Preparation methods of fluorosilicate red fluorescent powder and composition containing fluorescent powder, products and applications

Abstract

The invention provides a preparation method of fluorosilicate red fluorescent powder. The red fluorescent powder is shown by a general formula I: M2SiF6: Mn<4+> (I), wherein M is selected from one or two of K and Na. The preparation method of the fluorosilicate red fluorescent powder comprises the following steps: (1) adding MMnO4 and MF into hydrofluoric acid, carrying out stirring until the aforementioned three materials are uniformly mixed, and dropwise adding H2O2 into the mixture until the color of the solution is changed to obtain mixed liquor; (2) adding a powdery substance containing silicon oxide into the mixed liquor, heating the liquor with the substance at first for full reaction, then carrying out cooling to separate out a crystal, and carrying out filtration to obtain a yellow solid; and (3) washing the yellow solid obtained in the step (2) by separately using a small amount of pure water and an organic solvent, and carrying out drying treatment to obtain the red fluorescent powder. The invention also provides a preparation method of a composition containing the fluorescent powder, the red fluorescent powder or the composition containing the fluorescent powder prepared by using the method, and applications of the fluorescent powder or the composition containing the fluorescent powder in LED (Light-Emitting Diode) illumination or backlight elements or equipment.

Description

technical field [0001] The present invention relates to a preparation method of fluorescent powder, in particular to a preparation method of fluorosilicate red fluorescent powder, a preparation method of a composition containing the red fluorescent powder, and the red fluorescent powder prepared by the above preparation method or containing The composition of the red phosphor, and the use of the red phosphor or the composition containing it in LED lighting or LED backlight components or equipment. Background technique [0002] A light-emitting diode (Light-Emitting Diode, referred to as LED) is a semiconductor electronic component that converts electrical energy into light energy. This kind of electronic component appeared as early as 1962. In the early days, it could only emit low-level red light, and later developed other versions of monochromatic light. Today, the light that can be emitted has covered visible light, infrared rays, and ultraviolet rays, and the breadth has...

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Problems solved by technology

However, this kind of phosphor needs to be doped with rare earth, and the raw material requirements are relatively special. It usually needs to be prepared under high temperature and high pressure, and the preparation conditions are harsh.

Not only high energy consumption, but also low yield, so its production cost is high and the price is very expensive

Other current methods of preparing phosphors, such as hydrothermal method, microwave method, high-temperature solid-phase method, etc., are still complicated in production process, and the requirements for equipment are still high

In addition, since the absorption peak of the light conversion material of the blue LED is required to be located at 420-470nm, there are very few fluorescent materials that meet this requirement and the absorption intensity is low

The research of this kind of phosphor materials is relatively difficult, and there are not many varieties of phosphors that can be excited by blue light and emit visible light.

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