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Sample Nomenclature
\f1\b0 \
\
C (Core)\
--------\
Bare NaGdF4:Yb0.2,Er0.02 core nanoparticles without any shell coating. Average diameter: ~6.7 nm.\
\
CS1-CS4 (Core-Shell 1-4)\
--------------------------\
A series of NaGdF4:Yb0.2,Er0.02@NaGdF4 core-shell nanoparticles with precisely controlled, systematically increasing inert shell thicknesses (0.8 to 3.0 nm). T\
\
| Sample | Diameter      | Shell Thickness |\
|----------|----------------|-------------------|\
| CS1      |  8.3 nm         | 0.8 nm               |\
| CS2      |  9.5 nm         | 1.4 nm               |\
| CS3      | 11.2 nm        | 2.2 nm               |\
| CS4      | 12.6 nm        | 3.0 nm               |\
\
\
Reference\
---------\
Jiang et al., "Balancing Molecular Sensitization and Surface Passivation in Lanthanide-Doped Nanoparticle-Based Organic-Inorganic Nanohybrids," Nano Lett. 2025, 25, 16212-16218.\
https://doi.org/10.1021/acs.nanolett.5c04324}