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- W4293408440 abstract "Fluorotellurite glass codoped with erbium and ytterbium was elaborated through the melting-quenching route. Through the DSC and Raman measurements, the investigated glass samples presented high thermal stability and low phonon energy, respectively. By using the laser excitation at 488 nm, the downconversion mechanism in the Er 3+ /Yb 3+ system was investigated and the energy transfers implicated in the emissions of erbium and ytterbium ions were discussed based on the different cross-relaxation processes. The addition of ytterbium resulted in an effective energy transfer from the excited 4 S 3/2 / 2 H 11/2 state of Er 3+ ions to the emitting 2 F 5/2 state of Yb 3+ ion, which considerably enhanced NIR emissions at 1000 nm and reduced experimental lifetimes of 4 S 3/2 / 2 H 11/2 states. Through luminescence decay analysis, the maximum values of quantum efficiency (η QE ) and energy transfer efficiency (η ET ) were estimated as 61.2% and 161.2%, respectively. This result indicates that the proposed glasses can convert visible photons into NIR emissions at 1000 nm suitable to improve the spectral response of crystalline silicon PV cells." @default.
- W4293408440 created "2022-08-29" @default.
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- W4293408440 date "2022-11-01" @default.
- W4293408440 modified "2023-10-14" @default.
- W4293408440 title "Downconversion mechanism in Er3+/Yb3+ codoped fluorotellurite glasses to enhance the efficiency of c-Si PV cells" @default.
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- W4293408440 doi "https://doi.org/10.1016/j.jnoncrysol.2022.121837" @default.
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