Study on the effects of 5d energy locations of Ce3+ ions on NIR quantum cutting process in Y2SiO5: Ce3+, Yb3+

The effects of the 5d energy locations of Ce centers on the NIR quantum cutting process were studied in Y2SiO5 with two different substitutional Y lattice sites for Ce and Yb. Powder XRD and Rietveld refinement were used to characterize phase purity, crystal structure, lattice parameters and occupation fractions of Y2-x-yCexYbySiO5 (x = 0.002 and 0.3, y = 0-0.2). PLE and PL spectra show that both kinds of Ce centers in Y2-xyCexYbySiO5 can cooperatively transfer energy to Yb -Yb ions pair. The dependence of the integrated emission intensities of Ce and Yb, decay lifetime (τ) of Ce, nonradiative energy transfer rate (KCe→Yb), cooperative energy transfer efficiency (ηCET) and quantum efficiency (ηQE) on the concentration of Yb ions were studied in details. 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