期刊
NANOSCALE
卷 9, 期 1, 页码 91-98出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr08675f
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资金
- National Natural Science Foundation of China [51672061]
- National Natural Science Fund for Distinguished Young Scholars [51325201]
- Fundamental Research Funds for the Central Universities, China [AUGA5710052614, AUGA8880100415, HIT.BRETIV.201503]
The ability to fabricate lanthanide-doped upconversion nanocrystals (UCNCs) with tailored size and emission profile has fuelled their uses in a broad spectrum of biological applications. Yet, limited success has been met in the preparation of sub-6 nm UCNCs with efficient upconversion photoluminescence (UCPL), which enable high contrast optical bioimaging with minimized adverse biological effects entailed by size-induced rapid clearance from the body. Here, we present a simple and reproducible approach to synthesize a set of monodispersed hexagonal-phase core NaGdF4:Yb/Ln (Ln = Er, Ho, Tm) of similar to 3-4 nm and core/shell NaGdF4:Yb/Ln@NaGdF4 (Ln = Er, Ho, Tm) UCNCs of similar to 5-6 nm. We show that the core/shell UCNCs can be up to similar to 1000 times more efficient than the corresponding core UCNCs due to the effective suppression of surface-related quenching effects for the core. The observation of prolonged PL lifetime for the core/shell than that for the core UCNCs demonstrates the role of the inert shell layer for the protection of the core. The achievement of sub-6 nm NaGdF4 UCNCs with significantly improved luminescence efficiency constitutes a solid step towards high contrast UCPL optical imaging with secured biological safety.
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