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Transparent ceramic and preparation method thereof

A technology of transparent ceramics and structural formula, applied in the field of transparent ceramics and its preparation, can solve the problems of harmfulness to human body and environment, strong scattering of phosphor powder, easy aging, etc., and achieve the effect of improving conversion efficiency, simple preparation process and good transmittance

Inactive Publication Date: 2010-01-20
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current designs are based on fluorescent powder and oxyfluoride glass ceramics, and thus there are corresponding problems in use: the fluorescent powder itself has a strong scattering of light, on the one hand it can convert a visible photon into Two near-infrared photons, but on the other hand it greatly reduces the transmittance of sunlight, so the actual effect is likely to outweigh the gain
Although oxyfluoride glass ceramics can obtain high transmittance, its components are harmful to the human body and the environment because of the fluoride contained in them.
In addition, phosphors and oxyfluoride glass ceramics have relatively poor anti-ultraviolet radiation properties and are prone to aging.

Method used

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  • Transparent ceramic and preparation method thereof
  • Transparent ceramic and preparation method thereof

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Experimental program
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Embodiment 1

[0025] Using yttrium oxide (Y) with a purity of 99.9% 2 o 3 ), alumina (Al 2 o 3 ), ytterbium oxide (Yb 2 o 3 ) and cerium oxide (CeO 2 ) powder as raw material, according to Ce 0.003 Yb 0.006 Y 2.991 al 5 o 12 The composition of the powder raw materials is configured, and then the ceramic powder is prepared by wet ball milling with absolute ethanol as the medium. The powder is dried, granulated, and pressed into tablets; then it is subjected to cold isostatic pressure above 200MPa; finally put into a vacuum The sintering furnace was sintered at 1600°C for 5 hours, and the vacuum degree in the sintering and holding stage was 2.5×10 -3 Pa, get Ce 0.003 Yb 0.006 Y 2.991 al 5 o 12 Transparent ceramic.

[0026] The transparent ceramics were experimented to obtain as figure 1 and figure 2 The experimental results: figure 1 Ce prepared for Example 1 of the present invention 0.03 Yb 1.5 Y 1.47al 5 o 12 Transmittance curves of transparent ceramics (thickness 1...

Embodiment 2

[0029] The sintering holding temperature is 1750°C, and other conditions are the same as in Example 1, and Ce can also be obtained 0.003 Yb 0.006 Y 2.991 al 5 o 12 Transparent ceramic.

Embodiment 3

[0031] The sintering holding temperature is 1650°C, and other conditions are the same as in Example 1, and Ce can also be obtained 0.003 Yb 0.006 Y 2.991 al 5 o 12 Transparent ceramic.

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Abstract

The invention relates to a transparent ceramic and a preparation method thereof; the structural formula of the transparent ceramic is LnxYbyY(3-x-y)Al5O12 or LnwYbzY(2-w-z)O3, wherein, x is not less than 0.003 and not more than 0.03, y is not less than 0.006 and not more than 1.5, w is not less than 0.002 and not more than 0.02, z is not less than 0.004 and not more than 1 and Ln represents lanthanide element Ce, Tm, Pr or Tb. The preparation method comprises the following steps: adopting yttrium oxide, aluminum oxide and ytterbium oxide of which purities are not less than 99.9% and using one of cerium oxide, thulium oxide, praseodymium oxide and terbium oxide as raw materials, proportioning the raw materials powder according to the structural formula of the transparent ceramic, preparing ceramic powder material by adopting wet milling and using absolute ethanol as medium, drying the powder, pelleting, performing, pressing with 200MPa of cold isostatic pressing and obtaining LnxYbyY(3-x-y)Al5O12 or LnwYbzY(2-w-z)O3 transparent ceramic. The invention can increase the conversion efficiency of single crystal silicon and polysilicon solar cells.

Description

technical field [0001] The invention relates to transparent ceramics, in particular to a transparent ceramic and a preparation method thereof. Background technique [0002] Improving the photoelectric conversion efficiency of solar cells has been the goal that people have been pursuing for a long time. An important reason for limiting the conversion efficiency of monocrystalline silicon and polycrystalline silicon solar cells is that the corresponding bands of their strongest spectra are in the near-infrared region, while the strongest wavelength band of solar radiation is in the visible light range. After high visible light photons, the thermalization effect of carriers will occur, resulting in a decrease in conversion efficiency. In view of the above problems, it is proposed to convert one visible light photon into two near-infrared light photons by means of cooperative down conversion, so as to improve the conversion efficiency of monocrystalline silicon and polycrystall...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/505C04B35/622
Inventor 林辉周圣明
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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