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Phosphor and method of producing phosphor

A manufacturing method and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of insufficient moisture resistance, and achieve the effect of excellent moisture resistance

Active Publication Date: 2022-01-21
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, Mn known as a red phosphor 4+ Activated fluoride phosphors (such as K 2 SiF 6 :Mn 4+ etc.) the moisture resistance is not necessarily sufficient, and the improvement of the moisture resistance of the fluoride phosphor is being studied

Method used

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  • Phosphor and method of producing phosphor
  • Phosphor and method of producing phosphor
  • Phosphor and method of producing phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] [KMF(K 2 MnF 6 ) preparation]

[0057] Weigh 800 mL of hydrofluoric acid (concentration: 40% by mass) in a fluororesin beaker with a capacity of 2000 mL, and dissolve 260.00 g of potassium hydrogen fluoride powder (manufactured by Kanto Chemical Co., Ltd.) and 12.00 g of potassium permanganate powder ( Kanto Chemical Co., Ltd.), thereby preparing a hydrofluoric acid aqueous solution. While stirring the obtained hydrofluoric acid aqueous solution with a magnetic stirrer, 8 mL of a hydrogen peroxide solution (concentration: 30% by mass, manufactured by Kanto Chemical Co., Ltd.) was added dropwise. When the dropwise amount of the hydrogen peroxide solution exceeded a certain amount, yellow powder started to precipitate, and it was confirmed that the color of the solution in the beaker changed from purple.

[0058] Stir the solution for a while after the solution changes color, then stop stirring to allow the precipitated powder to settle. After the powder was precipita...

Embodiment 2～5

[0066] Phosphors were obtained in the same manner as in Example 1, except that the compounding ratio of each component, processing conditions, and drying conditions were changed as shown in Table 1.

[0067]

[0068]

[0069] For the phosphors prepared in Examples 1 to 5, surface composition analysis and quantum efficiency were evaluated by X-ray photoelectron spectroscopy as described later. In addition, the same evaluation was performed on KSF prepared in Example 1 before being treated with a solution containing a potassium-containing compound, a manganese reducing agent, and a silicon compound (hereinafter referred to as Comparative Example 1). The results are shown in Table 2.

[0070] [Surface Composition Analysis of Phosphor Surface by X-ray Photoelectron Spectroscopy]

[0071] Using an X-ray photoelectron spectrometer (manufactured by Thermo Fischer Scientific Inc., trade name: K-Alpha system), the ratio of elements present on the surface was measured for each of ...

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Abstract

One aspect of the present disclosure provides a method for producing a phosphor that contains K2SiF6:Mn4+, said method comprising a step wherein a fluoride phosphor is brought into contact with a solution that contains a compound containing potassium, a reducing agent and a silicon compound.

Description

technical field [0001] The present disclosure relates to a phosphor and a method of manufacturing the phosphor. Background technique [0002] Light emitting diodes (LEDs) are widely used in image display devices, backlights of displays, lighting, and the like. In image display devices using LEDs, LEDs having blue light emitting diodes and yellow phosphors are generally used. In recent years, there has been a need for higher color rendering in image display devices, and accordingly, green phosphors and red phosphors have been used in combination in place of yellow phosphors. Various red phosphors have been studied from the viewpoint of improving color rendering. [0003] In addition, excellent moisture resistance is required for image display devices using LEDs and the like. Therefore, phosphors used for LEDs are also required to have excellent moisture resistance. On the other hand, Mn known as a red phosphor 4+ Activated fluoride phosphors (such as K 2 SiF 6 :Mn 4+ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61
CPCC09K11/616C09K11/08C09K11/61C09K11/617
Inventor 市川真义
Owner DENKA CO LTD
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