Er3+/Yb3+/Li+/Zn2+:Gd2（MoO4）3 upconverting nanophosphors in optical thermometry
来源期刊：JOURNAL OF RARE EARTHS2019年第3期
论文作者：Anita Kumari Lakshmi Mukhopadhyay Vineet Kumar Rai
文章页码：242 - 247
摘 要：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.
Anita Kumari，Lakshmi Mukhopadhyay，Vineet Kumar Rai
Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines)
摘 要：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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