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Issue 36, 2017
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A Pr3+ doping strategy for simultaneously optimizing the size and near infrared persistent luminescence of ZGGO:Cr3+ nanoparticles for potential bio-imaging

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Abstract

Spinel-phase Zn2Ga2.98−xGe0.75O8:Cr0.020,Prx (ZGGO:Cr3+,Pr3+) near infrared (NIR) persistent luminescence nanoparticles (PLNPs) with different amounts of Pr3+ dopant were prepared by a hydrothermal method in combination with a subsequent annealing in a vacuum. For these nanoparticles, the averaged particle size decreases from 64 to 37 nm with increasing Pr3+ doping concentration from 0 to 0.025 and Cr3+ and Pr3+ ions are uniformly doped into the interior and surface of a single nanoparticle. It can be found that Pr3+ doping leads to the appearance of more anti-site pairs (Image ID:c7cp02909h-t1.gif) around distorted octahedral Cr3+ ions and enhanced NIR emissions around 697 nm, which originate from the 2E(2G) → 4A2(4F) and 4T2(4F) → 4A2(4F) transitions of the interior and surface Cr3+ ions in the nanoparticles. In particular, for the interior Cr3+ ions in the Pr3+ doped nanoparticles, the enhanced NIR luminescence can be attributed to the suppressed energy transfer of the excited electrons from the 4T2(4F) level to the trap level related to anti-site pairs (Image ID:c7cp02909h-t2.gif) around the distorted octahedral Cr3+ ions. Our results suggest that Pr3+ doped ZGGO:Cr3+ PLNPs have potential applications for bio-imaging.

Graphical abstract: A Pr3+ doping strategy for simultaneously optimizing the size and near infrared persistent luminescence of ZGGO:Cr3+ nanoparticles for potential bio-imaging

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Publication details

The article was received on 03 May 2017, accepted on 04 Jul 2017 and first published on 04 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02909H
Citation: Phys. Chem. Chem. Phys., 2017,19, 24513-24521
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    A Pr3+ doping strategy for simultaneously optimizing the size and near infrared persistent luminescence of ZGGO:Cr3+ nanoparticles for potential bio-imaging

    Z. Gong, Y. Liu, J. Yang, D. Yan, H. Zhu, C. Liu, C. Xu and H. Zhang, Phys. Chem. Chem. Phys., 2017, 19, 24513
    DOI: 10.1039/C7CP02909H

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