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Issue 20, 2018, Issue in Progress
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Enhanced near infrared persistent luminescence of Zn2Ga2.98Ge0.75O8:Cr0.023+ nanoparticles by partial substitution of Ge4+ by Sn4+

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Abstract

Spinel-phase Zn2Ga2.98Ge0.75–xSnxO8:Cr0.023+ (ZGGSO:Cr3+) nanoparticles with various Sn4+ concentrations were prepared by a hydrothermal method in combination with a post-annealing in vacuum at high temperature. For these nanoparticles, the observed near infrared (NIR) persistent luminescence peaked at ∼697 nm and originates from the 2E, 4T2 (4F) → 4A2 transitions of Cr3+ and the afterglow time exceeds 800 min. For both the interior and surface Cr3+ ions in the ZGGSO host, it can be found that the increased energy transfer from Cr3+ to the deep trap (anti-site defects, Image ID:c8ra01036f-t1.gif) after the substitution of Ge4+ by Sn4+ plays a key role in enhancing the persistent luminescence of the ZGGSO:Cr3+ nanoparticles. Strikingly, this energy transfer process can be controlled through the variations in the crystal field strength and the trap depths. Our results suggest that not only Sn4+ substitution can improve in vivo bioimaging but also the existence of deep traps in ZGGSO:Cr3+ nanoparticles is helpful for retracing in vivo bioimaging at any time.

Graphical abstract: Enhanced near infrared persistent luminescence of Zn2Ga2.98Ge0.75O8:Cr0.023+ nanoparticles by partial substitution of Ge4+ by Sn4+

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Publication details

The article was received on 02 Feb 2018, accepted on 12 Mar 2018 and first published on 19 Mar 2018


Article type: Paper
DOI: 10.1039/C8RA01036F
Citation: RSC Adv., 2018,8, 10954-10963
  • Open access: Creative Commons BY-NC license
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    Enhanced near infrared persistent luminescence of Zn2Ga2.98Ge0.75O8:Cr0.023+ nanoparticles by partial substitution of Ge4+ by Sn4+

    T. Song, M. Zhang, Y. Liu, J. Yang, Z. Gong, H. Yan, H. Zhu, D. Yan, C. Liu and C. Xu, RSC Adv., 2018, 8, 10954
    DOI: 10.1039/C8RA01036F

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