Novel Mn<4+> activated high color purity fluoride red light emitting material preparation method

A technology of red light-emitting and light-emitting materials, applied in the fields of light-emitting materials, chemical instruments and methods, etc., can solve the problems of high color temperature, lack of spectrum in the red light region, poor color rendering index, etc.

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

AI Technical Summary

Problems solved by technology

At present, commercial white LEDs are still made by combining GaN-based blue LED chips with commercial yellow phosphor YAG:Ce 3+ White light can be obtained by compounding, but this kind of white light LED has high color temperature, poor color rendering index and low luminous efficiency due to the lack of spectrum in the red light region.

Method used

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  • Novel Mn&lt;4+&gt; activated high color purity fluoride red light emitting material preparation method
  • Novel Mn&lt;4+&gt; activated high color purity fluoride red light emitting material preparation method
  • Novel Mn&lt;4+&gt; activated high color purity fluoride red light emitting material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 0.062g of potassium hexafluoromanganate and dissolve it in 5 mL of hydrofluoric acid (40 wt %), stir at room temperature until completely dissolved, add 0.760 mL of hexafluorozirconic acid (45 wt %) aqueous solution to this solution, stir for 10 min; Then add 1.305g KF solid and continue to stir for 30 min. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 ZrF 7 :Mn 4+ .

[0016] The XRD diffraction pattern of this fluorescent powder is attached figure 1 shown, with standard card JCPDS 10-0372 (K 3 ZrF 7 ) 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.

[0017] attached figure 2 Shown are the room temperature excitation spectrum (monitored at 627 nm) and emission s...

Embodiment 2

[0020] Weigh 0.031g of potassium hexafluoromanganate and dissolve it in 5 mL of hydrofluoric acid (40 wt %), stir at room temperature until completely dissolved, add 0.760 mL of hexafluorozirconic acid (45 wt %) aqueous solution to this solution, stir for 10 min; then add 1.740g of potassium fluoride solid and continue stirring for 60 min. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 ZrF 7 :Mn 4+ .

Embodiment 3

[0022] Weigh 0.093g of potassium hexafluoromanganate and dissolve it in 10 mL of hydrofluoric acid (40 wt %), stir at room temperature until completely dissolved, add 0.760 mL of hexafluorozirconic acid (45 wt %) aqueous solution to this solution, stir for 10 min; then add 1.305g of potassium fluoride solid and continue stirring for 30 min. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 ZrF 7 :Mn 4+ .

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Abstract

The invention relates to the field of white light emitting diodes, and discloses a preparation method of a novel Mn<4+> doped high color purity red fluoride light emitting material suitable for blue light excitation, wherein the chemical composition is K3Zr1-xF7:xMn<4+>, x is the mole percent coefficient of the corresponding doped Mn<4+> ions relative to Zr<4+> ions, and x is more than 0 and is less than or equal to 0.10. According to the present invention, the red light emitting material mainly emits 627 nm red light under blue light excitation, the light emitting efficiency is high, and the color purity is good; the novel Mn<4+> doped high color purity red fluoride light emitting material is prepared by using the ion-exchange method; and the synthesis process of the preparation method is simple, and the preparation method is suitable for industrial large-scale production.

Description

technical field [0001] The present invention relates to a kind of Mn 4+ The invention relates to a method for preparing an activated high-color-purity fluoride red luminescent material, specifically, a fluoride red luminescent material for a blue light semiconductor diode (LED) and a preparation method thereof. It belongs to the field of preparation of inorganic functional materials. Background technique [0002] White-light-emitting diode (LED, white-light-emitting diode) is gradually becoming the lighting source used in people's daily life due to its energy saving, high light efficiency and many other advantages. At present, commercial white LEDs are still made by combining GaN-based blue LED chips with commercial yellow phosphor YAG:Ce 3+ White light is obtained by compounding, but this type of white LED lacks the spectrum of the red light region, resulting in a high color temperature, poor color rendering index, and low luminous efficiency. In order to improve the app...

Claims

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Application Information

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IPC IPC(8): C09K11/67
Inventor 汪正良周亚运周强刘永杨慧苏长伟郭俊明
Owner YUNNAN MINZU UNIV
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