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

A technology of blue phosphor and violet light, applied in the field of blue phosphor, can solve the problems of no excitation and emission intensity, low luminous intensity, low energy consumption, etc., and achieve high commercial application value, high luminous intensity, and good matching. sexual effect

Inactive Publication Date: 2016-06-01
JIAXING UNIV
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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 blue powder system used therein mainly includes phosphate, silicate, halosilicate, and the prepared blue phosphor has the disadvantages of poor matching with the purple chip and low luminous intensity
[0004] For example, in the patent document CN102533268A, a blue luminescent material and its preparation method are disclosed, the chemical composition is Ba 1-x Eu x Ca 2 MgSi 2 o 8 , the blue phosphor prepared by this method is stronger than the current commercial blue phosphor (BAM), but its stronger excitation peak is in the vacuum ultraviolet band less than 254nm, and the excitation and emission intensity in the near ultraviolet band have not been proposed. Therefore, the compatibility with the Ziguang chip is also unknown
[0005] As in the patent document CN101519590B, it involves a kind of Y 2 o 2 S is the blue fluorescent powder of matrix and preparation method thereof, chemical composition is Y x Cu y o 2 S has strong absorption in the range of 250-360nm, but due to the instability of the sulfide matrix, it is easy to decompose and release hydrogen sulfide gas and other defects when heated, so the application prospect of this type of phosphor is unclear.
[0006] For example, in the patent document CN103849386A, a method for preparing aluminate blue fluorescent powder by sol self-combustion method is disclosed. Low, a large amount of gas is released during the preparation process, which is not conducive to environmental protection

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

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preparation example Construction

[0022] According to another aspect of the present invention, the present invention provides a method for preparing the blue phosphor excited by the above-mentioned violet LED. The method includes the following steps:

[0023] Step 1: According to the chemical structure of blue phosphor M 1-x MgSi 5 Al 10 O 27 :xEu 2+ The stoichiometric number shown, weigh the raw material MCO 3 , MgCO 3 , SiO 2 , Al 2 O 3 And Eu 2 O 3 , Mix these raw materials with flux uniformly, and put them in a mortar to grind them thoroughly;

[0024] The second step: calcining the above-mentioned ground material in a reducing atmosphere, the calcining temperature is 1100-1300°C, the calcining time is 5-10h, after calcining, it is cooled and crushed to obtain the blue phosphor of the present invention.

[0025] In the first step, the flux is selected from AlF 3 , NH 4 F, Li 2 CO 3 , H 3 BO 3 , NaCO 3 One or more of them, and preferably AlF 3 The amount of flux is 0.1wt% to 1.0wt% of the total mass of the raw mate...

Embodiment 1

[0030] Weigh 0.99molCaCO according to the chemical structure of the blue phosphor 3 , 1.0molMgCO 3 , 5.0molSiO 2 , 5.0molAl 2 O 3 , 0.005molEu 2 O 3 As a raw material, weigh 0.4wt% of the total mass of the raw material AlF flux 3 To mix with the raw materials, put the weighed raw materials and flux into a mortar to grind, grind for 10 minutes, and sieve the ground material through a 300-mesh screen to obtain the sieved material;

[0031] Place the above-mentioned sieved materials in a crucible, weigh 10wt% of the total mass of the above-mentioned raw materials, and place the activated carbon powder around the crucible where the raw materials are located, and calcinate in a reducing atmosphere created by these activated carbon powders at a calcination temperature of 1100°C. Time 10h; after calcination, take out the calcined material, after cooling and crushing, the required Ca is obtained 0.99 MgSi 5 Al 10 O 27 :0.01Eu 2+ Phosphor.

[0032] figure 1 Shows blue phosphor Ca 0.99 MgSi ...

Embodiment 2

[0034] Weigh 0.97molSrCO according to the chemical structure of the blue phosphor 3 , 1.0molMgCO 3 , 5.0molSiO 2 , 5.0molAl 2 O 3 , 0.015molEu 2 O 3 As a raw material, weigh 0.5wt% of the flux H of the total mass of the raw material 3 BO 3 To mix with the raw materials, put the weighed raw materials and flux into a mortar to grind, grind for 10 minutes, and sieve the ground material through a 300-mesh screen to obtain the sieved material;

[0035] Place the above-mentioned sieved materials in a crucible, weigh 12wt% of the total mass of the above-mentioned raw materials, and place the activated carbon powder around the crucible where the raw materials are located, and calcinate in a reducing atmosphere created by these activated carbon powders at a calcination temperature of 1150°C. Time 9h; after calcination, take out the calcined material, after cooling and crushing, the required Sr can be obtained 0.97 MgSi 5 Al 10 O 27 :0.03Eu 2+ Phosphor.

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Abstract

The invention belongs to the field of luminescent materials and relates to violet-LED excited blue fluorescent powder and a preparation method thereof. The chemical structural formula of the violet-LED excited blue fluorescent powder is M1-xMgSi5Al10O27: xEu<2+>, wherein M is one of Ca, Sr and Ba, x represents a molar coefficient, and x is greater than 0 and less than 1. The blue fluorescent powder has an extremely wide excitation peak, has strong absorption within the range of 250nm to 375nm, and can be well matched with a violet chip; the emission spectrum of the blue fluorescent powder is located within the range of 400nm to 540nm, and therefore, the blue fluorescent powder is high in luminous intensity and has a relatively high commercial application value; the preparation method of the blue fluorescent powder has the advantages of easily available raw material, simple process and low cost.

Description

Technical field [0001] The invention relates to a blue 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] At present, the main form of realizing white light LED lighting is that blue LED chips excite YAG yellow phosphor. This method has the advantages of simple process and low cost, but the white light LED prepared by it has low color rendering index and low light quality. As people demand high-quality lighting, this method obviously cannot be recognized by everyone. [0003] In recent years, the method of preparing white LEDs by using purple chips to excite RGB phosphors has received extensive attention and research. The white LEDs prepared by this method have the advantages of high color rendering index, good color reproduction, and stable and reliable products. The RGB phosphor currently used is mainly Y 2 O 3 S: Eu 2+ , BaMgAl 10 O 17 :Eu 2+ , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 沈静飞屠晓华宗乾收缪程平蔡丽玲吴建一
Owner JIAXING UNIV
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