Er3+/Yb3+/Li+/Zn2+: Gd2(MoO4)3 upconverting nanophosphors in optical thermometry |
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| Authors: | Anita Kumari Lakshmi Mukhopadhyay Vineet Kumar Rai |
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| Affiliation: | Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, Jharkhand, India |
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| 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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| Keywords: | Upconversion Phosphors Dynamic light scattering Non-lanthanide ions Optical thermometry Rare earths |
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