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Enhanced green upconversion luminescence in tetrahedral LiYF4:Yb/Er nanoparticles by manganese(II)-doping:The key role of host lattice

Abstract

We report the enhancement of green upconversion luminescence in tetrahedral LiYF4:Yb/Er nanoparticles by Mn2+ ions doping, which is different from the enhanced single-band red emission dominated by Mn2+ ions in cubic NaLnF4:Yb/Er (Ln=Y, Gd, Lu) nanoparticles. The energy levels of the first excited state, 4T1 of Mn2+ in tetrahedral LiYF4:Gd and cubic NaGd(Y)F4 are compared by detection of emissions from Mn2+ via the energy transition from Gd3+ to Mn2+ with excitation at 275 nm. The coordination environments of Mn2+ in these two host lattices have been investigated by X-ray absorption fine structure measurements. The results demonstrate that formation of tetrahedral MnF4 in tetragonal LiYF4 arising from replacement of Ln3+ ion with Mn2+ ions leads to higher energy level of Mn2+ 4T1 state than that in octahedral MnF6 in cubic NaYF4. The high-lying excited state of tetrahedral MnF4 is close to green emitting 4S3/2 state of Er3+ and thus enhances green upconversion emission in tetragonal LiYF4:Yb/Er, while the low-lying excited state of octahedral MnF6 dominates red emission in cubic NaYF4:Yb/Er. These findings provide direct evidence for the key roles of the host lattices and more possibilities in modulating upconversion behaviour of lanthanide-based nanoparticles by transition-metal ions doping to achieve the desired goals of specific applications.

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Publication details

The article was received on 16 Oct 2017, accepted on 28 Dec 2017 and first published on 29 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07709B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Enhanced green upconversion luminescence in tetrahedral LiYF4:Yb/Er nanoparticles by manganese(II)-doping:The key role of host lattice

    B. Zhou, B. Xu, H. He, Z. Gu, B. Tang, Y. Ma and T. Zhai, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07709B

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