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• W2168115425 abstract "Downconversion (DC) luminescence with emission at about 1000 nm under excitation of 448-nm light in Ho3+/Yb3+ codoped α-NaYF4 single crystal is realized. The crystal was grown by the Bridgman method using KF as an assisting flux in a NaF-YF3 system. The energy-transfer process and quantum cutting (QC) mechanisms are presented through the analysis of the spectra. The energy-transfer processes of first- and second-order cooperative DC are responsible for the increase of the emission intensity at 1000 nm, and it is the first-order cooperative DC that is dominant for the DC process. When the Ho3+ concentration is fixed at about 0.8 mol%, the optimal concentration for ∼1000 nm emission is 3.02 mol% Yb3+ in the current research. The energy-transfer efficiency and the total quantum efficiency are analyzed through the luminescence decay curves. The maximum quantum cutting efficiency approaches to 184.4% in α-NaYF4 single crystals of 0.799 mol% Ho3+ and 15.15 mol% Yb3+. However, the emission intensity at 1000 nm decreases while the energy-transfer efficiency from Ho3+ to Yb3+ increases, which may result from the fluorescence quenching between Ho3+ and Yb3+ ions, Yb3+ and Yb3+ ions." @default.
• W2168115425 created "2016-06-24" @default.
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• W2168115425 date "2015-05-26" @default.
• W2168115425 modified "2023-09-27" @default.
• W2168115425 title "Growth and downconversion luminescence of Ho³⁺/Yb³⁺codoped α-NaYF₄single crystals by the Bridgman method using a KF flux" @default.
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• W2168115425 doi "https://doi.org/10.1002/crat.201500066" @default.
• W2168115425 hasPublicationYear "2015" @default.
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