A tetravalent manganese ion-doped ammonium salt red light material and preparation method thereof

Abstract

The invention discloses a tetravalent manganese ion doped ammonium salt red light material and a preparation method thereof. (NH4)2TiF6 is taken as the matrix, Mn<4+> is taken as the activator, and the chemical formula of the red light material is (NH4)2TiF6:Mn<4+>. The red light material is prepared by the following steps: placing a (NH4)2TiF6 solid in a container, sequentially dropwise adding a KMnO4 water solution and an HF water solution, adding deionized water, carrying out reactions for 1 to 12 hours under stirring at a room temperature, carrying out suction filtration, and naturally drying. The maximal excitation wavelength of the red light material is in the 467 nm blue light area, the red light material can be excited by a GaN blue light chip and emits a red tetravalent manganese characteristic emission peak, the emission spectrum is in a range of 600 to 650 nm; the material can supply red lights to white light LED so as to increase the color rendering index of white light LED; the material does not contain any rare earth, no high temperature sintering is needed in the preparation method , and the method is suitable for 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; in particular to an ammonium fluorotitanate luminescent material with an excitation wavelength in the blue light region and an emission wavelength in the red light region and a preparation method thereof. Background technique [0002] White light LED is increasingly favored by people because of its remarkable energy-saving effect. Recently, the leading product in the white LED market is a two-color white LED packaged by yellow phosphor YAG:Ce and blue LED. Due to the lack of red light components in the spectrum of this type of white light LED, the color temperature is high and the color rendering index is low. , unable to meet the indoor lighting requirements. [0003] The red light component that can also be excited by the blue light chip is mixed into the yellow phosphor YAG:Ce, which can effectively improve the colo...

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Problems solved by technology

[0005] Another type of tetravalent manganese-doped red light material is emerging. Japanese scholar Adachia synthesized the red light material K 2 SiF 6 :Mn 4+ with Na 2 GeF 6 :Mn 4+ [S. Adachia, T. Takaha, "Direct synthesis and properties of K 2 SiF 6 :Mn 4+ phosphor by wet chemical etching of Si wafer", J.Appl.Phys.104(2008)023512; Y.K.Xu, S.Adachia, "Properties of Na 2 SiF 6 :Mn 4+ andNa 2 GeF 6 :Mn 4 +red phosphors synthesized by wet chemical etching", J.Appl.Phys.105(2009)013525.], in this method, K is synthesized 2 SiF 6 :Mn 4+ with a large amount of by-product MnO 2 , it is bound to pollute the target product, and the product is light yellow, which affects the luminescence performance of the material, and the synthesis of Na in this method 2 GeF 6 :Mn 4+ The raw material Ge used is extremely expensive, and the concentration of the etching solution used is high, making it difficult to achieve large-scale production

Researcher Chen Xueyuan, a domestic scholar, used the anion exchange method to efficiently synthesize the red light material K at room temperature. 2 TiF 6 :Mn 4+ [H.M.Zhu, C.C.Lin, W.Q.Luo, S.T.Shu, Z.G.Liu, Y.S.Liu, J.T.Kong, E.Ma, Y.G.Cao, R.S.Liu, X.Y.Chen,"Highly efficient non‐rare‐earth red emitting phosphor for warm white light ‐emitting diodes", Nat.Commun.5(2014) 4312.], its quantum efficiency is as high as 98%, but the raw material K is used in the synthesis process 2 MnF 6 , no commercial sales, its preparation process is complicated, and organic raw materials such as acetone are needed, which will inevitably limit large-scale industrial production

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