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.
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Univ Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South AfricaUniv Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa
Yagoub, M. Y. A.
Swart, H. C.
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Univ Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South AfricaUniv Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa
Swart, H. C.
Bergman, P.
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Linkoping Univ, Dept Phys Chem & Biol, Linkoping, SwedenUniv Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa
Bergman, P.
Coetsee, E.
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Univ Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South AfricaUniv Orange Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
Yi, Guoqiang
Li, Weiwei
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
Li, Weiwei
Song, Jinghong
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Wuhan Univ Technol, Ctr Mat Res & Anal, Wuhan 430070, Hubei, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
Song, Jinghong
Mei, Bingchu
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
Mei, Bingchu
Zhou, Zhiwei
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
Zhou, Zhiwei
Su, Liangbi
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Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Adv Inorgan Mat, Shanghai 201800, Peoples R ChinaWuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China