Mn<4+> doped fluoride red light fluorescent powder for high color rendering and warm white light LED (Light Emitting Diode) and preparation method of Mn<4+> doped fluoride red light fluorescent powder

Abstract

The invention discloses Mn<4+> doped fluoride red light fluorescent powder for a high color rendering and warm white light LED (Light Emitting Diode) and a preparation method of the Mn<4+> doped fluoride red light fluorescent powder. The chemical composition of a fluorescent powder material is Rb2AF6:xMn<4+>, wherein A is Zr or Ti, x is the mol percentage coefficient of Mn<4+> doped ions relative to the A, and the x is greater than or equal to 1.25 percent and smaller than or equal to 20 percent. The fluorescent powder material has the effects of broadband absorption and narrowband emission, and can be used for packaging a high-quality LED. The preparation method comprises the following steps: at room temperature, adding K2MnF6 powder into water, and stirring until the power is completely dissolved; then adding RbF powder and H2AF6 aqueous solution, continuously stirring until the substances are dissolved, centrifuging, washing and drying to obtain an orange-yellow sediment, namely the Mn<4+> doped fluoride red light fluorescent powder for the high color rendering and warm white light LED. The preparation method disclosed by the invention has the advantages of simplicity and convenience in operation, greenness, environment friendliness, mild reaction conditions, high efficiency, quickness and suitability for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of white light LED phosphor preparation, in particular to a Mn 4+ Doped high color rendering LED fluoride red fluorescent material and preparation method thereof. Background technique [0002] White light diodes (WLEDs) are widely used in transportation, medical equipment, military, display screens and daily life due to their energy saving, environmental protection and long service life. At present, commercial white LEDs are mainly realized by the combination of blue GaN chips (440-480nm) and YAG:Ce. This synthesis method is relatively simple and mature, but due to the lack of red components, the color temperature is high (CCT>4500K), and the color rendering index is relatively high. Lower (Ra﹤80). In order to further improve LED light efficiency, it is often necessary to add some red phosphors, such as MASiN 3 :Eu 2+ (M=Ca, Sr) and the like. Rare earth elements have rich electronic energy level tran...

AI Technical Summary

Problems solved by technology

However, the synthesis of this type of fluoride phosphor is often obtained by dissolving the raw materials in high-concentration hydrofluoric acid, and volatilizing and co-crystallizing to obtain the target product. During the synthesis process, a large amount of toxic gas HF will be generated, the preparation process is difficult to control, and it is not suitable for industrialization. Production

And use a certain low concentration of hydrofluoric acid as a solvent to synthesize the target product through hydrothermal reaction at high temperature (120-180°C). Compared with the previous synthesis method, the amount of hydrofluoric acid used in this method is reduced, but The yield and luminous efficiency of phosphors are low, which is still not conducive to industrial mass production

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