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Preparation method of fluoride red phosphor used for blue-light semiconductor light emitting diode

A technology of light-emitting diodes and semiconductors, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of harsh preparation conditions of phosphors and high prices of phosphors

Active Publication Date: 2017-04-05
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the red phosphors that can be effectively excited by blue light are mainly concentrated on Eu2+ / Ce3+ activated nitrogen (oxygen) oxides, but the preparation conditions of such phosphors are harsh, resulting in expensive phosphors, so the development of new and efficient phosphors that can be excited by blue light Phosphor powder has important research significance and application prospects

Method used

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  • Preparation method of fluoride red phosphor used for blue-light semiconductor light emitting diode
  • Preparation method of fluoride red phosphor used for blue-light semiconductor light emitting diode
  • Preparation method of fluoride red phosphor used for blue-light semiconductor light emitting diode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 0.332 g and Nb 2 o 5 Dissolve in 2.5ml hydrofluoric acid (40wt%), stir at room temperature for 60 minutes until completely dissolved, add 0.062g potassium hexafluoromanganate to this solution and react for 30 minutes; then add 0.145g potassium fluoride solid and continue stirring for 50 minutes. 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 2 NbF 7 :Mn 4+ .

[0019] The XRD diffraction pattern of this fluorescent powder is attached figure 1 shown, with standard card JCPDS 22-0839 (K 2 NbF 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.

[0020] attached figure 2 Shown are the room temperature excitation spectrum (monitored at 628 nm) and emission spectrum (ex...

Embodiment 2

[0023] Weigh 0.552 g and Ta 2 o 5 Dissolve in 2.5ml hydrofluoric acid (40wt%), stir at room temperature for 40 minutes until completely dissolved, add 0.016g potassium hexafluoromanganate to this solution and react for 40 minutes; then add 0.145g potassium fluoride solid and continue stirring for 60 minutes. 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 2 TaF 7 :Mn 4+ .

[0024] The XRD diffraction pattern of this fluorescent powder is attached Figure 4 shown, with the standard card JCPDS 84-1255 (K 2 TaF 7 ) consistent, our synthesized samples have a single crystal phase.

[0025] attached Figure 5 Shown are the room temperature excitation spectrum (monitored at 626 nm) and emission spectrum (excited at 485 nm) of the sample. The sample has strong broadband excitation in both ultraviolet and blue light regions. U...

Embodiment 3

[0028] Weigh 0.332 g and Nb 2 o 5Dissolve in 2.5ml hydrofluoric acid (40wt%), stir at room temperature for 50 minutes until completely dissolved, add 0.016g potassium hexafluoromanganate to this solution and react for 40 minutes; then add 0.290g potassium fluoride solid and continue stirring for 50 minutes. 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 2 NbF 7 :Mn 4+ .

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Abstract

The invention relates to the field of white light emitting diodes, and discloses fluoride red phosphor used for a blue-light semiconductor light emitting diode and a preparation method of the fluoride red phosphor. The chemical composition of the fluoride red phosphor used for the blue-light semiconductor light emitting diode is K<2>M<1-x>F<7:x>Mn4+, wherein M is Nb or Ta, and x is the mole percentage coefficient of correspondingly doped Mn4+ ions to M5+ ions, and is larger than zero and no larger than 0.10. The red phosphor related in the invention mainly emits red light with the wave length being about 628 nm when being excited by blue light, and the luminous efficiency is high. The high-color-purity red fluoride luminescent material excited by blue light is prepared through an ion exchange method at a room temperature. The preparation method is simple in synthesizing process and suitable for industrial mass production.

Description

technical field [0001] The invention relates to a fluoride red phosphor powder for blue light semiconductor light-emitting diodes (LED) and a preparation method thereof, specifically, a Mn phosphor that can be excited by blue light 4+ Doped fluoride red phosphor and preparation method thereof. It belongs to the field of preparation of inorganic functional materials. Background technique [0002] With the development of the LED industry, white LED lighting is gradually becoming part of people's daily life. At present, white light LED devices are still obtained through the "fluorescent conversion method", that is, through the yellow phosphor YAG:Ce 3+ Absorbing blue light from the LED chip produces yellow light emission, which is combined with the chip's blue light to obtain white light. Due to the yellow phosphor YAG:Ce 3+ The emission in the red light area is very weak, and it is necessary to add an appropriate amount of red phosphor to improve the color rendering index ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
CPCC09K11/675
Inventor 汪正良王楠杨至雨周强唐怀军罗利军郭俊明
Owner YUNNAN MINZU UNIV
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