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Probing the local structure of the near-infrared emitting persistent phosphor LiGa5O8:Cr3+

Olivier De Clercq (UGent) , Lisa Martin (UGent) , Katleen Korthout (UGent) , Jevgenij Kusakovskij (UGent) , Henk Vrielinck (UGent) and Dirk Poelman (UGent)
(2017) JOURNAL OF MATERIALS CHEMISTRY C. 5(41). p.10861-10868
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Center for nano- and biophotonics (NB-Photonics)
Abstract
Near-infrared emitting persistent phosphors have promising applications in the field of in vivo medical imaging. In this paper, we prepared the persistent phosphor LiGa5O8:Cr3+ (LGO:Cr) which exhibits emission in the tissue transparency window and shows afterglow for multiple hours after excitation. Addition of Si or Ge improves the persistent luminescence. X-ray diffraction and electron microscopy, coupled with elemental analysis, revealed that there is a maximum amount of Si or Ge that can be incorporated in the host. Via X-ray absorption spectroscopy and electron paramagnetic resonance experiments, we studied the local environment of chromium in the LGO spinel host. The presence of both Cr3+ and Cr4+ on octahedral sites in LGO was confirmed. Electron paramagnetic resonance showed that Cr3+ resides in a rhombically distorted octahedral lattice site and that the Cr3+ local environment is sensitive to variation in point defects in the surrounding.
Keywords
X-RAY-ABSORPTION, HIGH-BRIGHTNESS, LUMINESCENCE, CR3+, EPR, SPINEL, RED, NANOPARTICLES, NANOPROBES, RESONANCE

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Chicago
De Clercq, Olivier, Lisa Martin, Katleen Korthout, Jevgenij Kusakovskij, Henk Vrielinck, and Dirk Poelman. 2017. “Probing the Local Structure of the Near-infrared Emitting Persistent Phosphor LiGa5O8:Cr3+.” Journal of Materials Chemistry C 5 (41): 10861–10868.
APA
De Clercq, Olivier, Martin, L., Korthout, K., Kusakovskij, J., Vrielinck, H., & Poelman, D. (2017). Probing the local structure of the near-infrared emitting persistent phosphor LiGa5O8:Cr3+. JOURNAL OF MATERIALS CHEMISTRY C, 5(41), 10861–10868.
Vancouver
1.
De Clercq O, Martin L, Korthout K, Kusakovskij J, Vrielinck H, Poelman D. Probing the local structure of the near-infrared emitting persistent phosphor LiGa5O8:Cr3+. JOURNAL OF MATERIALS CHEMISTRY C. 2017;5(41):10861–8.
MLA
De Clercq, Olivier, Lisa Martin, Katleen Korthout, et al. “Probing the Local Structure of the Near-infrared Emitting Persistent Phosphor LiGa5O8:Cr3+.” JOURNAL OF MATERIALS CHEMISTRY C 5.41 (2017): 10861–10868. Print.
@article{8539593,
  abstract     = {Near-infrared emitting persistent phosphors have promising applications in the field of in vivo medical imaging. In this paper, we prepared the persistent phosphor LiGa5O8:Cr3+ (LGO:Cr) which exhibits emission in the tissue transparency window and shows afterglow for multiple hours after excitation. Addition of Si or Ge improves the persistent luminescence. X-ray diffraction and electron microscopy, coupled with elemental analysis, revealed that there is a maximum amount of Si or Ge that can be incorporated in the host. Via X-ray absorption spectroscopy and electron paramagnetic resonance experiments, we studied the local environment of chromium in the LGO spinel host. The presence of both Cr3+ and Cr4+ on octahedral sites in LGO was confirmed. Electron paramagnetic resonance showed that Cr3+ resides in a rhombically distorted octahedral lattice site and that the Cr3+ local environment is sensitive to variation in point defects in the surrounding.},
  author       = {De Clercq, Olivier and Martin, Lisa and Korthout, Katleen and Kusakovskij, Jevgenij and Vrielinck, Henk and Poelman, Dirk},
  issn         = {2050-7526},
  journal      = {JOURNAL OF MATERIALS CHEMISTRY C},
  keyword      = {X-RAY-ABSORPTION,HIGH-BRIGHTNESS,LUMINESCENCE,CR3+,EPR,SPINEL,RED,NANOPARTICLES,NANOPROBES,RESONANCE},
  language     = {eng},
  number       = {41},
  pages        = {10861--10868},
  title        = {Probing the local structure of the near-infrared emitting persistent phosphor LiGa5O8:Cr3+},
  url          = {http://dx.doi.org/10.1039/c7tc02699d},
  volume       = {5},
  year         = {2017},
}

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