AI Article Synopsis
- Rare-earth oxyfluoride (REOF) colloidal nanocrystals (NCs) have low photoluminescence efficiency due to small size, poor crystallinity, and surface quenching effects.
- An innovative approach involves doping sodium ions into these NCs, resulting in size-controllable, well-crystallized, and highly luminescent core/shell NCs that significantly improve luminescence.
- The developed NCs show potential applications in multicolor luminescent inks for information security and high-resolution imaging in the near-infrared-IIb range, enhancing the use of rare-earth doped NCs in various fields.
Article Abstract
Rare-earth oxyfluoride (REOF) colloidal nanocrystals (NCs) suffer from a low photoluminescence efficiency due to their small size with poor crystallinity and a detrimental surface quenching effect. Herein, we introduce an innovative approach that involves doping sodium ions into REOF NCs to produce monodisperse, size-controllable, well-crystallized, and highly luminescent colloidal REOF core/shell NCs. The Na doping allows for successfully synthesizing the cubic REOF NCs with a tunable size from 6 to 30 nm. Further fabrication of the core/shell NCs doped with Na results in enhancements up to 1062 (Ho), 1140 (Er), and 2212 (Tm) folds in upconversion luminescence and 17.7 folds (Er) in downconversion luminescence compared to that of core/shell NCs without doping Na ions. These NCs were subsequently developed into multicolor luminescent inks, demonstrating significant potential application for information security, and used for near-infrared-IIb (NIR-IIb) (1500-1700 nm) imaging, which exhibits a high-resolution dynamic imaging capability with a signal-to-noise ratio of 5.28. These results present the way to the controlled synthesis of efficient luminescent cubic LuOF: RE/LuOF core/shell NCs, expanding the toolkit of rare-earth doped NCs in diverse applications such as advanced encoding encryption, varied fluorescence imaging, and biomedicine.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11688664 | PMC |
| http://dx.doi.org/10.1021/acsnano.4c10697 | DOI Listing |
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