Preparation method of blue green LED luminescent material

A luminescent 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: 2017-08-04

XIA MEN KE YU PHOTOELECTRIC CO LTD

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AI-Extracted 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 ...

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.

Application Domain

Luminescent compositions

Technology Topic

Color rendering indexChemistry +15

Image

Examples

Experimental program(5)

Example Embodiment

[0029] Example 1: Ba 5.99 Ga 7 Al 7 SiO 29 :The 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, alumina, silicon dioxide; then weigh 6% barium fluoride of the total weight of the raw materials; after ball milling and mixing all the raw materials, Sieving with a 120-mesh screen; put the mixed raw materials into a tube furnace, sintering at 1460°C for 8 hours under the protection of 100% nitrogen; the resulting product is ground and sieved and washed with 10% nitric acid by mass concentration. After washing with deionized water and drying to obtain Ba 5.99 Ga 7 Al 7 SiO 29 : 0.01Eu blue-green phosphor.

[0031] figure 1 Is the excitation spectrum of Example 1 of the present invention, such as figure 1 As shown, it shows that the excitation wavelength of the luminescent material is 300-450nm; figure 2 Is the emission spectrum of Example 1 of the present invention, such as figure 2 As shown, the emission wavelength of the luminescent material is 491nm; image 3 Is the SEM spectrum of Example 1 of the present invention, such as image 3 As shown, it shows that the main morphology of the luminescent material is nearly spherical, and the average particle size is 12 μm; Figure 4 This is the thermal stability diagram of Example 1 of the present invention, such as Figure 4 As shown, it shows that the luminescent material has higher thermal stability, and the luminous efficiency is only reduced by 10% after 225h accelerated aging experiment.

Example Embodiment

[0032] Example 2: Sr 5.99 Ga 2 Al 12 SiO 29 :The 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, alumina, silicon dioxide; then weigh 3% barium fluoride of the total weight of the raw materials; after ball milling and mixing all raw materials, Sieved 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% nitrogen; the resulting product is ground and sieved and washed with 10% nitric acid by mass concentration. Sr is obtained by washing with deionized water and drying 5.99 Ga 2 Al 12 SiO 29 : 0.01Eu blue-green phosphor.

Example Embodiment

[0034] Example 3: Sr 5.03 Ba 0.95 Ga 10 Al 4 SiO 29 :The 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 :The composition and stoichiometric ratio of 0.02Eu Weigh europium oxide, strontium carbonate, barium carbonate, gallium oxide, alumina, silicon dioxide; then weigh 1% barium fluoride of the total weight of the 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; the resulting product is ground and sieved with 10% nitric acid by mass concentration Wash, then wash with deionized water and dry to get Sr 5.03 Ba 0.95 Ga 10 Al 4 SiO 29 :0.02Eu blue-green phosphor.

PUM

Property	Measurement	Unit
The average particle size	12.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

good brightness
good thermal stability

Preparation method of blue green LED luminescent material

A luminescent 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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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