Research progress on broadband down-conversion spectral modification based on energy transfering of rare earth ions

The Chinese Ceramic Society
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Journal Article
Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society, 2011, 39 (4), pp. 619 - 623
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Broadband down-conversion spectral modification based on energy transfer of rare earth ions has a possibility to improve the conversion efficiency of solar cell due to the prohibition of the thermal loss of the excess photon energy.Recent developments on the spectral modification were reviewed.Rare-earth ions such as Eu2+,Yb2+ and Ce3+ with f-d transitions were chosen as sensitizers, and Yb3+ was selected as luminescent center due to the matching between the energy level difference of Yb3+ and the band-gap of Si. One photon in the high energy region from 300 nm to 500 nm was split to the more low-energy photons in the near infrared region. The fluorescence decay curves and time-resolved luminescence spectra were used to investigate the energy transfer mechanism. Based on the design of material’s micro-structure,some methods for the realization of broadband down-conversion spectral modification with high efficiency were proposed
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