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摘要
A series of Tm3+/Yb3+ codoped tellurite glasses, which demonstrate an interesting dual-mode solar spectral converting for c-Si solar cells, have been successfully prepared by conventional high-temperature melt-quenching technique. The photoluminescence ( PL), photoluminescence excitation ( PLE) spectra along with the decay curves have been studied systematically. The results indicate that the transparent glasses show two distinguishable near infrared ( NIR) spectral converting behaviors, that is, quantum cutting ( QC) and downshifting ( DS) processes, sensitized by narrow f-f transition absorption of Tm3+: H-3(6) -> (1)G(4) at 465 nm and broad absorption band due to charge-transfer state ( CTS) of Yb3+-O2- at 320 nm, respectively. The Tm3+/Yb3+ codoped tellurite glasses convert ultraviolet ( 240-400 nm) and blue ( 450-490 nm) photons into NIR ( 920-1100 nm) ones, which well match the optimal spectral response of silicon ( Si) solar cells. The prepared tellurite glass can be potentially utilized as spectral converter to improve the photovoltaic conversion of c-Si solar cells. The dual-mode solar spectrum converting material might explore a novel approach to realize UV-Vis to NIR downconversion for Si solar cells application.
- 出版日期2016-7
- 单位重庆邮电大学
