Near-infrared fluorescent powder and preparation method thereof

A fluorescent powder and near-infrared technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor anti-interference, indifference, and low sensitivity, and achieve good stability, high luminous intensity, and high safety.

Active Publication Date: 2017-09-01
HEBEI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the mid-to-late 1960s, with the emergence of various new analysis techniques, coupled with the weaknesses of low sensitivity and poor anti-interference exposed by the classic near-infrared spectroscopy analysis technique, people became indifferent to the application of this technique in analysis and testing. , the near-infrared spectrum entered a period of silence

Method used

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  • Near-infrared fluorescent powder and preparation method thereof
  • Near-infrared fluorescent powder and preparation method thereof
  • Near-infrared fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh each raw material according to the following weight: Weigh calcium carbonate (CaCO 3 ) 1.0009g, gallium oxide (Ga 2 o 3 ) 0.6092g, chromium trioxide (Cr 2 o 3 ) 0.0127g and germanium oxide (Ge 2 o 3 ) 1.3952g, mixed evenly, placed in an agate mortar and fully ground for 30min to obtain the mixture;

[0024] (2) Put the ground mixture powder in a small crucible, heat up to 1200°C at a heating rate of 5°C / min, sinter at this temperature for 4 hours, and cool naturally to room temperature to obtain a sintered body;

[0025] (3) Cool the obtained sintered body to room temperature and grind it thoroughly to obtain the chemical formula Ca 3 Ga 1.95 Cr 0.05 Ge 4 o 14 near-infrared phosphors.

[0026] Based on the near-infrared fluorescent powder prepared in this example, its intensity and wavelength are adjusted at an emission wavelength of 745 nm.

Embodiment 2

[0028] (1) Weigh each raw material according to the following weight: Weigh calcium carbonate (CaCO 3 ) 1.0009g, gallium oxide (Ga 2 o 3 ) 0.5467g, indium oxide (In 2 o 3 ) 0.0925g, chromium trioxide (Cr 2 o 3 ) 0.0127g and germanium oxide (Ge 2 o 3 ) 1.3952g, mixed evenly, placed in an agate mortar and fully ground for 30min to obtain the mixture;

[0029] (2) Put the ground mixture powder in a small crucible, heat up to 1200°C at a heating rate of 5°C / min, sinter at this temperature for 4 hours, and cool naturally to room temperature to obtain a sintered body;

[0030] (3) Cool the obtained sintered body to room temperature and grind it thoroughly to obtain the chemical formula Ca 3 Ga 1.75 In 0.2 Cr 0.05 Ge 4 o 14 near-infrared phosphors.

[0031] The phosphor powder prepared in this embodiment begins to appear red shift phenomenon and the emission intensity increases, and the red shift degree is the largest.

Embodiment 3

[0033] (1) Weigh each raw material according to the following weight: Weigh calcium carbonate (CaCO 3 ) 1.0009g, gallium oxide (Ga 2 o 3 ) 0.4217g, indium oxide (In 2 o 3 ) 0.2776g, chromium trioxide (Cr 2 o 3) 0.0127g and germanium oxide (Ge 2 o 3 ) 1.3952g, mixed evenly, placed in an agate mortar and fully ground for 30min to obtain the mixture;

[0034] (2) Put the ground mixture powder in a small crucible, heat up to 1200°C at a heating rate of 5°C / min, sinter at this temperature for 4 hours, and cool naturally to room temperature to obtain a sintered body;

[0035] (3) Cool the obtained sintered body to room temperature and grind it thoroughly to obtain the chemical formula Ca 3 Ga 1.35 In 0.6 Cr 0.05 Ge 4 o 14 near-infrared phosphors.

[0036] The wavelength intensity of the near-infrared phosphor prepared in this example continues to increase, and the wavelength is also red-shifted.

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Abstract

The invention discloses near-infrared fluorescent powder. A general chemical formula of the near-infrared fluorescent powder is Ca3Ga(1.95-2X)In2XCr0.05Ge4O14, wherein x is greater than or equal to 0 and is smaller than or equal to 0.975. The invention further discloses a preparation method of the near-infrared fluorescent powder. The preparation method comprises the following steps that a) oxides or carbonates containing the elements of Ca, Ga, In, Cr and Ge are weighed according to the mole ratio of all the elements in the general chemical formula of the fluorescent powder, namely, Ca3Ga(1.95-2X)In2XCr0.05Ge4O14, the oxides or the carbonates are mixed and ground to obtain a mixture, and in the general chemical formula, wherein x is greater than or equal to 0 and is smaller than or equal to 0.975; b) the mixture is heated to 1100 to 1300 DEG C for calcination for 3 to 4h, and a sintering body is obtained; and C) the sintering body is cooled down to room temperature and then fully ground to obtain the near-infrared fluorescent powder. The near-infrared fluorescent powder prepared through the preparation method is wide in excitation wavelength range, high in luminous intensity, and high in stability; and an adopted high-temperature solid-phase preparation method is simple in process, easy to operate and control, high in safety, short in preparation time and high in production efficiency, the production cost is greatly reduced compared with the prior art, and the near-infrared fluorescent powder and the preparation method thereof are suitable for large-scale industrial production, application and popularization.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method, in particular to a near-infrared fluorescent powder and a preparation method thereof. Background technique [0002] The near-infrared light region is a non-visible light region discovered earlier by people. Due to the low level of early technology, it is affected by frequency doubling and frequency combination, resulting in spectral overlap and complex analysis, which leads to certain restrictions on the research and application of near-infrared light. Until the 1960s, with the emergence of commercial instruments and a lot of work done by Norris et al., they proposed the theory that the content of the substance was linearly related to the absorption peaks at multiple different wavelength points in the near-infrared region, and used NIR diffuse reflectance technology The determination of moisture, protein, fat and other components in agricultural products has made near-infrared sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/663
Inventor 李盼来仇克亮王志军孟祥雨杨志平
Owner HEBEI UNIVERSITY
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