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Experimental analysis reveals concentration-dependent shifts in green and red up-conversion luminescence in Er-doped CaSnO3, indicating structural and electronic controls on optical tuning.
In this study, Er3+-doped CaSnO3 was synthesized by a solid-state reaction method , and the effect of Er3+ concentrationon the up-conversion (UC) luminescence was investigated. UC luminescence spectra of synthesized materials have been observed. Two typical UC luminescence in green and red wavelength regions were shown. Difference in Er3+ concentrations with the strongest luminescence intensities between green and red ones were found. To investigate why such differences appeared, crystal structures and local environment of doped Er ions were investigated by X-ray diffraction measurements and density functional theory calculations. Combining the electronic structures of Er3+ ion and host CaSnO3, change in intensity distribution of green and red UC luminescence is discussed.
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Koikawa et al. (2026) studied this question.
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