and preparation method thereof

A green phosphor and violet light technology, applied in the field of green phosphor, can solve the problems of poor matching and low luminous intensity, and achieve the effect of good matching and high commercial application value

Active Publication Date: 2016-08-24
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The currently used RGB phosphors are mainly Y 2 o 3 S: Eu 2+ , BaMgAl 10 o 17 : Eu 2+ , ZnS:Cu + , Al 3+ etc., but the green powder system used mainly includes orthosilicate, phosphate, nitride, sulfide, aluminate and halosilicate, and the prepared green phosphor has poor matching with the purple chip. Disadvantages of low luminous intensity

Method used

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  • A kind of green fluorescent powder excited by purple light LED and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Weigh 0.95mol CaCO according to the general chemical formula 3 , 1.9 mol MgCO 3 , 8mol SiO 2 , 16mol Al 2 o 3 , 0.025mol Eu 2 o 3 , 0.1mol MnO 2 As a raw material, weigh 0.1% flux AlF of the total mass of the raw material 3 Mix with the raw materials, mix evenly, ball mill for 8 hours, the ball milling speed is 120 rpm, and then calcined in the reducing atmosphere created by activated carbon powder, the temperature is 1150 ° C, the calcining time is 6 hours, and the holding time is 2 hours. Fluorescent classification technology can accurately classify the phosphor powder, that is, get the required Ca 0.95 Mg 1.9 Si 8 al 16 o 43 : 0.05Eu 2+ , 0.1Mn 2+ Phosphor.

Embodiment 2

[0021] Weigh 0.85mol BaCO according to the general chemical formula 3 , 1.85mol MgCO 3 , 8mol SiO 2 , 16mol Al 2 o 3 , 0.075mol Eu 2 o 3 , 0.15mol MnO 2 As a raw material, weigh 0.4% flux NH of the total mass of the raw material 4 Cl is mixed with the raw materials, mixed evenly, ball milled for 9 hours, the ball milling speed is 130 rpm, and then calcined under the reducing atmosphere created by activated carbon powder, the temperature is 1250 ° C, the calcining time is 8 hours, and the holding time is 4 hours. Take out, cool and pulverize, use The swirl classification technology can accurately classify the phosphor powder to obtain the required Ba 0.85 Mg 1.85 Si 8 al 16 o 43 : 0.15Eu 2+ , 0.15Mn 2+ Phosphor.

Embodiment 3

[0023] Weigh 0.80mol SrCO according to the general chemical formula 3 , 1.80mol MgCO 3 , 8mol SiO 2 , 16mol Al 2 o 3 , 0.10mol Eu 2 o 3 , 0.20mol MnO 2 As a raw material, weigh 0.5% flux Li of the total mass of the raw material 2 CO 3 Mix with the raw materials, mix evenly, ball mill for 10 hours, the ball milling speed is 125 rpm, and then calcined under the reducing atmosphere created by activated carbon powder, the temperature is 1300°C, the calcining time is 10h, and the holding time is 2h. Fluorescent classification technology to accurately classify the phosphor powder, that is, to obtain the required Sr 0.80 Mg 1.80 Si 8 al 16 o 43 : 0.20Eu 2+ , 0.20Mn 2+ Phosphor.

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Abstract

The invention discloses a violet-light emitting diode (LED) excited green phosphor and a preparation method thereof. The green phosphor has the chemical formula of M(1-x)Mg(2-y)Si8Al16O43:xEu<2+>, yMn<2+>, wherein M can be Ca or Sr or Ba, x is more than 0 and less than 1, and y is more than 0 and less than 2. MMg2Si8Al16O43 serves as the matrix of the green phosphor, and Eu<2+> and Mn<2+> are doped into the MMg2Si8Al16O43. The green phosphor is prepared by mainly adopting a high-temperature solid-phase method according to the following specific steps of: weighing needed raw materials and fluxing agents according to chemical proportions, mixing uniformly, carrying out ball-milling, calcining in the reducing atmosphere, cooling and crushing, and accurately classifying phosphor powder by using the cyclone classification technology to obtain the required phosphor. The green phosphor disclosed by the invention has strong capacity of absorbing light of 275-425nm, the emission peak is in the visible light range of 450-600nm and has the advantages of wide spectrums of excitation and emission, high light emitting intensity and uniform particle size distribution.

Description

technical field [0001] The invention relates to a green fluorescent powder excited by a violet LED, and provides a preparation method of the fluorescent material, belonging to the field of luminescent materials. Background technique [0002] White LED lighting is recognized as the fourth-generation lighting product because of its advantages such as high luminous efficiency, long life, energy saving and environmental protection, safety and reliability, and has shown great application potential and development in the fields of indoor and outdoor lighting, backlight, and special lighting. prospect. At present, the main way to realize white LED lighting is to excite YAG yellow phosphor powder with blue LED chips. This method has the advantages of simple operation and low cost, but its disadvantages are the low color rendering index and low light quality of the prepared white LED. People's requirements for high-quality light, this method obviously cannot satisfy everyone. In re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 卓宁泽王海波朱月华邢海东施丰华李登宇李博超
Owner NANJING TECH UNIV
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