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Fluorescent powder and preparation method thereof

A phosphor, infrared light technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of cumbersome, increased process, energy loss of mixture, etc., and achieve the effect of simple composition, simple synthesis process and high stability

Inactive Publication Date: 2015-02-25
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to make full use of the energy of each band of the solar spectrum, it is usually necessary to perform light up-conversion and down-conversion at the same time, so a variety of phosphors are required to achieve it separately. However, due to the mixing of various phosphors, considering the ratio of various phosphors This increases the complexity of the process and also increases the cost, and there are problems such as energy loss, color reabsorption and aging rates between the mixtures

Method used

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  • Fluorescent powder and preparation method thereof
  • Fluorescent powder and preparation method thereof
  • Fluorescent powder and preparation method thereof

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Embodiment 1

[0024] The flow chart of the synthesis method of the embodiment of the present invention is as follows Figure 5 shown. Using YF with a purity of 99.99% 3 , TmF 3 As the main raw material, the molecular composition is obtained as Tm x Y 1-x f 3 Sample (x takes a value of 0.05). Accurately weigh 0.9247g YF 3 and 0.0753g TmF 3 , mix well in a mortar and grind for 1 hour. Then add 5 mL of alcohol and grind for 1 hour. After drying at room temperature, the above mixture was placed in a corundum crucible and calcined in a high-temperature furnace with an HF atmosphere. The HF atmosphere was composed of NH 4 HF 2 Provided by decomposition; the calcination temperature is 700°C, and the calcination time is 6 hours. After the temperature of the sample was naturally lowered to room temperature with the high-temperature furnace, the sintered product was crushed to the required particle size to obtain the sample of the embodiment.

[0025] The embodiment of the present inventi...

Embodiment 2

[0027] The flow chart of the synthesis method of the embodiment of the present invention is as follows Figure 5 shown. Using YF with a purity of 99.99% 3 , TmF 3 As the main raw material, the molecular composition is obtained as Y 1-x T m x f 3 Sample (x takes a value of 0.1). Accurately weigh 0.8532g YF 3 and 0.1468g TmF 3 , mix well in a mortar and grind for 1 hour. Then add 5 mL of alcohol and grind for 1 hour. After drying at room temperature, the above mixture was placed in a corundum crucible, and placed in a high-temperature furnace for calcination, and the HF atmosphere was composed of NH 4 HF 2 Provided by decomposition; the calcination temperature is 700°C, and the calcination time is 6 hours. After the temperature of the sample was naturally lowered to room temperature with the high-temperature furnace, the sintered product was crushed to the required particle size to obtain the sample of the embodiment.

[0028] The embodiment of the present invention ...

Embodiment 3

[0030] The flow chart of the synthesis method of the embodiment of the present invention is as follows Figure 5 shown. Using YF with a purity of 99.99% 3 , TmF 3 As the main raw material, the molecular composition is obtained as Y 1-x T m x f 3 Sample (x takes a value of 0.0001). Accurately weigh 0.9998g YF 3 and 0.0002g TmF 3 , mix well in a mortar and grind for 1 hour. Then add 5 mL of alcohol and grind for 1 hour. After drying at room temperature, the above mixture was placed in a corundum crucible, and placed in a high-temperature furnace for calcination, and the HF atmosphere was composed of NH 4 HF 2 Provided by decomposition; the calcination temperature is 700°C, and the calcination time is 6 hours. After the temperature of the sample was naturally lowered to room temperature with the high-temperature furnace, the sintered product was crushed to the required particle size to obtain the sample of the embodiment.

[0031] The embodiment of the present inventi...

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Abstract

The invention discloses fluorescent powder and a preparation method thereof. The fluorescent powder is capable of converting under both ultraviolet high-frequency light with the wavelength about 315nm and infrared low-frequency light with the waveband of 1100-1300nm. Chemical composition of the fluorescent powder conforms to Rx Y1-x F3, wherein the R refers to rare earth element Tm, and 0<x<=0.1. The fluorescent powder is prepared by high-temperature solid-phase reaction, and the prepared fluorescent powder is capable of emitting blue light with the central wavelength of 475nm, red light with the central wavelength of 700nm and infrared light with the central wavelength of 800nm under excitation of the ultraviolet light and the infrared light.

Description

technical field [0001] The invention relates to a fluorescent material capable of simultaneously realizing high-frequency light down-conversion and low-frequency light up-conversion and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] As a renewable and non-polluting energy source, the sun has always been valued by human beings. The wavelength corresponding to the maximum energy of solar radiation is 475nm, and nearly 99% of the solar energy is distributed in the wide band of 220-4000nm. A solar cell is a device that converts sunlight into electricity. However, due to the limitation of the semiconductor energy gap width, all kinds of solar cells can only realize relatively high-efficiency photoelectric conversion for light in their specific spectral ranges, usually concentrated in 400nm-900nm. In the near-infrared region, photoelectric conversion is limited by the forbidden band width Eg of polysilicon, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
Inventor 颜晓红陈远刘晴
Owner NANJING UNIV OF POSTS & TELECOMM
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