Enhancement of upconversion emission and temperature sensing of paramagnetic Gd2Mo3O9: Er3+/Yb3+ phosphor via Li+/Mg2+ co-doping

被引：45
作者：
Sinha, Shriya [1 ]
Mondal, Ashok [1 ]
Kumar, Kaushal [1 ]
Swart, H. C. [2 ]
机构：
[1] Indian Sch Mines, Indian Inst Technol, Dept Appl Phys, Opt Mat & Bioimaging Res Lab, Dhanbad 826004, Bihar, India
[2] Univ Free State, Dept Phys, Bloemfontein, South Africa
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 747卷
关键词：
Upconversion; Temperatures sensing; Magnetic property; Multifunctional material; SENSITIVE THERMOGRAPHIC PHOSPHOR; RED-EMITTING PHOSPHOR; GADOLINIUM MOLYBDATE; PHOTOTHERMAL THERAPY; YB3+ CONCENTRATION; ENERGY MIGRATION; LUMINESCENCE; NANOCRYSTALS; NANOPARTICLES; LANTHANIDE;
D O I：
10.1016/j.jallcom.2018.02.162
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Herein, enhancement of upconversion emission and temperature sensing in Li+/Mg2+ co-doped Gd2Mo3O9:Er3+/Yb3+ is reported. The upconversion emission enhancement of 53 and 21 times is observed in green (524 nm) and red (660 nm) emission bands via simultaneous co-doping of Li+/Mg2+ ions and is explained in terms of radiative and non-radiative transition rates. High thermal sensitivity of the material is realized upon Li+/Mg2+ co-doping by measuring the fluorescence intensity ratio of two thermally coupled energy levels (H-2(11/2) & S-4(3/2)) of Er3+ ion. The maximum absolute sensitivity of 0.0230 K-1 at 513 K is found for present material and is among the highest measured sensitivities for luminescence based thermometers. Additionally, improved magnetization and magnetic mass susceptibility is also observed on co-doping of Li+/Mg2+ in the material. The result suggests that simultaneous incorporation of Li+/Mg2+ is an effective approach for enhancing multifunctionality of Gd2Mo3O9:Er3+/Yb3+ phosphor and this material has potential applications in colour displays, high temperature sensing and magnetic resonance imaging. (C) 2018 Published by Elsevier B.V.
引用
收藏
页码：455 / 464
页数：10
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