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Phosphor powder and preparation method thereof and luminescent device

A technology for light-emitting devices and phosphors, which is applied in the fields of light-emitting materials, semiconductor devices, chemical instruments and methods, can solve the problems of reducing the excitation efficiency of phosphors and increasing production costs, and achieves ultra-high color rendering index, high quantum efficiency, Efficient lighting effect

Inactive Publication Date: 2018-10-23
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

White LED products on the market mainly use 440-460nm blue light chips to excite phosphors and provide blue light. Ultra-long wavelength blue light chips not only increase production costs, but also reduce the excitation efficiency of phosphors, so this solution is generally not adopted.

Method used

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  • Phosphor powder and preparation method thereof and luminescent device
  • Phosphor powder and preparation method thereof and luminescent device
  • Phosphor powder and preparation method thereof and luminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The present embodiment 1 proposes a kind of preparation method of fluorescent powder, comprises the following steps:

[0060] According to the chemical composition of the fluorescent powder proposed by the present invention, including Lu 2.98 (Al 2.99 Ga 2.01 )O 12 :0.02Ce, Lu 2.98 (Al 2.95 Ga 2.05 )O 12 :0.02Ce, Lu 2.98 (Al 2.8 Ga 2.2 )O 12 :0.02Ce, Lu 2.98 (Al 2.7 Ga 2.3 )O 12 :0.02Ce, Lu 2.98 (Al 2.55 Ga 2.45 )O 12 : 0.02Ce, etc., according to the stoichiometric ratio (ie mole percentage) of cations in the corresponding chemical composition, respectively weigh Lu 2 o 3 、Al 2 o 3 , Ga 2 o 3 and CeO 2 Raw materials, the raw materials are powder materials, and the purity of the raw materials is chemically pure, with Lu 2 o 3 (purity 99.99%), Al 2 o 3 (purity 99.99%), Ga 2 o 3 (purity 99.99%), CeO 2 (purity 99.99%) is preferred; further, the raw material in the present embodiment 1 also includes fluxing agent BaF 2 and / or BaCl 2 , the flu...

Embodiment 2

[0069] Another fluorescent powder proposed in Example 2 and its preparation method has Lu 3-x (Al 2.95 Ga 2.05 )O 12 : the composition of xCe, wherein preferably x satisfies: 0.015≤x≤0.025, and in this embodiment 2, x takes values: 0.015, 0.02, 0.025 respectively. Prepare Example 2 according to the same preparation method as Example 1 to obtain Lu 3-x (Al 2.95 Ga 2.05 )O 12 : Phosphor powder of xCe series.

[0070] Similarly, test the excitation spectrum of the fluorescent powder prepared in Example 2, such as Figure 7 Lu2.985(Al2.95Ga2.05)O12:0.015Ce, Lu2.98(Al2.95Ga2.05)O12:0.02Ce and Lu2.975(Al2.95Ga2.05)O12:0.025 of Example 2 of the present invention The excitation spectrum diagram of the Ce phosphor shows that under the action of excitation light with a wavelength of about 440nm, the phosphor powder prepared in Example 2 has the strongest fluorescence intensity; Figure 8 For the emission spectrum of the phosphor powder prepared in this embodiment, the emission ...

Embodiment 3

[0073] Another kind of fluorescent powder and its preparation method proposed in this embodiment 3 have Lu 3-x (Al 2.8 Ga 2.2 )O 12 : The composition of xCe, in present embodiment 3, x values ​​respectively: 0.018,0.022. Adopt the preparation method identical with embodiment 1 to carry out preparation embodiment 3, obtain Lu 3-x (Al 2.8 Ga 2.2 )O 12 :xCe phosphor.

[0074] Test the excitation spectrum of the fluorescent powder prepared in this embodiment 3, such as Figure 9 As shown, under the action of excitation light with a wavelength of about 445nm, the phosphor powder prepared in Example 3 has the strongest fluorescence intensity; Figure 10 The emission spectrum of the fluorescent powder prepared in Example 3 has an emission peak wavelength of 490-500 nm.

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Abstract

The invention relates to phosphor powder and a preparation method thereof and a luminescent device. A general chemical formula of the phosphor powder is (Lu3-x-zRz)(Al5-yGay)O12:xCe, wherein R is oneor more elements from Y, La, Tb, Gd and Dy, x is greater than 0.01 and less than 0.03, y is greater than 2.00 and less than 2.50, and z is greater than or equal to 0 and less than or equal to 1.00, and after the phosphor powder is excited, the emission peak-to-peak value wavelength is 490-550 nm. The phosphor powder fills up a blue-green spectrum gap, and can obtain the phosphor powder product having a superhigh color rendering index with a color rendering index being 95 or the above.

Description

technical field [0001] The invention belongs to the field of rare earth fluorescent materials, and in particular relates to a novel garnet-based high-efficiency green fluorescent powder, a preparation method thereof and a light emitting device. Background technique [0002] As the high-end lighting field has higher and higher requirements for the color rendering performance of white LEDs, in order to make up for the lack of red and green spectra in white LEDs, the market mainly uses LuAlO series or Y(AlGa)O series phosphors to make up for it. The green light spectrum is combined with nitride red powder to make up for the red light spectrum, so as to obtain white LED products with different high color rendering schemes. However, this solution is difficult to implement for white LEDs with ultra-high color rendering index, because the spectrum composed of LuAlO series or Y(AlGa)O series phosphors combined with nitride red powder lacks blue-green spectral components. There are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/7774H01L33/504Y02B20/00
Inventor 何锦华梁超符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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