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Issue 20, 2018
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Morphology/dimensionality induced tunable upconversion luminescence of BiOCl:Yb3+/Er3+ nano/microcrystals: intense single-band red emission and underlying mechanisms

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Abstract

Preparation of lanthanide (Ln3+)-doped upconversion (UC) materials with controlled morphology/dimensionality is desired to fulfill the requirements of different applications. In this work, a series of BiOCl:Yb3+/Er3+ nano/microcrystals with multiform morphologies, such as 1D nanorods (NRs), 2D nanoplates (NPs), and 3D hierarchical architectures (HAs), were successfully synthesized via a facile solvothermal method by altering the Bi source and reaction solvent. Furthermore, the dependences of UC luminescence performance on morphology/dimensionality have been discussed in detail and compared with each other. The results show that with increasing dimensionality from 1D to 3D, the UC luminescence intensities of red emission are enhanced 4-fold , and the red-to-green (R/G) ratio is increased from 2.5 to 85.4. The energy-back-transfer [4S3/2 (Er3+) + 2F7/2 (Yb3+) → 4I13/2 (Er3+) + 2F5/2 (Yb3+)] processes and the non-radiative relaxation [4I11/2 (Er3+) → 4I13/2 (Er3+)] rate are found to be responsible for the morphology/dimensionality dependent UC luminescence properties, confirmed by rate equation modeling. The above results may be helpful for design and fabrication of high performance BiOCl:Yb3+/Er3+ UC materials, and the 3D HA BiOCl:Yb3+/Er3+ nano/microcrystals may have a promising application in biological imaging.

Graphical abstract: Morphology/dimensionality induced tunable upconversion luminescence of BiOCl:Yb3+/Er3+ nano/microcrystals: intense single-band red emission and underlying mechanisms

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Publication details

The article was received on 23 Mar 2018, accepted on 23 Apr 2018 and first published on 26 Apr 2018


Article type: Paper
DOI: 10.1039/C8CE00451J
Citation: CrystEngComm, 2018,20, 2850-2860
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    Morphology/dimensionality induced tunable upconversion luminescence of BiOCl:Yb3+/Er3+ nano/microcrystals: intense single-band red emission and underlying mechanisms

    Y. Li, Z. Song, L. Yao, S. Yang and Y. Zhang, CrystEngComm, 2018, 20, 2850
    DOI: 10.1039/C8CE00451J

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