Red and orange light fluorescent powder with garnet structure and preparation method thereof

A phosphor, red-orange light technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of harsh preparation conditions, unstable luminescence color, and high cost

Active Publication Date: 2014-12-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can make up for the YAG:Ce to a certain extent 3+ The deficiency of fluorescent pink light also brings new problems: firstly, sulfide and nitride have their own shortcomings, such as the chemical stability of the former is

Method used

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  • Red and orange light fluorescent powder with garnet structure and preparation method thereof
  • Red and orange light fluorescent powder with garnet structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] The technical solution of the present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to this: Embodiment 1:

[0048] Mg 1.8 Ba 0.2 Y 1.77 La 0.2 Al 2.7 Ga 0.3 Si 0.9 Ge 0.1 O 11 Cl:0.03Ce 3+ Preparation of phosphor.

[0049] The preparation method is as follows:

[0050] Weigh 0.3627 grams of magnesium oxide (MgO), 0.1973 grams of barium carbonate (BaCO 3 ), 0.9992 grams of yttrium oxide (Y 2 O 3 ), 0.1629 grams of lanthanum oxide (La 2 O 3 ), 0.6063 grams of alumina (Al 2 O 3 ), 0.1406 grams of gallium oxide (Ga 2 O 3 ), 0.2703 grams of silicon dioxide (SiO 2 ), 0.0523 grams of germanium dioxide (GeO 2 ), 0.2222 grams of aluminum chloride (AlCl 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%. Put the above-mentioned raw material mixture in an agate mortar and grind it evenly, then put it into a corundum crucible, use a nitrogen m...

Example Embodiment

[0052] Example 2:

[0053] Mg 1.8 Ba 0.2 Y 1.77 La 0.2 Al 3.6 Ga 0.4 O 10 Cl 2 :0.03Ce 3+ Preparation of phosphor.

[0054] The preparation method is as follows:

[0055] Weigh 0.3627 grams of magnesium oxide (MgO), 0.1973 grams of barium carbonate (BaCO 3 ), 0.9992 grams of yttrium oxide (Y 2 O 3 ), 0.1629 grams of lanthanum oxide (La 2 O 3 ), 0.7567 grams of alumina (Al 2 O 3 ), 0.1874 grams of gallium oxide (Ga 2 O 3 ), 0.4445 grams of aluminum chloride (AlCl 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%. After the above raw material mixture is uniformly ground in an agate mortar, it is put into a corundum crucible, a nitrogen mixture containing 5v% carbon monoxide is used as a reducing atmosphere, a heating rate is 5°C / min, and the mixture is roasted at 1300°C for 10 hours and cooled to room temperature. Take the sintered product and grind it and then raise the temperature, and roast it once under the above-mentioned calcination c...

Example Embodiment

[0056] Example 3:

[0057] Mg 1.8 Ba 0.2 Y 1.77 La 0.2 Al 2.7 Ga 0.3 Si 0.9 Ge 0.1 O 11 F:0.03Ce 3+ Preparation of phosphor.

[0058] The preparation method is as follows:

[0059] Weigh 0.3627 grams of magnesium oxide (MgO), 0.1973 grams of barium carbonate (BaCO 3 ), 0.9992 grams of yttrium oxide (Y 2 O 3 ), 0.1629 grams of lanthanum oxide (La 2 O 3 ), 0.6063 grams of alumina (Al 2 O 3 ), 0.1406 grams of gallium oxide (Ga 2 O 3 ), 0.2703 grams of silicon dioxide (SiO 2 ), 0.0523 grams of germanium dioxide (GeO 2 ), 0.1340 grams of aluminum fluoride (AlF 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%. After the above raw material mixture is uniformly ground in an agate mortar, it is put into a corundum crucible, a nitrogen mixture containing 5v% hydrogen is used as a reducing atmosphere, a heating rate is 20°C / min, and it is calcined at 1340°C for 10 hours and cooled to room temperature. After crushing, the obtained sintered product i...

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Abstract

The invention discloses a red and orange light fluorescent powder with garnet structure. The fluorescent powder has a chemical expression of Mg2-xAxY2-y-cByAl2+z-aCaSi2-z-bDbO12-zEz:cCe<3+>, wherein A represents one or more than two selected from Ba, Sr and Ca in arbitrary proportion, B represents one or more than two selected from Gd, La and Sc in arbitrary proportion, C represents Ga, D represents Ge, E represents F or Cl, x, y,z, a, b and c represent corresponding mole fractions and satisfy the relations of: 0<=x<0.35, 0<=y<0.35, 0<z<=2, 0<=a<0.5, 0<=b<0.35, 0<c<0.2, and 2-z-b>=0. Under the excitation of blue light in wavelength of 455nm, the red and orange light fluorescent powder has emission wavelength range of 500-750 nm, wherein the main emission wavelength range is 600-621 nm, the emission spectra shows obvious redshift compared with YAG (delta S=60-80nm), and the preparation temperature is low.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorescent powder applied to semiconductor lighting, in particular to an emission spectrum and YAG:Ce 3+ A red-orange fluorescent powder for white LEDs with a red shift and low preparation temperature and a preparation method thereof. Background technique [0002] At present, the implementation of WLED mainly uses blue LED to excite the phosphor to emit yellow light, and the remaining blue light is transmitted and mixed with the yellow light emitted by the phosphor to generate white light. Due to its simplicity, low cost, and high efficiency of the obtained LED devices, it has attracted much attention. Among the yellow phosphors used, Ce 3+ Ion-activated yttrium aluminum garnet (YAG:Ce 3+ ) has become the most important commercially available yellow phosphor due to its high efficiency in absorbing blue light and converting it into yellow light. Co...

Claims

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Application Information

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IPC IPC(8): H01L33/50C09K11/86
Inventor 潘再法胡青松徐雨吴海勤李伟强王丽丽
Owner ZHEJIANG UNIV OF TECH
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