Abstract
Er3+-Yb3+-Li+:Gd2(MoO4)3 and Er3+-Yb3+-Zn2+:Gd2(MoO4)3 nanophosphors, synthesized by chemical co-precipitation technique were characterized through XRD, FESEM, dynamic light scattering (DLS), diffuse reflectance, photoluminescence, photometric and decay time analysis. The enhancement of about ∼28, ∼149 and ∼351 times in the green upconversion emission band is observed for the optimized Er3+-Yb3+, Er3+-Yb3+-Li+ and Er3+-Yb3+-Zn2+:Gd2(MoO4)3 nanophosphors in comparison to the singly Er3+ doped nanophosphors. The electric dipole-dipole interaction is found to be responsible for the concentration quenching. The temperature dependent behaviour of the two green thermally coupled levels of the Er3+ ions based on the fluorescence intensity ratio technique was studied. The maximum sensor sensitivity ∼38.7 × 10−3 K−1 at 473 K for optimized Er3+-Yb3+-Zn2+ codoped Gd2(MoO4)3 nanophosphors is reported with maximum population redistribution ability ∼88% among the 2H11/2 and 4S3/2 levels.
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