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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, although the fluorescence performance of the material has improved, the operation is complicated and the pollution of reduced carbon powder is large , and the luminescent center Eu 2+ easily oxidized to Eu 3+ , thus affecting its luminescent properties

Method used

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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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Embodiment 1

[0045] 1) Preparation of precursor material: weigh 89g BaBr 2 and 0.032g EuBr 2 Dissolve in a mixed solution of 2200mL ethanol and 200mL water (ethanol:water=11:1), and stir until completely dissolved to form solution A. Weigh 3.70gNH 4 F was dissolved in a mixed solution of 2200mL ethanol and 200mL water to form solution B. At room temperature and under magnetic stirring, the solution B was slowly added to the solution A for reaction. After the solution B was added dropwise, the reaction was continued for 6 hours. Then centrifuge at 1000rpm / min to obtain a precipitate, then cycle wash with absolute ethanol and methanol, and vacuum dry at 50°C for 5h to obtain the precursor material. The scanning electron microscope image of the precursor material is shown in figure 1 As shown, it can be seen that the particle length is about 80nm, the width is about 60nm, and the thickness is about 30nm.

[0046] 2) Luminescent material BaFBr:Eu 2+ Preparation: the precursor material pr...

Embodiment 2

[0049] 1) Preparation of precursor material: weigh 89g BaBr 2 and 0.032g EuBr 2 Dissolve in a mixed solution of 2000mL ethanol and 400mL water (ethanol:water=5:1), and stir until completely dissolved to form solution A. Weigh 3.70gNH 4 F was dissolved in a mixed solution of 2000mL ethanol and 400mL water to form solution B. At room temperature and under magnetic stirring, the solution B was slowly added to the solution A for reaction. After the solution B was added dropwise, the reaction was continued for 6 hours. Then centrifuge at 1000rpm / min to obtain precipitates, then cycle wash with absolute ethanol and methanol, and vacuum dry at 50°C for 5h to form the precursor particles. 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: the precursor material prepared in step 1) was placed in an alumina crucible, and then placed in a tube furnace for annealing at 600° C. for 2 ...

Embodiment 3

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

[0054] 2) Luminescent material BaFBr:Eu 2+ Preparation: the precursor material prepared in step 1) was placed in an alumina crucible, and then placed in a tube furnace for annealing at 600° C. fo...

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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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