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中文摘要：
基于稀土离子间能量传递的宽带下转换光谱调制可作为克服太阳能电池热损耗的一种手段,具有提高太阳能电池光电转换效率的潜在可能性。本文综述了采用Eu~（2＋）、Yb~（2＋）、Ce~（3＋）等具有f-d跃迁特性的稀上离子为敏化中心,以能级差与硅禁带宽度匹配良好的Yb~（3＋）为发光中心,将300～500nm区域内的1个高能光子转换成近红外区域的多个低能光子的研究成果。通过荧光衰减曲线和时间分辨光谱等探讨了离子间能量传递的机制,进一步提出了通过微观尺度上的特定结构设计,可实现高效宽带下转换光谱调制的方案。
英文摘要：
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 Eu~（2＋）,Yb~（2＋） and Ce~（3＋） with f-d transitions were chosen as sensitizers, and Yb~（3＋） was selected as luminescent center due to the matching between the energy level difference of Yb~（3＋） 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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