Ultraviolet-Visible-Near-Infrared Luminescence Properties and Energy Transfer Mechanism of a Novel 5d Broadband Sensitized Sr_3SiO_5:Ce~(3+),Yb~(3+) Suitable for Solar Spectral Converter

摘要

A near-infrared phosphor, Sr_3SiO_5:Ce~(3+),Yb~(3+), is developed as a potential solar spectral converter for Si solar cells.The diffuse reflection, photoluminescence excitation, and emission spectra at room temperature and at 3K were investigated.These results show that the Sr_3SiO_5:Ce~(3+),Yb~(3+) phosphor has broadband absorptions peaking at 415 nm which can efficiently facilitate the UV-blue part of the solar spectrum when compared with Sr_3SiO_5:Yb~(3+).Furthermore, it can give an intense emission around 1000nm via an energy transfer process from Ce~(3+) to Yb~(3+), matching well with the optimal spectral response of Si solar cells.The cooperative quantum cutting mechanism is also proposed.