Synthesis and up-conversion of core/shell SrF2:Yb3+,Er3+@SrF2:Yb3+,Nd3+ nanoparticles under 808, 975, and 1532 nm excitation wavelengths

JOURNAL OF ALLOYS AND COMPOUNDS

卷:831

Article

Przybylska, Dominika¹  Grzyb, Tomasz¹ 

[1] Adam Mickiewicz Univ, Fac Chem, Dept Rare Earths, Uniwersytetu Poznanskiego 8, PL-61614 Poznan, Poland

关键词: Strontium fluoride;    Luminescence;    Down-conversion;    Biological windows;    Dual-range emission;    Hydrothermal method;   

DOI  :  10.1016/j.jallcom.2020.154797

来源: Elsevier

【 摘 要 】

Sensitization of nanoparticles (NPs) by appropriate lanthanide ions is crucial for the obtained spectroscopic properties. Nd3+ ions can absorb light at around 808 nm, allowing for deep tissue imaging, Yb3+ ions can be effectively excited by 975 nm radiation which is utilized in many areas, e.g. in anti-counterfeit applications, while Er3+ ions are capable of absorption around 1532 nm, which in turn, is important for solar energy conversion. Here, we describe a method for Nd3+ and Er3+ ions isolation in NPs by the synthesis of core/shell structures. As an alternative to the most commonly used core/shell thermal decomposition synthesis procedures, our products were obtained in water by a hydrothermal method. SrF2:Yb3+,Er3+@SrF2:Yb3+,Nd3+ NPs with sizes between 30 and 60 nm showed intense green to yellowish-red luminescence in the visible range, due to Er3+-doping. Yb3+ played the role of bridging ions, transferring energy absorbed by Nd3+ ions between the shell and core phases, limiting, in the same way, cross-relaxation between Nd3+ sensitizer ions and Er3+ luminescence centers. Structure, morphology and spectroscopic properties were investigated, revealing interesting processes taking place in the prepared NPs. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free