Divalent europium-doped barium fluobromide light-emitting material, preparation method and applications thereof

A luminescent material, barium bromide fluoride technology, applied in luminescent materials, chemical instruments and methods, instruments, etc., can solve the problems of not particularly uniform appearance, large pollution of reduced carbon powder, affecting luminescent performance, etc., to achieve excellent fluorescence and Light-stimulated luminescent properties, high packing density, and uniform size distribution

Active Publication Date: 2020-01-17
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the BaFBr:Eu prepared by this method 2+ The morphology of the material is not particularly uniform enough, the particle size distribution is still wide, and the fluorescence intensity is very low; after the material is annealed at 200°C for 0.5h, a

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  • Divalent europium-doped barium fluobromide light-emitting material, preparation method and applications thereof
  • Divalent europium-doped barium fluobromide light-emitting material, preparation method and applications thereof
  • Divalent europium-doped barium fluobromide light-emitting material, preparation method and applications thereof

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[0044] Example 1

[0045] 1) Preparation of precursor material: weigh 89g BaBr 2 And 0.032g EuBr 2 Dissolved in a mixed solution of 2200 mL of ethanol and 200 mL of water (ethanol: water = 11:1), and magnetically stirred until completely dissolved to form solution A. Weigh 3.70gNH 4 F was dissolved in a mixed solution of 2200 mL ethanol and 200 mL water to form solution B. Under room temperature and magnetic stirring, solution B was slowly added to solution A for reaction. After solution B was added dropwise, the reaction was continued for 6 hours. Then centrifugal separation was performed at 1000 rpm / min to obtain the precipitate, and then washed with anhydrous ethanol and methanol in a cycle, and vacuum dried at 50° C. for 5 hours to obtain the precursor material. The scanning electron micrograph of the precursor material is as follows figure 1 As shown, it can be seen that the length of the particles is about 80 nm, the width is about 60 nm, and the thickness is about 30 nm. ...

Example Embodiment

[0048] Example 2

[0049] 1) Preparation of precursor material: weigh 89g BaBr 2 And 0.032g EuBr 2 Dissolved in a mixed solution of 2000 mL of ethanol and 400 mL of water (ethanol: water = 5:1), and magnetically stirred until completely dissolved to form solution A. Weigh 3.70gNH 4 F was dissolved in a mixed solution of 2000 mL ethanol and 400 mL water to form solution B. Under room temperature and magnetic stirring, solution B was slowly added to solution A for reaction. After solution B was added dropwise, the reaction was continued for 6 hours. Then centrifugal separation was performed at 1000 rpm / min to obtain the precipitate, which was washed with anhydrous ethanol and methanol in a cycle, and the precursor particles were vacuum dried at 50°C for 5 hours. The particle length is about 500nm, the width is about 400nm, and the thickness is about 50nm.

[0050] 2) Luminescent material BaFBr: Eu 2+ Preparation: Place the precursor material prepared in step 1) in an alumina crucib...

Example Embodiment

[0052] Example 3

[0053] 1) Preparation of precursor material: weigh 89g BaBr 2 And 0.032g EuBr 2 Dissolve in a mixed solution of 1600 mL of ethanol and 800 mL of water (ethanol: water = 2:1), and magnetically stir until completely dissolved to form solution A. Weigh 3.70gNH 4 F was dissolved in a mixed solution of 1600 mL ethanol and 800 mL water to form solution B. Under room temperature and magnetic stirring, solution B was slowly added to solution A for reaction. After solution B was added dropwise, the reaction was continued for 6 hours. Then centrifugal separation was performed at 1000 rpm / min to obtain the precipitate, which was washed with anhydrous ethanol and methanol in a cycle, and the precursor particles were vacuum dried at 50° C. for 5 hours. The particle length is about 1.5μm, the width is about 1.5μm, and the thickness is about 100nm.

[0054] 2) Luminescent material BaFBr: Eu 2+ Preparation: Place the precursor material prepared in step 1) in an alumina crucibl...

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Abstract

The invention discloses a divalent europium-doped barium fluobromide light-emitting material preparation method, which comprises: dissolving BaBr2 and EuBr2 in an ethanol aqueous solution to obtain asolution A; dissolving NH4F in an ethanol aqueous solution to obtain a solution B; adding the solution B into the solution A in a dropwise manner, carrying out a reaction for 5-8 h at a room temperature, washing, centrifuging, precipitating, and drying to obtain a precursor material; and carrying out annealing treatment to obtain the divalent europium-doped barium fluobromide light-emitting material. According to the invention, the light-emitting material is small in size, narrow in distribution range and regular and controllable in morphology, has excellent fluorescence and excellent opticalexcitation luminescence property, can be used for manufacturing imaging plates with high packing density to obtain imaging with high spatial resolution, and is widely applied to the fields of medicaldiagnosis, biological imaging, dosimeters and the like.

Description

technical field [0001] The invention relates to the field of X-ray storage phosphors. More specifically, it relates to a divalent europium-doped barium bromide fluoride luminescent material and its preparation method and application. Background technique [0002] X-rays were used in medical imaging almost immediately after their discovery by W.C. Roentgen in 1895. In the early days of medical imaging, traditional film was used for X-ray imaging. However, they are less sensitive to X-rays, and the total dose of X-rays that can be recorded is limited by the total number of silver halide grains. High-dose X-rays must be used in the process of medical imaging. For the benefit of the patient, X-ray doses need to be kept low. Inorganic phosphors are applied to X-ray intensifying screens. By using an intensifying screen coated with inorganic phosphors combined with traditional film, it has higher sensitivity than X-ray film, thereby reducing the radiation dose of X-rays. Howev...

Claims

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Application Information

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IPC IPC(8): C09K11/61G01T1/20B82Y40/00
CPCC09K11/7733G01T1/2012B82Y40/00
Inventor 胡秀杰陈龙孙承华符玉华张梅英周树云
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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