Red germanate long-afterglow luminescent material and preparation method thereof

Abstract

The invention belongs to the technical field of luminescent materials, and discloses a red germanate long-afterglow luminescent material and a preparation method thereof. The method comprises the steps: according to the stoichiometric ratio of the chemical composition of Mg[2-y-z]Ge[1-x]O[4]:xMn<4+>,yYb<3+>,zLn<3+>, (x=0.001-0.20, y=0.005-0.10, and z=0-0.10), weighing MgO, GeO2, MnO2, Yb2O3 and Ln2O3, grinding uniformly, then in an oxidizing or inert atmosphere, sintering at high temperature, and cooling to obtain the red germanate long-afterglow luminescent material. The long-afterglow luminescent material does not contain sulfur, and has the advantages of good physical and chemical stability, cheap and easily obtained raw materials, and low cost; at the same time, compared with an Eu<2+> activated broadband-emission red long-afterglow luminescent material, the long-afterglow luminescent material provided by the invention has purer luminescent color, and has the emitted light closer to standard red light.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, relates to the field of long afterglow luminescent materials, in particular to a germanate red long afterglow luminescent material and a preparation method thereof. Background technique [0002] Long afterglow luminescent materials, also known as luminous materials, can absorb external light energy and store it, and release it slowly in the form of visible or near-infrared light after the excitation light source stops exciting. This feature makes the long afterglow luminescent materials widely used in various industries such as various signs and instructions in dark environments, luminescent inks, luminescent ceramics, luminescent optical fibers, textiles and decorative materials. In recent years, it has gradually expanded to information storage, biological imaging in vitro and in vivo, high-energy ray detection and other fields. Existing visible light long-lasting luminescent mate...

AI Technical Summary

Problems solved by technology

However, such materials have poor chemical temperature stability, are prone to deliquescence and ultraviolet photolysis, and require complex post-processing processes to coat the product.

(La,Y,Gd) 2 o 2 S:Eu 3+ It is another kind of red long afterglow luminescent material. The luminous brightness of the afterglow has reached the practical requirements, and the afterglow time is as long as 8 hours. However, the preparation process of this long afterglow material is complicated, the cost of raw materials is high, and the production process will produce toxic gases. SO 2 , which hinders its further application

For this reason, some sulfur-free red long-lasting fluorescent materials such as CaTiO 3 :Pr 3+ , MgSiO 3 :Mn 2+ , Eu 2+ , Dy 3+ , CdSiO 3 :Sm 3+ , Y 2 o 3 :Eu 3+ , BaZrO 3 :Eu 3+, Ti 4+ 、Sr 3 Al 2 o 6 :Eu 2+ , Dy 3+ The preparation process of these substances is relatively simple, and the physical and chemical properties of the matrix materials are stable, but the disadvantage is that the luminous brightness and afterglow time of these substances cannot meet the practical requirements.

Images