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A mn excited by blue light 4+ Doped fluoroytterbium red light material and preparation method thereof

A fluoroytterbium salt and blue light excitation technology is applied in the field of blue light excited Mn4+ doped fluoroytterbium salt red light material and its preparation, which can solve the problems of high color temperature of LED, lack of red light component, low color rendering index and the like, Achieve the effect of low cost, favorable for large-scale industrial production, and simple and easy preparation process

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream commercial white LED is excited by the blue chip to excite the yellow phosphor Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) combined to obtain white light. The emission spectrum of this type of white LED lacks red light components, resulting in high LED color temperature (CCT>4000K) and low color rendering index (CRI, Ra<80), which is difficult to meet indoor lighting and wide color gamut LCD. Display (LCD) Backlight Requirements

Method used

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  • A mn excited by blue light <sup>4+</sup> Doped fluoroytterbium red light material and preparation method thereof
  • A mn excited by blue light <sup>4+</sup> Doped fluoroytterbium red light material and preparation method thereof
  • A mn excited by blue light <sup>4+</sup> Doped fluoroytterbium red light material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] K 2 MnF 6 preparation of

[0034] Prepare K according to the method described in the document Angew.Chem-Ger.Edit.65,304 (1953) 2 MnF 6 , including the following steps:

[0035] Weigh 10g KHF 2 Dissolve in 50ml of hydrofluoric acid solution with a mass fraction of 49%, add 1g KMnO 4 , stir until the solids are completely dissolved, and at the same time cool the solution to 0-5°C, then gradually add a hydrogen peroxide solution with a mass fraction of 30%, until the solution turns from purple to yellow, stop the drop immediately, filter, and collect The precipitated sample was washed 3 times with acetone and dried at 80°C for 2 hours to obtain K 2 MnF 6 .

Embodiment 2

[0037] KYb 3 f 10 The preparation of matrix specifically comprises the following steps:

[0038] Weigh 1.97g Yb 2 o 3 and 4.68g KHF 2 , mixed and ground evenly, placed in a muffle furnace at 300°C and roasted for 6 hours, the obtained sample was successively washed with hydrofluoric acid with a mass fraction of 5%, anhydrous acetic acid, and absolute ethanol, and dried at 70°C to obtain KYb 3 f 10 matrix.

Embodiment 3

[0040] K 3 wxya 6 The preparation of matrix specifically comprises the following steps:

[0041] Weigh 1.97g Yb 2 o 3 and 2.34g KHF 2 , mixed and ground evenly, placed in a muffle furnace at 600°C and roasted for 2 hours, the obtained sample was washed successively with 5% hydrofluoric acid, anhydrous acetic acid, and absolute ethanol, and dried at 70°C to obtain K 3 wxya 6 matrix.

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Abstract

The invention discloses a blue light excited Mn<4+>-doped ytterbium fluorate red-light-emitting material and a preparation method thereof. The chemical formula of the Mn<4+>-doped ytterbium fluorate red-light-emitting material is AxYbyFz:Mn<4+>, wherein A is one or more of Li, Na, K, Rb, Cs, NH4, Be, Mg, Ca, Sr, Ba and Zn, x is larger than or equal to 1 and is smaller than or equal to 3, y is larger than or equal to 1 and smaller than or equal to 3, and z is larger than or equal to 6 and smaller than or equal to 10. The Mn<4+>-doped ytterbium fluorate red-light-emitting material has higher luminous efficiency, can be effectively excited by ultraviolet light of 300-400 nm and blue light of 400-500 nm, produces narrow-band red light emission with the strongest emission peak located in a wavelength range being 620-640 nm, and can be widely applied to the fields of white light LED illumination and backlight display. The Mn<4+>-doped ytterbium fluorate red-light-emitting material is prepared with an ion exchange method, the preparation technology is simple, time consumption is low, and a small amount of hydrofluoric acid is used.

Description

technical field [0001] The invention relates to the technical field of preparation of red light materials for white light LEDs, in particular to a blue light-excited Mn 4+ Doped fluoroytterbium salt red light material and preparation method thereof. Background technique [0002] Compared with traditional lighting sources such as incandescent lamps and fluorescent lamps, white LEDs have outstanding advantages such as fast response, no flicker, long service life, energy saving and environmental protection, and are widely used in the field of solid-state lighting and backlight display light sources. At present, the mainstream commercial white LED is excited by the blue chip to excite the yellow phosphor Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) combined to obtain white light. The emission spectrum of this type of white LED lacks red light components, resulting in high LED color temperature (CCT>4000K) and low color rendering index (CRI, Ra<80), which is difficult to meet in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/85
Inventor 张勤远周亚运宋恩海
Owner SOUTH CHINA UNIV OF TECH