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High-performance narrowband fluorescent powder and preparation method thereof

A fluorescent powder, high-performance technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of low external quantum efficiency and instability of red fluorescent powder, achieve low cost, improve moisture resistance, and excellent performance Effect

Active Publication Date: 2019-02-01
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects or deficiencies of low external quantum efficiency and instability in high-temperature and high-humidity environments of red phosphors in the prior art, and provide a preparation method of high-performance narrow-band phosphors

Method used

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  • High-performance narrowband fluorescent powder and preparation method thereof
  • High-performance narrowband fluorescent powder and preparation method thereof
  • High-performance narrowband fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1~4

[0041] This example provides Cs 2 SiF 6 : Mn 4+ The fluorescent powder is prepared by the following preparation method.

[0042] (1)K 2 MnF 6 preparation of

[0043] Prepare K according to the method described in the document Angew. Chem-Ger. Edit. 65, 304-304 (1953) 2 MnF 6 crystals.

[0044] 0.45 g KMnO 4 and 9 g KHF 2 Dissolve in 30 ml of hydrofluoric acid (49 %), stir for 30 minutes, then gradually drop into about 1.2 ml of hydrogen peroxide (30 wt. %), gradually form a yellow precipitate in the solution, filter the solution to obtain the precipitate, and use acetone After cleaning, bake at 80°C for 2 hours to get K 2 MnF 6 .

[0045] Each example uses K 2 MnF 6 As the manganese source, other manganese sources, such as cesium hexafluoromanganate, also have the same effect.

[0046] (2) Cs before passivation 2 SiF 6 : Mn 4+ Phosphor powder preparation

[0047] A certain amount of potassium hexafluoromanganate (K 2 MnF 6 ) was dissolved in 6.5 ml HF (40 ...

Embodiment 5

[0054] Example 5 is consistent with Example 3 except that the silicon-containing compound selected is ethyl orthosilicate (0.5208 g). The prepared Cs 2 SiF 6 :Mn 4+ The performance of phosphor powder is similar to that of Example 3.

Embodiment 6

[0055] Example 6 is consistent with Example 3 except that the selected cesium-containing compound is cesium hydroxide (0.3748g). The prepared Cs 2 SiF 6 :Mn 4+ The performance of phosphor powder is similar to that of Example 3.

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Abstract

The invention relates to high-performance narrowband fluorescent powder and a preparation method thereof. The preparation method comprises: S1, dissolving hexafluoromanganate in an HF solution, addinga silicon-containing compound and a cesium-containing compound under stirring to obtain a mixture; S2, carrying out a co-precipitation reaction at a temperature of -40 to -10 DEGC to obtain a precipitate, carrying out centrifugation, washing, and drying to obtain a Cs2SiF6:Mn<4+> fluorescent powder initial product; and S3, adding the Cs2SiF6:Mn<4+> fluorescent powder initial product into an acidsolution, adding a reducing solution under stirring, stirring, carrying out centrifugation, washing, and drying to obtain the high-performance narrowband fluorescent powder. According to the present invention, the preparation method has advantages of low cost, simplicity, easy operation and excellent performance, and is suitable for large-scale industrial production; and the prepared high-performance narrowband fluorescent powder has advantages of high quantum efficiency and good moisture resistance.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a high-performance narrow-band fluorescent powder and a preparation method thereof. Background technique [0002] White LED has many advantages such as long service life, low power consumption, fast response, small size, energy saving and environmental protection, and can be widely used in lighting and display backlight and other fields. At present, mainstream white LEDs are realized by mixing blue light and yellow light. Due to insufficient red light components, their color rendering is very low, which seriously affects the quality of lighting light. At the same time, the color gamut of the display backlight obtained in this way is relatively narrow, which cannot truly restore the color of the image. In order to obtain high color rendering white light and a wide color gamut backlight device, it is necessary to add appropriate red phosphor. [0003] In...

Claims

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Application Information

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IPC IPC(8): C09K11/61H01L33/50
CPCH01L33/504C09K11/616
Inventor 王静刘永黄霖
Owner SUN YAT SEN UNIV
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