Enhancing the efficiency of upconversion nanoparticles (UCNPs)
and therefore their brightness is the critical goal for this emerging
material to meet growing demands in many potential applications
including sensing, imaging, solar energy conversion and photonics.
The distribution of the photon sensitizer and activator ions that
form a network of energy transfer systems within each single
UCNP is vital for understanding and optimizing their optical properties.
Here we employ synchrotron-based X-ray Photoelectron
Spectroscopy (XPS) to characterize the depth distribution of Yb3+
sensitizer ions in host NaYF4 nanoparticles and systematically correlate
the structure with the optical properties for a range of
UCNPs with different sizes and doping concentrations. We find a
radial gradient distribution of Yb3+ from the core to the surface of
the NaYF4 nanoparticles, regardless of their size or the sensitizer’s
concentration. Energy dispersive X-ray Spectroscopy (EDX) was
also used to further confirm the distribution of the sensitizer ions
in the host matrix. These results have profound implications for the
upconversion optical property variations.