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Er~(3+) doped Y_2Ti_2O_7 phosphors were prepared by the high temperature solid state reaction method at 1500℃.X-ray diffraction and luminescence spectra were used to characterize the properties of samples.Due to the layer distribution of Y~(3+) ions in the pyrochlore Y_2Ti_2O_7 crystal,Er~(3+) ions,replacing Y~(3+) in Y_2Ti_2O_7 crystal,could realize high-concentration doping by suppressing energy migration between layers to minimize concentration quenching.Investigation on the upconversion characteristic of Y_2Ti_2O_7:Er~(3+)showed that the optimal doping concentration of Er~(3+) was up to 28 mol.%.Y_2Ti_2O_7:0.28 Er~(3+) exhibited both dominating red emission under 980 and 1550 nm excitation.The brightness of Y_2Ti_2O_7:0.28Er~(3+) were 4 times(980 nm) and 7 times(1550 nm) higher than that of Y_2Ti_2O_7:0.05Er~(3+).And Y_2Ti_2O_7:Er~(3+) presented much better red emission color purity and stability under 1550 nm excitation.
Er ~ (3+) doped Y_2Ti_2O_7 phosphors were prepared by the high temperature solid state reaction method at 1500 ℃. X-ray diffraction and luminescence spectra were used to characterize the properties of samples. To the layer distribution of Y ~ (3+ ) ions in the pyrochlore Y_2Ti_2O_7 crystal, Er ~ (3+) ions, replacing Y ~ (3+) in Y_2Ti_2O_7 crystal, could realize high-concentration doping by suppressing irradiation energy migration between layers to minimize concentration quenching. Investigation on the upconversion characteristic of Y 2 Ti 2 O 7: Er ~ (3+) showed that the optimal doping concentration of Er ~ (3+) was up to 28 mol%. Y_2Ti_2O_7: 0.28 Er 3+ exhibited both dominating red emission under 980 and 1550 nm excitation. The brightness of Y_2Ti_2O_7: 0.28Er ~ (3+) were 4 times (980 nm) and 7 times (1550 nm) higher than that of Y_2Ti_2O_7: 0.05Er ~ (3 +). And Y_2Ti_2O_7: Er ~ (3+) presented much better red emission color purity and stability under 1550 nm excitation.