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Ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and preparation method thereof

A technology of afterglow gallate and luminescent material, applied in luminescent materials, chemical instruments and methods, etc., can solve the problem of limited afterglow performance of gallate magnetoplumbite, achieve excellent afterglow performance, simple preparation process, and easy technical popularization and the effect of industrial production

Active Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present inventors have applied for long afterglow of Cr3+ in gallate magnetoplumbite (a Cr3 +doped near-infrared long-lasting luminescent material and its preparation and application method, application number 201911074471.6), however, the magnetoplumbite matrix itself can provide limited defects, which leads to Cr3+ single Doped gallate magnetoplumbite has limited afterglow performance

Method used

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  • Ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and preparation method thereof
  • Ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and preparation method thereof
  • Ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and preparation method thereof

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Embodiment 1

[0036] According to the inorganic chemical formula La 0.99 MgGa 9.99 AlO 19 :0.01Cr 3+ ,0.01Yb 3+ The stoichiometric ratio, in turn weigh 2.304g of La 2 o 3 , 0.576g of MgO, 13.375g of Ga 2 o 3 , 0.728g Al 2 o 3 , 0.011g Cr 2 o 3 , 0.028g Yb 2 o 3 High-purity powder raw material, adding 2% by weight of H 3 BO 3 The powder was used as a co-solvent for the reaction, and all the powder raw materials were placed in an agate mortar. Add a small amount of alcohol and grind for 20 minutes. After the raw materials are fully mixed, transfer the mixture into an alumina ceramic crucible, transfer it to a high-temperature box furnace, raise the temperature to 1400 degrees at a heating rate of 5 degrees per minute, and keep it warm for 5 hours. Furnace cool to room temperature. The obtained block sample is fully ground into powder again to obtain a compound with chemical composition formula La 0.99 MgGa 9.99 AlO 19 :0.01Cr 3+ ,0.01Yb 3+ Near-infrared long afterglow lum...

Embodiment 2

[0040] According to the inorganic chemical formula La 0.98 ZnGa 9.495 al 1.5 o 19 :0.005Cr 3+ ,0.02Yb 3+ The stoichiometric ratio, in turn weigh 2.281g of La 2 o 3 , 0.203g ZnO, 12.712g Ga 2 o 3 , 1.092g Al 2 o 3 , 0.005g Cr 2 o 3 , 0.056g Yb 2 o 3 The high-purity powder raw materials were added with 1% by weight LiF as a reaction co-solvent, and all the powder raw materials were placed in an agate mortar. Add a small amount of alcohol and grind for 15 minutes. After the raw materials are fully mixed, transfer the mixture into an alumina ceramic crucible, transfer it to a high-temperature box furnace, raise the temperature to 1350 degrees at a heating rate of 5 degrees per minute, and keep it warm for 5 hours. Furnace cool to room temperature. The obtained block sample is fully ground into powder again to obtain a compound with chemical composition formula La 0.98 ZnGa 9.495 al 1.5 o 19 :0.005Cr 3+ ,0.02Yb 3+ Near-infrared long afterglow luminescent materi...

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Abstract

The invention discloses an ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and a preparation method thereof, belonging to the technical field of near-infrared luminescent materials. The chemical general formula of the material is La<1-y>AGa<11-x-z>Al O<19>: xCr<3+> and yYb<3+>, wherein A is one or two selected from the group consisting of elements with valence of +2, namely Zn and Mg; x is more than or equal to 0.0001 and less than or equal to 1; y is more than or equal to 0.0001 and less than or equal to 1; and z is more than or equal to 0 and less than or equal to 5. Yb<3+> is used as an electron trap, a new thermoluminescence peak appears in a range of 50-150 DEG C after Yb<3+> is added, afterglow intensity and afterglow time are remarkably improved, and Cr<3+> is used as a luminescence center. The near-infrared ultra-long-afterglow luminescent material is of a hexagonal structure and has a space crystal structure which is the same as the space crystal structure of LaMgGa<11>O<19>, and the space group of the material is P63 / mmc. The excitation wavelength range of the material is 250-700 nm, and the emission wavelength range of the material is 600-1100 nm; the material has ultra-long afterglow decay time of 10 hours or more after being irradiated by ultraviolet light for 5 minutes, and the afterglow performance of the material is superior to the afterglow performance of a current commercial ZnGa<2>O<4>: Cr<3+> near-infrared long-afterglow luminescent material. Experiments show that the material has wide application prospects in the aspects of counterfeiting prevention, military affairs, biological imaging, optical information storage and the like. The material is simple to prepare, can be formed by one-time sintering and is easy to technically popularize.

Description

technical field [0001] The present invention relates to a kind of containing Yb 3+ A near-infrared ultra-long afterglow luminescent material and a preparation method thereof belong to the technical field of near-infrared luminescent materials. Background technique [0002] Long afterglow luminescent material is a kind of light storage material. Under the condition of external light stimulation, the material can still release photons slowly even after the excitation light source is removed. In recent years, long-lasting luminescent materials have achieved vigorous development in biological imaging, optical information storage, and marker tracking. At present, long afterglow materials are mainly concentrated in the visible light part, such as green SrAl 2 o 4 :Eu 2 + , Dy 3+ , blue CaAl 2 o 4 :Eu 2+ ,Nd 3+ , Orange Sr 3 SiO 5 :Eu 2+ ,Nd 5+ , red Y 2 o 2 S:Eu 3+ ,Mg 2+ , Ti 4+ , however, long-lasting materials in the near-infrared band are relatively scarce. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7776
Inventor 刘泉林刘胜强宋振
Owner UNIV OF SCI & TECH BEIJING
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