Blue-light-excited Mn<4+>-doped fluoscandate red-light-emitting material and preparation method thereof

A fluoroscandate, blue light excitation technology, applied in luminescent materials, chemical instruments and methods, electrical components and other directions, can solve the problems of high color temperature of LED, lack of red light components, low color rendering index, etc. It is beneficial to large-scale industrial production, and the preparation process is simple and easy to implement.

Inactive Publication Date: 2018-02-23
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 color temperature (CCT>4000K) and low color rendering index (CRI, Ra<80). It is difficult to meet the requirements of indoor lighting and wide color gamut LCD. Display (LCD) Backlight Requirements

Method used

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  • Blue-light-excited Mn&lt;4+&gt;-doped fluoscandate red-light-emitting material and preparation method thereof
  • Blue-light-excited Mn&lt;4+&gt;-doped fluoscandate red-light-emitting material and preparation method thereof
  • Blue-light-excited Mn&lt;4+&gt;-doped fluoscandate red-light-emitting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] K 2 MnF 6 preparation of

[0038] Prepare K according to the method described in the document Angew.Chem-Ger.Edit.65,304 (1953) 2 MnF 6 , including the following steps:

[0039] 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, and collect the precipitated sample by filtration. After washing 3 times with acetone and drying at 80°C for 2 hours, K 2 MnF 6 .

Embodiment 2

[0041] KSC 2 f 7 :Mn 4+ The preparation of the red light material specifically includes the following steps:

[0042] Weigh 0.69g Sc 2 o 3 with 3.42g NH 4 HF 2 , added to water, placed in a water bath with a temperature of 80°C and heated for 6 hours. After the mixture was cooled to room temperature, 0.12 g of K 2 MnF 6 React for 30 minutes, finally add 5.81g KF to precipitate the sample, continue to stir for 30 minutes, filter, the resulting precipitated sample is washed and dried to obtain KSc 2 f 7 :Mn 4+ red light material.

[0043] Prepared sample KSc 2 f 7 :Mn 4+ The XRD diffraction pattern of the red light material is as follows figure 1 shown by figure 1 It can be seen that the diffraction peak of the sample is consistent with that of the standard card JCPDS 39-0784 (KSc 2 f 7 ), no heterophase diffraction peaks were observed, indicating that the synthesized red light material samples were phase-pure.

[0044] Prepared sample KSc 2 f 7 :Mn 4+ The r...

Embodiment 3

[0046] (NH 4 ) 3 ScF 6 :Mn 4+ The preparation of the red light material specifically includes the following steps:

[0047] Weigh 0.69g Sc 2 o 3 with 1.71g NH 4 HF 2 , added to water, placed in an oil bath with a temperature of 110°C and heated for 2 hours. After the mixture was cooled to room temperature, 0.12 g of K 2 MnF 6 Reacted for 30 minutes, filtered, and the resulting precipitated sample was washed and dried to obtain (NH 4 ) 3 ScF 6 :Mn 4+ red light material.

[0048] Prepared samples (NH 4 ) 3 ScF 6 :Mn 4+ The XRD diffraction pattern of the red light material is as follows image 3 shown by image 3 It can be seen that the diffraction peak of the sample is the same as that of the standard card JCPDS40-0595 ((NH 4 ) 3 ScF 6 ), no heterophase diffraction peaks were observed, indicating that the synthesized red light material samples were phase-pure.

[0049] Prepared samples (NH 4 ) 3 ScF 6 :Mn 4+ The room temperature excitation and emission ...

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Abstract

The invention discloses a blue-light-excited Mn<4+>-doped fluoscandate red-light-emitting material and a preparation method thereof. The blue-light-excited Mn<4+>-doped fluoscandate red-light-emittingmaterial has a chemical formula of A<x>Sc<y>F<z>: Mn<4+>, wherein A is more than one selected from a group consisting of Li, Na, K, Rb, Cs, NH<4>, Be, Mg, Ca, Sr, Ba and Zn; x is no less than 1 and no more than 3; y is no less than 1 and no more than 3; and z is no less than 5 and no more than 7. The Mn<4+>-doped fluoscandate red-light-emitting material can be effectively excited by ultraviolet light with a wavelength of 300 to 400 nm and blue light with a wavelength of 400 to 500 nm and generate narrowband red light emission in a wavelength band of 575 to 675 nm, has high luminous efficiencyand is applicable to the fields of white-light LED lighting and backlight displays. According to the invention, a co-precipitation method is adopted to prepare the Mn<4+>-doped fluoscandate red-light-emitting material; and the preparation method has the advantages of simple preparation process, short preparation time, low usage amount of hydrofluoric acid, etc.

Description

technical field [0001] The invention relates to the technical field of preparation of red light powder materials for LEDs, in particular to a blue light-excited Mn 4+ Doped fluorine scandate 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 consumption response, no flicker, long life, energy saving and environmental protection, and become a new generation 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 indoor ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85H01L33/50
CPCC09K11/7704C09K11/7705H01L33/502
Inventor 张勤远周亚运宋恩海
Owner SOUTH CHINA UNIV OF TECH
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