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Novel neodymium-doped near-infrared fluorescent material and preparation method thereof

A fluorescent material and near-infrared technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of poor energy transfer efficiency, low solubility, low luminous intensity, etc., and achieve regular shape, good dispersion, and flexible process Effect

Inactive Publication Date: 2014-11-05
重庆领先新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there have always been two important problems in the research of near-infrared luminescent materials doped with rare earth ions: the microscopic shape of the material is not easy to control and the luminous intensity is not high, which limits its practical application.
[0003] The microscopic morphology of inorganic materials is generally determined by its preparation process. The hydrothermal synthesis method refers to the synthesis of substances in the solution under certain temperature and pressure conditions. The preparation conditions are mild, and the obtained particles have a small particle size. The appearance is regular, and the sample purity is high, but it is determined by the reactivity of the substance under the synthesis conditions, the synthesis rule, and the structure and properties of the synthesis product. It requires good dispersion of the raw material in the solvent, and the solubility of the product in the solvent is extremely low.
The reason why the near-infrared luminous intensity is not high is because: the energy transfer efficiency of the inorganic near-infrared luminescent material to Er or Nd is very poor, and the light absorption efficiency of rare earth ions is low

Method used

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  • Novel neodymium-doped near-infrared fluorescent material and preparation method thereof
  • Novel neodymium-doped near-infrared fluorescent material and preparation method thereof
  • Novel neodymium-doped near-infrared fluorescent material and preparation method thereof

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Embodiment 1

[0024] Put 12g of NaY-type zeolite and 1g of neodymium nitrate into 200ml of deionized water, stir with a magnetic stirrer for 24h, keep at 500°C for 3 hours, put it into a cylindrical mold with a diameter of 40mm, heat it to 900°C, and simultaneously. After pressurizing 20MPa, keeping the heat and pressure for 2 hours, and cooling with the furnace to room temperature, a neodymium-doped near-infrared fluorescent material with a thickness of about 3mm can be obtained. Its emission spectrum is as Figure 4 Shown in line 1 in the middle, its fluorescence lifetime is 312 μs.

Embodiment 2

[0026] Put 12g of NaY-type zeolite and 2g of neodymium nitrate into 200ml of deionized water, stir with a magnetic stirrer for 24h, keep at 500°C for 3 hours, put it into a cylindrical mold with a diameter of 10mm, and apply 1GPa cold pressing to obtain a thickness of about 2mm semi-finished product. The semi-finished product is heated to 1000° C., kept for 6 hours, and then cooled to room temperature with the furnace to obtain the neodymium-doped near-infrared fluorescent material. Its emission spectrum is as Figure 4 As shown in line 2 in the middle, its fluorescence lifetime is 403 μs.

Embodiment 3

[0028] Put 12g of 4A-type zeolite and 1g of neodymium nitrate into 200ml of deionized water, stir with a magnetic stirrer for 24h, keep at 500°C for 3 hours, put it into a cylindrical mold with a diameter of 40mm, heat it to 1000°C, and at the same time. After pressurizing 40MPa, keeping the heat and pressure for 2 hours, and cooling with the furnace to room temperature, a neodymium-doped near-infrared fluorescent material with a thickness of about 3mm can be obtained. Its emission spectrum is as Figure 4 Shown in line 3 in the middle, its fluorescence lifetime is 356 μs.

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Abstract

The invention discloses a novel neodymium-doped near-infrared fluorescent material and a preparation method thereof. The material is mainly characterized in that the composition is X1SiO2-2Al2O3-3Na2O-4Nd2O3 (X1=20-30%, X2=5-10%, X3=2-5%, and X4=1-10%); and the preparation method of the material comprises: (1) uniformly mixing zeolite and neodymium nitrate, heating to 500-600 DEG C, and keeping warm for 2-5 h, so as to obtain a neodymium-doped zeolite precursor; (2) performing hot-pressing forming on the neodymium-doped zeolite precursor, controlling the pressure intensity to be 10 MPa-3 GPa and the heating temperature to be 700 DEG C-1200 DEG C, and keeping the high temperature for 1 hour or more; and (3) naturally cooling in the furnace. The rare-earth fluorescent material with stable physical and chemical properties, which is obtained by using the method, is characterized in that fluorescence is generated at 1064 nm when 582 nm yellow light is employed for exciting the glass, the transmission scope is 300-400 mu s, and the material is widely applicable to fields such as substance analysis, infrared detection, optical communication and the like.

Description

technical field [0001] The invention relates to a novel neodymium-doped near-infrared fluorescent material and a preparation method thereof, belonging to the field of rare earth near-infrared fluorescent material synthesis. Background technique [0002] Near infrared refers to electromagnetic waves in the wavelength range of 780-2520nm. Er-doped 3+ , Nd 3+ , Tm 3+ Near-infrared luminescent materials such as rare earth ions, due to their special properties such as stable characteristic emission peak wavelength, sharp peak shape and good photostability, they have been used in military reconnaissance, material analysis, medical equipment, non-destructive testing and other fields in recent years. Application value increasingly prominent. However, there have been two important problems in the research of near-infrared light-emitting materials doped with rare earth ions—the microscopic morphology of the material is not easy to control and the luminous intensity is not high, wh...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 周忠福宋甫乔治·奈威尔·格瑞夫斯王清露
Owner 重庆领先新材料有限公司