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a mn 4+ Activated polyfluoride red luminescent material and preparation method

A polyfluoride, red light-emitting technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problem that there are not many reports on polyfluorine compound phosphors

Active Publication Date: 2019-08-06
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Current information about Mn 4+ There are many types of doped fluoride phosphors, but they are mainly concentrated in A 2 MF 6 (A is Na, K, Rb, etc.; M is Ti, Si, Sn, Ge) and other hexafluoro compound red phosphors, and there are not many reports about other polyfluorinated compound phosphors

Method used

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  • a mn <sup>4+</sup> Activated polyfluoride red luminescent material and preparation method
  • a mn <sup>4+</sup> Activated polyfluoride red luminescent material and preparation method
  • a mn <sup>4+</sup> Activated polyfluoride red luminescent material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0014] Weigh barium carbonate: 1.97 g, hafnium dioxide: 1.052 g, potassium hexafluoromanganate: 0.062 g, then add 15 mL (40%) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 35 mL distilled water. Subsequently, the resulting solution was reacted in an autoclave at 180°C for 10 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours, and finally the white powder obtained was the final Ba 2 Hf 8 :Mn 4+ Luminescent material.

[0015] attached figure 1 Shown is the XRD diffraction pattern of this phosphor, which is consistent with the standard card JCPDS 52-0096 (Ba 2 Hf 8 ) are basically consistent, which indicates that the structure of our synthesized sample is similar to that of Ba 2 Hf 8 unanimous.

[0016] attached figure 2 Shown are the room temperature excitation spectrum (monitored at 627 nm) and emission spectrum (excited at 465 nm) of the sample. The sample has strong broadba...

Embodiment 2

[0018] Weigh barium carbonate: 0.996 g, hafnium dioxide: 1.052 g, potassium hexafluoromanganate: 0.124 g, then add 10 mL (40%) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 40 mL distilled water. Subsequently, the resulting solution was reacted in an autoclave at 160°C for 12 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours. Finally, the white powder obtained was the final Ba 2 Hf 8 :Mn 4+ Luminescent material.

Embodiment 3

[0020] Weigh barium fluoride: 0.875 g, hafnium dioxide: 0.999 g, potassium hexafluoromanganate: 0.186 g, then add 5 mL (40%) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 45 mL of distilled water. Subsequently, the resulting solution was reacted in an autoclave at 120°C for 8 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours. Finally, the white powder obtained was the final Ba 2 Hf 8 :Mn 4+ Luminescent material.

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Abstract

The invention relates to the field of inorganic functional materials and discloses a Mn<4+> activated polyfluoride red luminous material capable of being effectively excited by blue light, and a preparation method of the material. A chemical composition of the Mn<4+> activated polyfluoride red luminescent material capable of being effectively excited by the blue light is Ba2M1-xF8:xMn<4+>, wherein M is Zr or Hf, x is a mole percentage coefficient of corresponding Mn<4+>-doped ions relative to M<4+> ions, and x is greater than 0 and less than or equal to 0.10. The red luminous material mainly emits red light of about 628nm under the excitation of the blue light, and is high in luminous efficiency. The preparation method of the blue light excited high-color-purity red oxyfluoride luminous material is a hydrothermal method, and a synthesis process is simple.

Description

technical field [0001] The invention relates to a Mn that can be effectively excited by blue light 4+ An activated polyfluoride red luminescent material and a preparation method thereof, specifically, a polyfluoride red luminescent material applied to a blue light-emitting diode (emission wavelength is about 460 nm) and a preparation method thereof. It belongs to the field of preparation of inorganic functional materials. Background technique [0002] mn 4+ It is a kind of very good transition metal ion luminescent center, and its valence electron configuration is 3 d 3 . In an octahedral crystal field, Mn 4+ of d The tracks are split into two groups: t 2g track and e g orbit, which leads to strong broadband absorption in the ultraviolet and blue regions; and strong narrowband emission in the red region ( 2 E g → 4 A 2g ). Due to Mn 4+ of 2 E g The orbital energy is not affected by the strength of the crystal field, so its red emission wavelength is not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67
CPCC09K11/675
Inventor 汪正良杨兆峰王楠周强唐怀军罗利军郭俊明
Owner YUNNAN MINZU UNIV
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