Uniform-appearance and high-color-purity Mn4+ activated red fluoride luminescent material prepared by using micro-emulsion method

A technology with red luminescence and high color, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., and can solve problems such as insufficient preparation methods of fluoride red phosphors

Inactive Publication Date: 2017-02-22
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is for the existing Mn 4+ Insufficient preparation of activ

Method used

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  • Uniform-appearance and high-color-purity Mn4+ activated red fluoride luminescent material prepared by using micro-emulsion method
  • Uniform-appearance and high-color-purity Mn4+ activated red fluoride luminescent material prepared by using micro-emulsion method
  • Uniform-appearance and high-color-purity Mn4+ activated red fluoride luminescent material prepared by using micro-emulsion method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First add 0.20 g of dodecylbenzenesulfonic acid to 10 ml of hydrofluoric acid solution containing 0.12 g of sodium hexafluoromanganate and stir for 10 to 30 minutes, then dissolve 0.20 g of silicon dioxide in 5 ml of hydrofluoric acid solution and added to the above solution to continue stirring for 10 to 30 minutes. Finally, add 0.50 g of sodium fluoride and continue stirring for 60 to 120 minutes. The resulting precipitate was washed with anhydrous methanol, and dried in a vacuum oven for 24 hours to obtain the desired Na 2 SiF 6 :Mn 4+ product.

[0015] The XRD diffraction pattern of this fluorescent powder is attached figure 1 shown, with the standard card JCPDS 33-1280 (Na 2 SiF 6 ) in contrast, the two are completely consistent, and no diffraction peaks of any heterogeneous phases are observed, which indicates that the samples we synthesized have a single crystal phase.

[0016] Accompanying drawing 2 shows the scanning electron microscope picture of sample...

Embodiment 2

[0020] First add 0.20 g of dodecylbenzenesulfonic acid to 10 ml of hydrofluoric acid solution containing 0.12 g of sodium hexafluoromanganate and stir for 10 to 30 minutes, then dissolve 0.40 g of titanium dioxide in 5 ml of hydrofluoric acid solution and Add to the above solution and continue to stir for 10-30 minutes. Finally, add 0.50 g of sodium fluoride and continue stirring for 60 to 120 minutes. The resulting precipitate was washed with anhydrous methanol, and dried in a vacuum oven for 24 hours to obtain the desired Na 2 TiF 6 :Mn 4+ product.

Embodiment 3

[0022] First add 0.20 g of dodecylbenzenesulfonic acid to 10 ml of hydrofluoric acid solution containing 0.12 g of sodium hexafluoromanganate and stir for 10 to 30 minutes, then dissolve 0.53 g of germanium dioxide in 5 ml of hydrofluoric acid solution and added to the above solution to continue stirring for 10 to 30 minutes. Finally, add 0.50 g of sodium fluoride and continue stirring for 60 to 120 minutes. The resulting precipitate was washed with anhydrous methanol, and dried in a vacuum oven for 24 hours to obtain the desired Na 2 GeF 6 :Mn 4+ product.

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Abstract

The invention relates to the field of white light emitting diodes, and discloses a preparation method for a red fluoride luminescent material which is suitable for blue light excitation, high in color purity and is activated by Mn4+. The red fluoride luminescent material which is suitable for blue light excitation and high in color purity is prepared from a chemical composition of A2X1-xF6 :xMn4+, wherein A is one or any combination of two from Na, K, Rb, and Cs; M is one or two of Ti, Si, Ge and Zr; x is a coefficient of the molar percentage of corresponding doped Mn4+ ions relative to X4+ ions, and x is larger than 0 and smaller than or equal to 0.10. When the related red luminescent material is excitated by blue light, red light with the wavelength of 633 nm or 627 nm is mainly emitted, the luminous efficiency is high, and the color purity is high. The related red luminescent material which is excitated by blue light and high in color purity is prepared through a micro-emulsion method. The preparation method is simple in synthetic process, convenient to operate and suitable for large-scale industrialized production.

Description

technical field [0001] The present invention relates to a kind of Mn 4+ A new method for preparing activated high-color-purity fluoride red luminescent materials, specifically, a fluoride red luminescent material for blue light semiconductor diodes (LEDs) and its new preparation method. It belongs to the field of preparation of inorganic functional materials. Background technique [0002] The white light LED lighting source currently on the market is mainly through the commercial yellow phosphor YAG:Ce 3+ Coated on GaN-based blue LED chips to obtain, but due to YAG:Ce 3+ Yellow powder emits weakly in the red light area, resulting in high color temperature and poor color rendering index of this type of white LED. In order to improve the emission intensity of the red light component of the white LED device, an effective method is to add an appropriate amount of red phosphor powder in the manufacturing process of the white LED device, so as to improve the luminous performanc...

Claims

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Application Information

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IPC IPC(8): C09K11/61C09K11/67C09K11/66
Inventor 汪正良周亚运周强刘永谭慧英张秋函苏长伟郭俊明
Owner YUNNAN MINZU UNIV
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