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Issue 24, 2017
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A novel anion doping strategy to enhance upconversion luminescence in NaGd(MoO4)2:Yb3+/Er3+ nanophosphors

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Abstract

We propose a novel and efficient F anion doping strategy for enhancing upconversion luminescence in upconversion nanophosphors. NaGd(MoO4)2:Yb3+/Er3+ nanophosphors doped with different F contents are synthesized hydrothermally. Rietveld refinement results obtained from X-ray diffraction data indicate that the Gd–O bond length decreases and the O–Gd–O bond angle varies with increasing F content, resulting in augmented local crystal field strength and distorted local site symmetry of the dopant lanthanide sites. Judd–Ofelt analysis suggests that the calculated radiative quantum efficiency of the 4S3/2 level and the radiative branching ratio of 4S3/24I15/2 transition in F-doped NaGd(MoO4)2:Yb3+/Er3+ nanophosphors are much greater than those in F anion-free samples. It is inferred that F anion doping helps to reduce the nonradiative transition probabilities based on the luminescence dynamics. Rietveld refinement results and Judd–Ofelt analysis confirm jointly that doping of interstitial F anions could enhance local crystal field strength with odd parity and modify site symmetry of the lanthanide activator ions, leading to enhanced radiative transitions and inhibited nonradiative transitions. A maximum of 17-fold enhancement of total emission intensity is found in NaGd(MoO4)2:Yb3+/Er3+/F nanophosphors compared with F anion-free counterparts. The proposed F anion doping strategy provides an alternative approach for enhancing upconversion luminescence efficiency and could be extended to other inorganic upconversion nanomaterials.

Graphical abstract: A novel anion doping strategy to enhance upconversion luminescence in NaGd(MoO4)2:Yb3+/Er3+ nanophosphors

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Publication details

The article was received on 08 Feb 2017, accepted on 05 May 2017 and first published on 25 May 2017


Article type: Paper
DOI: 10.1039/C7CP00855D
Citation: Phys. Chem. Chem. Phys., 2017,19, 15693-15700
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    A novel anion doping strategy to enhance upconversion luminescence in NaGd(MoO4)2:Yb3+/Er3+ nanophosphors

    A. Li, D. Xu, H. Lin, L. Yao, S. Yang, Y. Shao, Y. Zhang and Z. Chen, Phys. Chem. Chem. Phys., 2017, 19, 15693
    DOI: 10.1039/C7CP00855D

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