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A kind of preparation method of blue-green LED luminescent material

A luminous material, blue-green technology, applied in the field of materials, can solve the problems of lack of spectrum, LED phosphors are difficult to achieve color rendering index, etc., and achieve the effect of simple preparation process, good brightness, and easy industrial production

Active Publication Date: 2019-04-09
广东科煜光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the technology of using blue light, purple light or ultraviolet light LED with YAG yellow-green phosphor and nitride red powder to produce high color rendering white light is relatively mature, but for LED packages with a color rendering index above 95, due to the blue-green The lack of spectrum makes it difficult for existing packaging technologies and LED phosphors to achieve a color rendering index of 95-100

Method used

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  • A kind of preparation method of blue-green LED luminescent material
  • A kind of preparation method of blue-green LED luminescent material
  • A kind of preparation method of blue-green LED luminescent material

Examples

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Embodiment 1

[0029] Example 1: Ba 5.99 Ga 7 al 7 SiO 29 : Preparation example of 0.01Eu luminescent material

[0030] According to the chemical formula Ba 5.99 Ga 7 al 7 SiO 29 : 0.01Eu composition and stoichiometric ratio Weigh europium oxide, barium carbonate, gallium oxide, aluminum oxide, silicon dioxide; then weigh 6% barium fluoride of the total weight of raw materials; mix all raw materials by ball milling, Sieve with a 120-mesh screen; put the mixed raw materials into a tube furnace, and sinter at 1460°C for 8 hours under 100% nitrogen protection; the resulting product is ground and sieved, washed with 10% nitric acid, and then Washed with deionized water and dried to obtain Ba 5.99 Ga 7 al 7 SiO 29 : 0.01Eu blue-green phosphor.

[0031] figure 1 It is the excitation spectrogram of embodiment 1 of the present invention, as figure 1 As shown, it shows that the excitation wavelength of the luminescent material is 300-450nm; figure 2 It is the emission spectrogram of e...

Embodiment 2

[0032] Example 2: Sr 5.99 Ga 2 al 12 SiO 29 : Preparation example of 0.01Eu luminescent material

[0033] According to the chemical formula Sr 5.99 Ga 2 al 12 SiO 29 : 0.01Eu composition and stoichiometric ratio Weigh europium oxide, strontium carbonate, gallium oxide, aluminum oxide, silicon dioxide; then weigh 3% barium fluoride of the total weight of raw materials; mix all raw materials by ball milling, Sieve with a 120-mesh screen; put the mixed raw materials into a tube furnace, and sinter at 1480°C for 10 hours under 100% nitrogen protection; the resulting product is ground and sieved, washed with 10% nitric acid, and then After washing with deionized water and drying to obtain Sr 5.99 Ga 2 al 12 SiO 29 : 0.01Eu blue-green phosphor.

Embodiment 3

[0034] Example 3: Sr 5.03 Ba 0.95 Ga 10 al 4 SiO 29 : Preparation example of 0.02Eu luminescent material

[0035] According to the chemical formula Sr 5.03 Ba 0.95 Ga 10 al 4 SiO 29 : 0.02Eu composition and stoichiometric ratio Weigh europium oxide, strontium carbonate, barium carbonate, gallium oxide, aluminum oxide, silicon dioxide; then weigh 1% barium fluoride of the total weight of raw materials; ball mill all raw materials After mixing, sieve with a 120-mesh screen; put the mixed raw materials into a tube furnace, and sinter at 1480°C for 10 hours under the protection of 100% argon; Washed, then washed with deionized water and dried to obtain Sr 5.03 Ba 0.95 Ga 10 al 4 SiO 29 : 0.02Eu blue-green phosphor.

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Abstract

The invention relates to a preparation method of a blue green LED luminescent material. The chemical structural formula of the blue green LED luminescent material is M6-x(GayAl1-y)14SiO29:xEu, wherein M is at least one or several of group II alkali earth metal elements, x is not less than 0.001 and not more than 1, and y is not less than 0 and not more than 1. The preparation method comprises the following steps: weighing europium oxide, an M-containing compound, gallium oxide, alumina and silica according to the composition and the stoichiometric ratio of the chemical formula; adding a flux to the above raw materials, carrying out ball-milling mixing on the raw materials and the flux, and screening the obtained mixture by a 120 mesh screen; calcining the screened raw materials in a sintering furnace under the protection of inert gas atmosphere; and serially processing the obtained sintered product to obtain the blue green LED luminescent material. The synthesized target luminescent material has good brightness and good thermal stability, and the color rendering index can reach 95 or more.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of a blue-green LED luminescent material. Background technique [0002] In the field of lighting technology, solid-state lighting, especially white lighting using semiconductor light-emitting diodes (LEDs), has been expected, and extensive research and development has been ongoing. As an emerging illuminant, semiconductor lighting has the advantages of high electro-optical efficiency, small size, long life, low voltage, energy saving and environmental protection, and is the best choice for the next generation of lighting. At present, the mixture of cerium-activated yttrium aluminum garnet (YAG) fluorescent material and epoxy resin is mainly coated on the blue LED to generate white light through the principle of complementary color. Or adding nitride red powder to YAG can achieve a color rendering index of more than 85, but because the shortest wavelength o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCC09K11/7734
Inventor 李辉王惠璇唐勇
Owner 广东科煜光电有限公司
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