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

A phosphor and garnet technology, applied in the field of yellow-orange phosphor for white LED and its preparation, can solve the problems of poor chemical stability, harmful environment, harsh preparation conditions, etc.

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 not good, and it is harmful to the environment, while the preparation conditions of the latter are very harsh and the cost is high. Second, due to the reabsorption of emission energy between different phosphors, the emission color is unstable

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mg 2.7 Ba 0.3 Y 1.77 La 0.2 Al 0.9 Ga 0.1 Si 1.8 Ge 0.2 o 11 Cl:0.03Ce 3+ Phosphor powder preparation.

[0048] The preparation method is as follows:

[0049] Weigh respectively 0.5441 gram of magnesium oxide (MgO), 0.2960 gram 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 ), 0.2258 grams of alumina (Al 2 o 3), 0.0469 grams of gallium oxide (Ga 2 o 3 ), 0.5408 grams of silicon dioxide (SiO 2 ), 0.1046 grams of germanium dioxide (GeO 2 ), 0.2222 grams of aluminum chloride (AlCl 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the above raw material purity is more than 99%. Grind the above raw material mixture in an agate mortar evenly, put it into a corundum crucible, use nitrogen mixture containing 5v% hydrogen as reducing atmosphere, heat up at a rate of 10°C / min, roast at 1350°C for 8h, and cool to room temperature . After crushing, the obtained sintered product is ground with a ba...

Embodiment 2

[0052] Mg 2.7 Ba 0.3 Y 1.77 La 0.2 Al 1.8 Ga 0.2 Si 0.9 Ge 0.1 o 10 Cl 2 :0.03Ce 3+ Phosphor powder preparation.

[0053] The preparation method is as follows:

[0054] Weigh respectively 0.5441 gram of magnesium oxide (MgO), 0.2960 gram 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 ), 0.4515 grams of alumina (Al 2 o 3 ), 0.0937 grams of gallium oxide (Ga 2 o 3 ), 0.2704 grams of silicon dioxide (SiO 2 ), 0.0523 grams of germanium dioxide (GeO 2 ), 0.4445 grams of aluminum chloride (AlCl 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the above raw material purity is more than 99%. Grind the above raw material mixture evenly in an agate mortar, put it into a corundum crucible, use a nitrogen mixture containing 5v% carbon monoxide as a reducing atmosphere, heat up at a rate of 5°C / min, bake at 1280°C for 10h, and cool to room temperature. Take the sintered product, grind it and then raise t...

Embodiment 3

[0056] Mg 2.7 Ba 0.3 Y 1.77 La 0.2 Al 0.9 Ga 0.1 Si 1.8 Ge 0.2 o 11 F:0.03Ce 3+ Phosphor powder preparation.

[0057] The preparation method is as follows:

[0058] Weigh respectively 0.5441 gram of magnesium oxide (MgO), 0.2960 gram 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 ), 0.2258 grams of alumina (Al 2 o 3 ), 0.0469 grams of gallium oxide (Ga 2 o 3 ), 0.5408 grams of silicon dioxide (SiO 2 ), 0.1046 grams of germanium dioxide (GeO 2 ), 0.1340 grams of aluminum fluoride (AlF 3 ), 0.0258 grams of cerium oxide (CeO 2 ), the above raw material purity is more than 99%. Grind the above-mentioned raw material mixture evenly in an agate mortar, put it into a corundum crucible, use a nitrogen mixture containing 5v% hydrogen as a reducing atmosphere, heat up at a rate of 20°C / min, bake at 1340°C for 10h, and cool to room temperature. After the obtained sintered product is crushed, it is ...

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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 Mg3-xAxY2-y-cByAlz-aCaSi3-z-bDbO12-zEz:cCe<3+>, wherein A represents a composition of one or more than two selected from Ba, Sr and Ca in arbitrary proportion, B represents a composition 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 z-a>0. Under the excitation of blue light in wavelength of 455nm, the yellow 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 spectrum shows obvious redshift compared with YAG (delta S=45-85 nm), 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+ Yellow-orange fluorescent powder for white LEDs with red shift and low preparation temperature and 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. Compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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