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Garnet-type phosphor, preparation method, and device containing the phosphor

A phosphor and garnet technology, applied in the field of inorganic LED luminescent materials, achieves the effects of simple preparation process, wide effective excitation range and low synthesis temperature

Active Publication Date: 2018-07-20
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For garnet structure compounds doped with rare earth elements as phosphors, their B-site elements are classified, usually with divalent metal elements (such as non-patent literature 1, Lu 2 CaMg 2 (Si,Ge) 3 o 12 Mg in), trivalent metal elements (such as Patent Document 1, Al in YAG; Patent Document 2, Ca 3 sc 2 Si 3 o 12 Sc in), pentavalent metal elements (such as patent document 3, Li 5 La 2 Ta 2 o 12 Ta in Ta); while the B-site element is the compound Ca of the tetravalent metal element Zr 2 Zr 2 Ga 3 o 12 (such as non-patent literature 2), there is no report of its solid solution rare earth elements as phosphor

Method used

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  • Garnet-type phosphor, preparation method, and device containing the phosphor
  • Garnet-type phosphor, preparation method, and device containing the phosphor
  • Garnet-type phosphor, preparation method, and device containing the phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] According to the chemical formula of phosphor (Ca 2 La 0.96 , Ce 0.04 )Zr 2 Ga 3 o 12 Weigh 0.2mol CaCO 3 , 0.048molLa 2 o 3 , 0.2mol ZrO 2 , 0.15mol Ga 2 o 3 , 0.004mol CeO 2 . After fully mixing and grinding, bake at 1350°C for 4 hours in a CO atmosphere. After crushing, grading, washing, drying and sieving of the roasted product, the composition can be obtained as (Ca 2 La 0.96 , Ce 0.04 )Zr 2 Ga 3 o 12 of fluorescent powder. Its X-powder diffraction pattern (Co target, λ=0.178892nm) such as figure 1 shown. Its excitation spectrum (monitored at 515nm) and emission spectrum (excited at 420nm) are as figure 2 with image 3 As shown, it can be seen from the figure that the excitation wavelength range covers 280-480nm, and the emission spectrum peak wavelength is 515nm under excitation at 420nm, and the relative luminous intensity is shown in Table 3.

Embodiment 2

[0063]According to the chemical formula of phosphor (Ca 2.91 , Ce 0.06 )Zr 2 (Ga 2 Ge)O 12 Weigh 0.291mol CaCO 3 , 0.2molZrO 2 , 0.1mol GeO 2 , 0.1mol Ga 2 o 3 , 0.006mol CeO 2 . After fully mixing and grinding, bake at 1320°C for 8 hours in a CO atmosphere. After crushing, grading, washing, drying and sieving of the roasted product, the composition can be obtained as (Ca 2.91 , Ce 0.06 )Zr 2 (Ga 2 Ge)O 12 of fluorescent powder. Its X-powder diffraction pattern (Co target, λ=0.178892nm) such as Figure 4 shown. Its excitation spectrum (monitored at 475nm) and emission spectrum (excited at 420nm) are as Figure 5 with Image 6 As shown, it can be seen from the figure that the excitation spectrum wavelength range covers 280-440nm, and the emission spectrum peak wavelength is 475nm under excitation at 420nm, and the relative luminous intensity is shown in Table 3.

Embodiment 3

[0065] According to the chemical formula of phosphor (Ca 2 Y 0.94 , Ce 0.06 )Zr 2 Ga 3 o 12 Weigh 0.2mol CaCO 3 , 0.2mol ZrO 2 , 0.047mol Y 2 o 3 , 0.15mol Ga 2 o 3 , 0.006mol Ce(NO 3 ) 3 . After fully mixing and grinding, in H 2 / N 2 In a mixed atmosphere, bake at 1360°C for 6 hours. After crushing, grading, washing, drying and sieving of the roasted product, the composition can be obtained as (Ca 2 Y 0.94 , Ce 0.06 )Zr 2 Ga 3 o 12 of fluorescent powder. The fitting parameters of its X-powder ray diffraction refinement are shown in Table 1 and Table 2, and the fitting of the spectrum is shown in Figure 7 The wavelength range of its excitation spectrum covers 280-480nm, under the excitation of 420nm, the peak wavelength of emission spectrum is 512nm, and the relative luminous intensity is shown in Table 3.

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Abstract

The invention relates to a fluorescent powder with a garnet structure that can be effectively excited by ultraviolet or blue light. The chemical formula of the fluorescent powder is expressed as: (M1a-xM2x)ZrbM3cOd, wherein the M1 element is selected from Sr, Ca, La, Y, One or both of Lu and Gd, which must contain Ca or Sr, M2 elements are selected from one or two of Ce, Pr, Sm, Eu, Tb and Dy, must contain Ce, M3 elements are optional At least one of Ga, Si and Ge must contain Ga; 2.8≤a≤3.2, 1.9≤b≤2.1, 2.8≤c≤3.2, 11.8≤d≤12.2, 0.002≤x≤0.6. In addition, it also relates to a method for preparing the phosphor and a light-emitting device, an image display device and a lighting device containing the phosphor.

Description

technical field [0001] The invention belongs to the field of inorganic LED luminescent materials, and in particular relates to a fluorescent powder, more specifically to a fluorescent powder with a garnet structure, which can be effectively excited by ultraviolet or blue light to emit visible light. The present invention also relates to a method for preparing the phosphor and a light emitting device, an image display device and a lighting device comprising the phosphor. Background technique [0002] Light-emitting diodes (LEDs) have the advantages of high luminous efficiency, low power consumption, long life, low pollution, small size, and fast operation response, and are currently widely used in lighting, display and other fields. Among them, YAG:Ce 3+ (Y 3 al 5 o 12 : Ce 3+ ) Yellow powder is matched with blue LED chips to realize white light, which has the characteristics of high efficiency, low cost, and simple production, and is widely used. The very important rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/7718C09K11/7769H01L33/502C09K11/77742C09K11/77922C09K11/77212F21K9/20C09K11/08F21Y2115/10H01L33/505C30B1/10C30B29/22
Inventor 庄卫东钟继有刘荣辉李彦峰刘元红徐会兵陈磊
Owner GRIREM ADVANCED MATERIALS CO LTD
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