Novel Ba(Gd1-xYx)0.78F5: 20 mol% Yb3+, 2 mol% Tm3+ (0 ≤ x ≤1.0) solid solution nanocrystals: A facile hydrothermal controlled synthesis, enhanced upconversion luminescent and paramagnetic properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:740

Article

Li, Tao¹  Li, Yanmei¹  Luo, Ran¹  Ning, Zhanglei¹  Zhao, Yan¹  Liu, Mengjiao¹  Lai, Xin¹  Zhong, Cheng²  Wang, Chao³  Zhang, Jingquan⁴  Bi, Jian¹  Gao, Daojiang¹ 

[1] Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610068, Sichuan, Peoples R China

[2] Dazhou Vocat & Tech Coll, Dept Basic Educ, Dazhou 635001, Peoples R China

[3] Univ Elect Sci & Technol China, Clean Energy Mat & Engn Ctr, Sch Microelect & Solid State Elect, Chengdu 611731, Sichuan, Peoples R China

[4] Sichuan Univ, Coll Mat Sci & Engn, Inst Solar Energy Mat & Devices, Chengdu 610064, Sichuan, Peoples R China

关键词: Ba(Gd1-xYx)(0.78)F-5: 20 mol% Yb3+, 2 mol%;    Tm3+ solid solution;    Nanocrystals;    Hydrothermal synthesis;    UC luminescent properties;    Paramagnetic properties;   

DOI  :  10.1016/j.jallcom.2018.01.040

来源: Elsevier

【 摘 要 】

Ba(Gd1-xYx)(0.78)F-5: 20 mol% Yb3+, 2 mol% Tm3+ (0 <= x <= 1.0) solid solution nanocrystals were successfully synthesized via a facile hydrothermal method, the obtained crystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), the transmission electron microcopy (TEM), energy dispersion spectrometry (EDS), photoluminescence (PL) as well as vibrating sample magnetometer (VSM), respectively. The influences of the concentration of yttrium ion (Y3+) on the micro-structures, upconversion (UC) luminescent and magnetic properties of the Ba(Gd1-xYx)(0.78)F-5: 20 mol% Yb3+, 2 mol% Tm3+ samples have been deeply investigated. XRD results showed that all the Ba(Gd1-xYx)(0.78)F-5: 20 mol% Yb3+, 2 mol% Tm3+ crystals are continuous solid solution possess a pure cubic phase structure. SEM and TEM results revealed that all the obtained crystals are quasi-spherical nanocrystals with a diameter ranging from similar to 55 nm to similar to 240 nm, and the doping of Y3+ ion can inhibit the grain growth. PL spectra indicated that all the samples exhibit main blue emission centered at 478 nm ascribed to (1)G(4)-> H-3(6) transition of Tm3+ ions, and its UC emission intensity initially increases and then notably decreases with increasing content of Y3+ ion, giving the maximum at x = 0.8. VSM results showed that all the samples present benign paramagnetism in the magnetic range of -30 to 30 kOe at 300 K due to no coercivity or no remanence. Our results confirm that the UC luminescence properties of the Ba(Gd1-xYx)(0.78)F-5: 20 mol% Yb3+, 2 mol% Tm3+ nanocrystals can be effectively modulated through the replacement of Gd3+ ions by Y3+ ions, which also can provide a relatively clear understanding of the formation process and the enhancement mechanism of UC emission for other rare earth polyfluoride solid solution nanocrystals. (C) 2018 Elsevier B.V. All rights reserved.

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