Energy transfer of the quantum-cutter couple Pr3+-Mn2+ in CaF2:Pr3+, Mn2+ nanoparticles

被引:20
|
作者
Kuzmanoski, Ana [1 ]
Pankratov, Vladimir [2 ]
Feldmann, Claus [1 ]
机构
[1] Karlsruhe Inst Technol, Inst Inorgan Chem, Engesserstr 15, D-76131 Karlsruhe, Germany
[2] Univ Oulu, Res Ctr Mol Mat, POB 3000, Oulu 90014, Finland
基金
芬兰科学院;
关键词
Calcium fluoride; Nanoparticle; Pr-Mn couple; Quantum cutting; LUMINESCENT MATERIALS; DOWNCONVERSION; SPECTRA; PR3+; GAS;
D O I
10.1016/j.jlumin.2016.07.040
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
CaF2:Pr (1 mol%), CaF2:Mn (5 mol%) and CaF2:Pr,Mn (1 mol%, 5 mol%) nanoparticles are prepared via a microwave-mediated synthesis in ionic liquids. The nanoparticles are highly crystalline and exhibit particle diameters <50 nm. In contrast to bulk-CaF2:Pr,Mn,energy transfer between Pr3+ and Mn2+ under S-1(0)-> I-1(16) relaxation on Pr3+ and (4)G(T-4(1g))-> S-6(A(1g)) emission of Mn2+ is observed for the first time. Such energy transfer represents the essential first step of the quantum-cutting cascade via the Pr3+-Mn2+ couple, which is most interesting as both expected photons - P-3(0) -> H-3(4) emission of Pr3+ and (4)G(T-4(1g))-> S-6 ((A1)g) emission of Mn2+ - are emitted in the green spectral range. While bulk crystals were said not to show energy transfer due to prohibiting selection rules, vacuum ultraviolet (VUV) spectroscopy of CaF2: Pr, Mn nanoparticles firstly proves efficient Pr3+ -> Mn2+ energy transfer, which can be ascribed to the reduced site symmetry and considerable spin-orbit interaction in the nanocrystals. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:555 / 561
页数:7
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