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• W2007076286 abstract "A series of Yb3+-Er3+ coactivated La(Nb1-xVx)O4 (0≤x≤1) upconversion (UC) emission phosphors are prepared by high-temperature solid-state reaction method. Experimental results demonstrate that the introduction of V5+ expands and distorts the unit cell volume of LaNbO4, and induces structural transformation of LaNbO4 from Phase 1 with monoclinic fergusonite structure (0<x≤0.2) to Phase 2 with tetragonal scheelite structure (0.25≤x≤0.5) to Phase 3 with monoclinic monazite structure (x=1). Under 976 nm excitation, continuously enhanced green UC emission is observed in Phase 1 with gradual replacement of Nb5+ with the V5+ (0<x≤0.2). At x=0.2, the luminescence intensity is enhanced 1.3 times than that of the pristine sample. In Phase 2 and Phase 3, the intensity of green UC emission is decreased gradually with increasing the V5+ concentration. Based on the XRD results and crystal structural analysis, the enhanced luminescence is attributed to the lowered symmetry around La3+ ions (Er3+ ions), which relaxes the parity-forbidden selection rules of Er3+ luminescent centers. This study provides a useful approach in developing UC luminescence materials with controllable optical properties based on variations in local coordination environments through composition substitutions." @default.
• W2007076286 created "2016-06-24" @default.
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• W2007076286 date "2015-03-01" @default.
• W2007076286 modified "2023-09-27" @default.
• W2007076286 title "Enhanced upconversion luminescence induced by structrual evolution of lanthanum niobate phosphor" @default.
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• W2007076286 doi "https://doi.org/10.1016/j.ceramint.2014.10.136" @default.
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