Mn<4+>-doped sodium bifluoride red light material and method for preparing same

Abstract

The invention discloses a Mn<4+>-doped sodium bifluoride red light material and a method for preparing the same. Chemical composition of the Mn<4+>-doped sodium bifluoride red light material is NaHF<2>:Mn<4+>. The Mn<4+>-doped sodium bifluoride red light material is made of raw materials including 15-30 mL of HF (with the concentration of wt 40%), 1*10<-4>-9*10<-4> mol of K<2>MnF<6> solid and 0.01-0.1 mol of NaF. The method includes adding the raw materials into deionized water to obtain liquid with the total volume of 40 mL; carrying out stirring reaction on the liquid at the normal temperature for 0.5-2 hours; carrying out suction filtration on reaction products; naturally drying the reaction products at the normal temperature to obtain white powder. The Mn<4+>-doped sodium bifluoride red light material and the method have the advantages that bright red light can be emitted by the Mn<4+>-doped sodium bifluoride red light material under ultraviolet lamps, the maximum excitation bands of the Mn<4+>-doped sodium bifluoride red light material can be completely matched with spectra of blue light emitted by blue light chips of white light LEDs, and an emission spectrum of the Mn<4+>-doped sodium bifluoride red light material comprises seven red light emission peaks positioned at four locations of 595-643 nm; the Mn<4+>-doped sodium bifluoride red light material can be possibly applied to a white light LED with two fundamental colors, so that color rendering indexes of the white light LED can be increased; the Mn<4+>-doped sodium bifluoride red light material does not contain rare earth, the method is simple, and accordingly the Mn<4+>-doped sodium bifluoride red light material and the method are applicable to industrial production.

Description

technical field [0001] The present invention relates to a luminescent material, in particular to a red light material which can be used in a white light LED and a preparation method thereof; in particular to a Mn material with an excitation wavelength in the blue light region and an emission wavelength in the red light region 4+ Doped hydrogen fluoride nanoluminescent material and its preparation method. Background technique [0002] White light LED is the fourth generation of light source after incandescent lamp and fluorescent lamp, and is recognized as a new light source in the 21st century. Because of its advantages of high efficiency, energy saving, environmental protection, long life and small size, it is widely used in various fields such as lighting, communication and display. It not only provides a perfect backlight solution for manufacturers, but also provides economical and high-quality light sources for general lighting. Today's market-leading white LED products...

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Problems solved by technology

Japanese researchers synthesized a series of Mn 4+ Doped composite fluoride red light material and study its luminescent properties, but the synthesis method is more complicated, and the raw materials used are expensive (pure metal), and the concentration of the etching solution used is very high (40% HF aqueous solution), KMnO 4 High concentration (prone to non-luminescent by-products, such as MnO 2 )[S.Adachi,T.Takahashi,"A yellow phosphor K 2 SiF 6 activated by Mn 2+ ion", J.Appl.Phys.108(2010) 063506; R.Kasa, S.Adachi,"Mn‐activated K 2 ZrF 6 andNa 2 ZrF 6 Phosphors: Sharp red and oscillatory blue‐green emissions", J.Appl.Phys.112(2012) 013506.; S.Adachi, T.Takahashi, "Photoluminescence and Raman scattering spectroscopies of Ba SiF 6 :Mn 4+ red phosphor”, J.Appl.Phys.106(2009)013516.]

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