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Lanthanide-doped LaOBr nanocrystals: controlled synthesis, optical spectroscopy and bioimaging

Abstract

Lanthanide (Ln3+)-doped nanocrystals (NCs) have shown great promise in diverse bioapplications. Exploring new host materials to realize efficient downshifting (DS) and upconversion (UC) luminescence is a goal of general concern. Ln3+-doped oxybromides, which bring together the advantages of high chemical/thermal stability of oxides and low phonon energy of bromides, are rarely reported so far. Herein, we report the synthesis of monodisperse tetragonal-phase LaOBr:Ln3+ NCs via a modified thermal decomposition approach. Ln3+ dopants in LaOBr NCs occupying surface and lattice sites were verified based on high-resolution photoluminescence spectra of Eu3+ at 10 K. Intense DS emissions were observed in Ce3+ and Ce3+/Tb3+ doped LaOBr NCs upon excitation at 353.0 nm, which is far from the deep-UV absorption band of protein. Moreover, UC properties of LaOBr:Yb3+/Ho3+ and Yb3+/Er3+ NCs were comprehensively surveyed upon near-infrared excitation at 980 nm. Particularly, the red-to-green ratio can be markedly increased from 0.1 to ~300 in LaOBr:Yb3+/Er3+ NCs, resulting in high-chromatic-purity single-band red UC emission. Furthermore, we have employed the LaOBr:Ln3+ NCs for cancer cell imaging by virtue of their superior optical properties, showing great potentials of LaOBr:Ln3+ nanoprobes in bioimaging.

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Publication details

The article was received on 29 Mar 2017, accepted on 05 May 2017 and first published on 05 May 2017


Article type: Paper
DOI: 10.1039/C7TB00857K
Citation: J. Mater. Chem. B, 2017, Accepted Manuscript
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    Lanthanide-doped LaOBr nanocrystals: controlled synthesis, optical spectroscopy and bioimaging

    H. Wang, D. Tu, J. Xu, X. Shang, P. Hu, R. Li, W. Zheng, Z. Chen and X. Chen, J. Mater. Chem. B, 2017, Accepted Manuscript , DOI: 10.1039/C7TB00857K

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