Cr < 3 + > doped phosphate broadband near-infrared fluorescent powder and preparation method thereof

Through the development and preparation of Cr3+ doped phosphate broadband near-infrared phosphor, the problems of low luminous efficiency and difficulty in being efficiently excited by blue LED chips in the prior art are solved, and efficient and stable broadband near-infrared emission and reduced preparation costs are achieved.

CN120041198APending Publication Date: 2025-05-27ANQING NORMAL UNIV
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Patent Information

Application Number
CN202510211486.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2025-05-27

AI Technical Summary

Technical Problem

The existing near-infrared phosphor has low luminous efficiency, difficult to cover the wide near-infrared band, and difficult to be efficiently excited by blue-light LED chips. The preparation process is complex and costly.

Method used

A broadband near-red intrafluorescent phosphor with Cr3+ doped phosphate was developed, with the general chemical formula of M2-yAl1-x-yTi1+y(PO4)3:xCr3+, and was prepared by high-temperature presintering and sintering treatment under high temperature conditions to form a phosphor with a hexagonal crystal structure.

Benefits of technology

It realizes broadband near-infrared emission of 700nm to 1300nm under blue light excitation with wavelengths of 450nm to 500nm, with high luminous efficiency and stability, and can match well with commercial blue light LED chips, reducing the production cost.

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Abstract

The invention discloses a Cr < 3 + > doped phosphate broadband near-infrared fluorescent powder and a preparation method thereof, and relates to the technical field of luminescent materials, the crystal structure of a matrix lattice of the near-infrared fluorescent powder belongs to a hexagonal system, the space group is R-3c (167), the chemical general formula is M < 2-y > Al < 1-x-y > Ti < 1 + y > (PO4) 3: xCr < 3 + >, M is at least one of L , Na and K, x and y are mole fractions and 0 lt respectively, and x is 0 lt. 0 < = y < = 1; the preparation method comprises the following steps: respectively weighing compounds containing elements according to the stoichiometric ratio, uniformly mixing, roasting in a high-temperature box-type furnace, and grinding after the product is cooled to obtain the near-infrared fluorescent powder. The near-infrared fluorescent powder prepared by the invention has excellent luminescence property and stability, wide emission wavelength coverage range and good application prospect, can be effectively excited by a blue light LED chip, realizes broadband near-infrared emission of 700nm-1300nm, can be used as a light conversion material of the blue light LED chip, and is simple in preparation process and stable and reliable in product quality.
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Claims

1. A Cr 3+ A phosphate-doped broadband near-infrared phosphor, characterized in that: The chemical formula of the near-infrared phosphor is M 2-y Al 1-x-y Ti 1+y (PO4)3:xCr 3+ , where M is at least one of Li, Na, and K, and x and y are molar fractions respectively. <x≤0.2,0≤y≤1。 2. A Cr according to claim 2 3+ A phosphate-doped broadband near-infrared phosphor, characterized in that: The crystal structure of the matrix lattice of the near-infrared phosphor belongs to the hexagonal system, and the space group is R-3c (167).

3. A Cr according to claim 3 3+ A phosphate-doped broadband near-infrared phosphor, characterized in that: The near-infrared phosphor can achieve broadband near-infrared emission of 700nm to 1300nm under the excitation of blue light with a wavelength of 450nm to 500nm, and its main emission peak is in the range of 755nm to 935nm.

4. A Cr 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that , the preparation method comprises the following steps: S1. According to chemical formula M 2-y Al 1-x-y Ti 1+y (PO4)3:xCr 3+ Weigh the compounds containing each element according to the stoichiometric ratio, where M is at least one of Li, Na, and K, x and y are mole fractions and 0 < x ≤ 0.2, 0 ≤ y ≤ 1, and then mix the compounds evenly and grind them thoroughly to obtain a mixture; S2, placing the mixture prepared in S1 in a high temperature box furnace for high temperature pre-sintering treatment, and obtaining a pre-sintered body after cooling; S3, after fully grinding the pre-sintered body obtained in S2, placing it in a high-temperature box-type furnace for high-temperature sintering treatment, and obtaining a sintered body after cooling; S4. Grind the sintered body obtained in S3 to obtain near-infrared phosphor.

5. A Cr according to claim 4 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that: The compound containing M in the S1 is at least one of an oxide of M and a carbonate of M, the compound containing Al is at least one of an oxide of Al and a nitrate of Al, the compound containing Ti is at least one of an oxide of Ti and a nitrate of Ti, the compound containing P is at least one of an oxide of P and a phosphate of P, and the compound containing Cr is at least one of an oxide of Cr and a nitrate of Cr.

6. A Cr according to claim 4 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that: The temperature of the high temperature pre-sintering treatment in S2 is set to 400° C. to 600° C., the time is set to 4 to 6 hours, the heating rate is set to 3 to 5° C. / min, and the heating atmosphere is air atmosphere.

7. A Cr according to claim 4 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that: The temperature of the high temperature sintering treatment in S3 is set to 800° C. to 1000° C., the time is set to 4 to 8 hours, the heating rate is set to 3 to 5° C. / min, and the heating atmosphere is air atmosphere.

8. A Cr according to claim 4 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that: The grinding time in S3 is set to 15 to 30 minutes; the grinding time in S4 is set to 15 to 30 minutes.

9. A Cr according to claim 5 3+ A method for preparing a phosphate-doped broadband near-infrared phosphor, characterized in that: The compound containing M is a carbonate of M, and M is at least one of Li, Na, and K; the compound containing Al is an oxide of Al; the compound containing Ti is an oxide of Ti; the compound containing P is a phosphate of P; and the compound containing Cr is an oxide of Cr.