Self-activated titanoniobate-based fluorescent powder and preparation method thereof

Abstract

The invention discloses a self-activated titanoniobate-based fluorescent material and a preparation method thereof. The series of fluorescent powder is prepared by the following steps: taking GdNbTiO6 as a matrix, doping rare earth ions Eu3<+> and Dy<3+>, thereby obtaining a red fluorescent material Gd<1-x>NbTiO6:xEu3<+> and yellow green fluorescent powder Gd<1-y>NbTiO6:yDy3<+>, wherein x is equal to 0.01-0.05, and y is equal to 0.01-0.05. The process flow disclosed by the invention is safe, simple and easy to control. The prepared fluorescent material has the advantages of high chemical stability, non-toxicity, zero radiation, high brightness, high color purity, high conversion efficiency and the like.

Description

technical field [0001] The invention relates to the field of rare earth luminescent materials, in particular to a red or yellow-green self-activated niobium titanate-based fluorescent material which can be applied to trichromatic fluorescent lamps and a preparation method thereof. Background technique [0002] Most of the current commercial light sources need to use phosphors for light conversion. Fluorescent lamps made of rare earth tricolor phosphors are very efficient and energy-saving new light sources. They are the key development direction of the world's lighting sources. There is a huge demand for primary color phosphors, and the supply is basically in short supply. Because the rare earth three-color fluorescent lamp has the characteristics of high luminous efficiency, low light decay and long life, it has been widely recognized and developed rapidly in the current environment where energy conservation and emission reduction are vigorously advocated. The research, dev...

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Problems solved by technology

[0004] In recent years, many units at home and abroad have devoted themselves to the research of finding a matrix suitable for rare earth doping, and the exploration of phosphors based on rare earth niobium titanate is also ongoing, and a series of rare earth niobium titanates that can be used in different fields have been prepared. Titanate phosphor (LaNbTiO 6 :Eu 3+ , YNbTiO 6 :Eu 3+ / Dy 3+ ), but compared with the current commercial phosphors, this series of phosphors still has some defects, such as low luminous efficiency, large light attenuation, impure chromaticity, etc.

In recent years, a large number of researchers have only studied the GdNbTiO 6 The microwave dielectric properties of these materials have been investigated in detail, but their optical properties have not been reported.

In addition, those skilled in the art also believe that Gd, La, and Y are both rare earth elements, have similar chemical properties, and have certain similarities in luminescence performance, and some electron-hole pairs formed due to excitation may be absorbed by Gd. 3+ Trapped, the excitation energy is at Gd 3+ Therefore, those skilled in the art will think that this situation will reduce the luminous efficiency of phosphor powder (see literature 1 K. Mori, M. Nakayama and H. Nishimura, Role of the core excitons formed by 4f-4f transitions of Gd 3+ on Ce 3+ scintillation in Gd 2 SiO 5 : Ce 3+ ,Physical Review B,2003,67

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