Surface modification method of fluoride luminescent material, and fluoride luminescent material prepared by method

A luminescent material and surface modification technology, applied in luminescent materials, chemical instruments and methods, manganese halide, etc., can solve problems affecting the efficiency of phosphor use, difficulty in using fluoride phosphor, failure, etc.

Active Publication Date: 2020-05-19
XIAMEN INST OF RARE EARTH MATERIALS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods overcomes the disadvantage that fluoride luminescent materials are easily hydrolyzed, and are easily hydrolyzed in long-term use or in humid environments, resulting in reduced luminous efficiency or even failure.
Patent document US2007/0125984A1 reports that a layer of inorganic material (such as TiO 2 、Al 2 o 3 , SiO 2 ) as a protective film to improve the moisture resistance of the phosphor; but this water-phase coating technology is difficult to appl

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  • Surface modification method of fluoride luminescent material, and fluoride luminescent material prepared by method
  • Surface modification method of fluoride luminescent material, and fluoride luminescent material prepared by method
  • Surface modification method of fluoride luminescent material, and fluoride luminescent material prepared by method

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preparation example Construction

[0065] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0066] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0067] Instruments and Equipment

[0068] X-ray powder diffractometer (DMAX 2500PC, Rigaku) ​​was used for phase analysis; field emission scanning electron microscope (FE-SEM, Hitachi SU1510) was used to observe the sample morphology; FLS980 (Edinb...

preparation example 1-3

[0070] Preparation Example 1-3: A 2 MF 6 :Mn 4+ Phosphor powder preparation

preparation example 1

[0071] The synthesis methods of Preparation Examples 1-3 are the same, only differing in the types and amounts of raw materials, and the specific parameters are shown in Table 1 below. Take the K of Preparation Example 1 2 MF 6 :Mn 4+ phosphor as an example, first the K 2 MnF 6 Dissolve in hydrofluoric acid solution, after stirring for 1-10min, A 2 MF 6 Add the powder into the solution, continue to stir at room temperature for 30-90 minutes, and finally filter, then wash with acetone to remove any residual HF, and put it in an oven for 4 hours at 70°C to obtain the final powder. The excitation and emission spectra, fluorescence quantum yield and absorption efficiency of the product were tested by a FLS980 (Edinburgh Instrument) fluorescence spectrometer, and the results are shown in Table 2.

[0072] Table 1. Preparation Example 1-3 Synthetic Technical Parameters

[0073]

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Abstract

The invention relates to a surface modification method of a fluoride luminescent material, and the fluoride luminescent material prepared by the method. According to the invention, a matrix material AxMFy:Mn<4+> coated with an inorganic coating layer AxMFy, and an organic solution containing metal phosphate or alkoxy silane or an organic carboxylic acid substance or organic amine, and the obtainedmixed solution is subjected to evaporation drying to obtain the surface-modified fluoride luminescent material co-coated with the organic coating layer-inorganic coating layer; according to the coating method, the corrosion resistance of the fluoride fluorescent powder is remarkably improved, the luminous intensity retention rate and the quantum efficiency retention rate of the modified fluorescent powder reaches 85-95% in a high-temperature and high-humidity environment, and the fluoride fluorescent powder can be widely applied to the field of white light LED backlight source display; afterinorganic coating, the surface defects of the fluorescent powder are reduced, and the luminous intensity and the quantum yield of the fluorescent powder are improved by 5%-15%; after coating with theorganic coating layer, the luminous intensity reducing of the fluorescent powder is less than 3%; and the surface modification method provided by the invention has the advantages that the preparationtemperature is low, the time is short, the process is easy to control, and the surface modification method is suitable for industrial large-scale preparation.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials and lighting displays, in particular to a method for surface modification of fluoride luminescent materials and the prepared fluoride luminescent materials. Background technique [0002] As a new type of solid-state light source, white LED has the advantages of environmental protection, energy saving, high efficiency and fast response compared with traditional incandescent lamps and fluorescent lamps. The fourth generation of green light source after the light source. In the LED light source, the performance of the phosphor determines the technical indicators such as the luminous efficiency, color rendering index, color temperature and service life of the LED. Therefore, the phosphor plays a pivotal role in the white LED and has received widespread attention. At present, the most commonly used method is to combine the blue LED chip (luminous wavelength 440-480nm) with yel...

Claims

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Application Information

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IPC IPC(8): C09K11/67C09K11/61C09K11/66C09K11/02
CPCC09K11/675C09K11/617C09K11/665C09K11/025C09K11/02C09K11/66C09K11/67C09K11/61C09K11/00C09K11/77C09K11/645Y02B20/00C01G45/06C01P2006/60H01L29/22
Inventor 朱浩淼黄得财
Owner XIAMEN INST OF RARE EARTH MATERIALS
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