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Enhanced upconversion luminescence and controllable phase/shape in NaYF4:Yb/Er crystals through Cu2+ ions doping

Abstract

Hexagonal phase (β-) NaYF4:Yb/Er upconversion (UC) microrods doped with Cu2+ ions were prepared via a facile solvothermal method. The simultaneous phase and shape control of NaYF4:Yb/Er crystals with enhanced upconversion luminescence (UCL) has been successfully realized by codoping with Cu2+ ions. With increasing Cu2+ ion concentration in NaYF4:Yb/Er system, the crystal structure changed from the co-existence of α- and β-phases to pure β-phase and converted into highly uniform microrods. As for Cu2+ ions doped β-NaYF4:Yb/Er upconversion microrods, the maximum emission occurs at a sample adding 60 mol% Cu2+ ions and the UCL intensities of the green and red emissions were enhanced by 37 and 25 times, respectively. Meanwhile, the possible mechanisms for the enhanced UCL in NaYF4:Yb/Er crystals were also discussed in detail. Moreover, the temperature dependent UCL property of 60 mol% Cu2+ ions doped β-NaYF4:Yb/Er was realized under 980 nm excitation,which was temperature-sensitive over a wide temperature ranging from 123 K to 423 K. The change of UCL intensity influenced by temperature was discussed in detail.

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Publication details

The article was received on 27 Dec 2017, accepted on 05 Feb 2018 and first published on 07 Feb 2018


Article type: Paper
DOI: 10.1039/C7CE02227A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Enhanced upconversion luminescence and controllable phase/shape in NaYF4:Yb/Er crystals through Cu2+ ions doping

    K. Du, X. Xu, S. Yao, P. Lei, L. Dong, M. Zhang, J. Feng and H. Zhang, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE02227A

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