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Blue-light-excited Mn4<+>-doped fluorine bismuthate red emitting material and preparation method thereof

A technology of fluorobismuth salt and blue light excitation, which is applied in luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve the problems of lack of red light components, difficulty in meeting requirements, high color temperature of light sources, etc., and is conducive to large-scale industrialization The effect of low production, low cost and uniform particle size distribution

Inactive Publication Date: 2018-03-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current mainstream commercial white LED consists of blue chip and yellow phosphor Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) combined and packaged. This type of white LED emits a lack of red light components in the emission spectrum, resulting in a high color temperature of the light source (CCT>4000K) and a low color rendering index (CRI, Ra<80), which is difficult to meet indoor lighting and wide color gamut. Liquid crystal display (LCD) backlight requirements

Method used

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  • Blue-light-excited Mn4&lt;+&gt;-doped fluorine bismuthate red emitting material and preparation method thereof
  • Blue-light-excited Mn4&lt;+&gt;-doped fluorine bismuthate red emitting material and preparation method thereof
  • Blue-light-excited Mn4&lt;+&gt;-doped fluorine bismuthate red emitting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] K 2 MnF 6 preparation of

[0040] Prepare K according to the method described in the document Angew.Chem-Ger.Edit.65,304 (1953) 2 MnF 6 , including the following steps:

[0041] 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 the obtained The yellow precipitate was washed 3 times with acetone, and then dried at 80 °C for 2 h to obtain K 2 MnF 6 .

Embodiment 2

[0043] K 0.3 Bi 0.7 f 2.4 :Mn 4+ The preparation of the red light material specifically includes the following steps:

[0044] Weigh 2.33g Bi 2 o 3 Add to 20ml 49wt% hydrofluoric acid solution, add 0.12g K 2 MnF 6 And reacted at room temperature for 30 minutes, then added 1.77g KF and continued to stir for 60 minutes, filtered, and the resulting precipitate was washed and dried to obtain Mn 4+ Doped fluorobismuth red light material.

[0045] Prepared sample K 0.3 Bi 0.7 f 2.4 :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 33-1280 (K 0.3 Bi 0.7 f 2.4 ), there is no heterophase diffraction peak, indicating that the synthesized red light material sample is a pure phase.

[0046] Prepared sample K 0.3 Bi 0.7 f 2.4 The room temperature excitation and emission spectra of red light materials are shown in ...

Embodiment 3

[0049] K 0.3 Bi 0.7 f 2.4 :Mn 4+ The preparation of the red light material specifically includes the following steps:

[0050] Weigh 2.33g Bi 2 o 3 with 2.34g KHF 2 Mix and grind evenly, place in a muffle furnace with a temperature of 300°C and bake for 6 hours, add the obtained sample to 10ml 49wt% hydrofluoric acid solution, and then add 0.12g K 2 MnF 6 And reacted at room temperature for 30 minutes, filtered, and the resulting precipitate was washed and dried to obtain K 0.3 Bi 0.7 f 2.4 :Mn 4+ red light material.

[0051] Prepared sample K 0.3 Bi 0.7 f 2.4 :Mn 4+ For the XRD diffraction pattern of red light materials, see figure 1 , the diffraction peak of the sample and the standard card JCPDS 33-1280 (K 0.3 Bi 0.7 f 2.4 ), there is no heterophase diffraction peak, and the synthesized red light material sample is a pure phase.

[0052] Prepared sample K 0.3 Bi 0.7 f 2.4 :Mn 4+ The room temperature excitation spectrum and emission spectrum of red li...

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Abstract

The invention discloses a blue-light-excited Mn4<+>-doped fluorine bismuthate red emitting material and a preparation method thereof. The chemical formula of the Mn4<+>-doped fluoride red emitting material is A(i)x( / i)Bi(i)y( / i)F(i)z( / i):Mn4<+>, wherein A is more than one of Li, Na, K, Rb, Cs, NH4, Be, Mg, Ca, Sr, Ba and Zn, (i)x( / i) is greater than 0 and less than or equal to 0.5, (i)y( / i) is greater than 0.5 and less than or equal to 1, and (i)z( / i) is greater than 2 and less than or equal to 3. The Mn4<+>-doped fluorine bismuthate red emitting material has the good luminous efficiency, andcan be excited by the blue light to emit the red light, and extensively applied to the fields of white light LED illumination and backlight display, and is capable of effectively improving the coloration performance of the current white light LED. The Mn4<+>-doped fluorine bismuthate red emitting material is prepared by using a coprecipitation method or an ion exchange method. The preparation technology is simple and easy, the condition is moderate, the cost is low, the usage amount of a hydrofluoric acid is small, and the material is suitable for the large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of fluorescent powder materials for LEDs, in particular to a blue light-excited Mn 4+ Doped fluorobismuth 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 energy saving, environmental protection, fast response, no flicker, and long service life, and are known as a new generation of solid-state lighting sources. The current mainstream commercial white LED consists of blue chip and yellow phosphor Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) combined and packaged. This type of white LED emits a lack of red light components in the emission spectrum, resulting in a high color temperature of the light source (CCT>4000K) and a low color rendering index (CRI, Ra<80), which is difficult to meet indoor lighting and wide color g...

Claims

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Application Information

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IPC IPC(8): C09K11/74
CPCC09K11/7435Y02B20/00
Inventor 张勤远周亚运宋恩海
Owner SOUTH CHINA UNIV OF TECH
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