Journal
DALTON TRANSACTIONS
Volume 45, Issue 20, Pages 8440-8446Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt00707d
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Funding
- National Natural Science Foundation of China [21371165, 21590794, 51372242, 21210001, 21521092, 21501167]
- Science and Technology Cooperation Special Project of Hong Kong, Macao and Taiwan [2014DFT10310]
- National Key Basic Research Program of China [2014CB643802]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2015181]
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Controlling excitation and emission wavelengths on demand is very significant in bioimaging. Up-conversion nanoparticles (UCNPs) emit visible light upon near-infrared (NIR) light excitation and are well studied in bioimaging. Red emission is usually preferred to green due to its higher tissue penetration depth in bioimaging. Herein, dominant red emission has been achieved under 808 nm excitation based on the designed alpha-NaYbF4:Mn2+/Er3+@NaLuF4:Mn2+/Yb3+@NaNdF4:Yb3+@NaGdF4 (C@S1@S2@S3) nanostructure. The rationally designed interlayer shell NaLuF4:Mn2+/Yb3+ could efficiently filter unwanted energy back-transfer from Er3+ to Nd3+ and the outmost shell NaGdF4 could prevent excitation energy from surface-related quenching. The lifetime of F-4(9/2)-> I-4(15/2) transition of Er3+ could be as high as 0.7 ms. Moreover, C@S1@S2@S3 UCNPs also possess effective contrast efficiency for both X-ray computed tomography (CT) and magnetic resonance (MR) imaging. The designed multifunctional UCNPs could be used as a potential multimodal bioprobe in bioimaging applications.
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