Upconversion luminescence of Y₂Ti₂O₇:Er³⁺ under 1550 and 980 nm excitation

【摘要】 Er³⁺ doped Y₂Ti₂O₇ 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 Y³⁺ ions in the pyrochlore Y₂Ti₂O₇ crystal,Er³⁺ ions,replacing Y³⁺ in Y₂Ti₂O₇ crystal,could realize high-concentration doping by suppressing energy migration between layers to minimize concentration quenching.Investigation on the upconversion characteristic of Y₂Ti₂O₇:Er³⁺showed that the optimal doping concentration of Er³⁺ was up to 28 mol.%.Y₂Ti₂O₇:0.28 Er³⁺ exhibited both dominating red emission under 980 and 1550 nm excitation.The brightness of Y₂Ti₂O₇:0.28Er³⁺ were 4 times（980 nm） and 7 times（1550 nm） higher than that of Y₂Ti₂O₇:0.05Er³⁺.And Y₂Ti₂O₇:Er³⁺ presented much better red emission color purity and stability under 1550 nm excitation.更多还原

【Abstract】 Er³⁺ doped Y₂Ti₂O₇ 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 Y³⁺ ions in the pyrochlore Y₂Ti₂O₇ crystal,Er³⁺ ions,replacing Y³⁺ in Y₂Ti₂O₇ crystal,could realize high-concentration doping by suppressing energy migration between layers to minimize concentration quenching.Investigation on the upconversion characteristic of Y₂Ti₂O₇:Er³⁺showed that the optimal doping concentration of Er³⁺ was up to 28 mol.%.Y₂Ti₂O₇:0.28 Er³⁺ exhibited both dominating red emission under 980 and 1550 nm excitation.The brightness of Y₂Ti₂O₇:0.28Er³⁺ were 4 times（980 nm） and 7 times（1550 nm） higher than that of Y₂Ti₂O₇:0.05Er³⁺.And Y₂Ti₂O₇:Er³⁺ presented much better red emission color purity and stability under 1550 nm excitation.更多还原