Chromium-doped red fluorescent powder and preparation method thereof

Abstract

The invention discloses chromium-doped red fluorescent powder and a preparation method thereof. The fluorescent powder comprises a zinc gallate substrate and an optical active component Cr<3+>, and the chemical formula of the fluorescent powder is ZnGa2O4:xCr<3+>, wherein the x is greater than 0.01 and smaller than 0.6, the excitation peak of the fluorescent powder is 590 nm, and the emission peak of the fluorescent powder is 710 nm. The fluorescent powder is prepared through the following steps: (1) accurately weighing oxides of Zn, Ga and Cr or corresponding salts according to the chemical formula; (2) mixing the raw materials after weighing, and sintering for 1-5 hours at the temperature of 900-1200 DEG C; (3) grinding products obtained after sintering, and enabling the ground products to pass through a mesh sieve, so as to obtain the red fluorescent powder. According to the invention, relatively cheap metallic elements are used for replacing expensive rare-earth elements to prepare the relatively cheap inorganic fluorescent powder; the fluorescent powder can shine in a dark red area that the light wavelength of the common rare earth doped fluorescent powder cannot reach.

Description

technical field [0001] The invention relates to the field of fluorescent powder, in particular to a chromium (III)-doped red fluorescent powder and a preparation method thereof. Background technique [0002] Inorganic phosphors are mostly compounds doped with rare earth elements, and these doped rare earth elements act as photoactive centers to cause fluorescence. Inorganic phosphors that emit red light are mostly compounds doped with rare earths such as Eu(III) or Sm(III). Due to the lack of rare earth resources, such phosphors are more expensive. In addition, the wavelength of the light-emitting region of the compound doped with rare earth elements is mostly in the red light region less than 660nm, and it is difficult to reach the deep red region with a wavelength of more than 700nm. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a red fluorescent powder doped with chromium (III) with low cost and good applic...

AI Technical Summary

Problems solved by technology

Inorganic phosphors that emit red light are mostly compounds doped with rare earths such as Eu(III) or Sm(III). Due to the lack of rare earth resources, such phosphors are more expensive.

In addition, the light-emitting region wavelength of the compound doped with rare earth elements is mostly in the red light region less than 660nm, and it is difficult to reach the deep red region with a wavelength above 700nm.

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