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
CN101628811AInactive Publication Date: 2010-01-20SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Publication Date
2010-01-20
Estimated Expiration
Not applicable · inactive patent

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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.
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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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