ao9b01318_si_001.pdf (1.32 MB)
Samarium-Activated La2Hf2O7 Nanoparticles as Multifunctional Phosphors
journal contribution
posted on 2019-10-22, 12:38 authored by Santosh
K. Gupta, Maya Abdou, Jose P. Zuniga, Alexander A. Puretzky, Yuanbing MaoRecent
developments in the field of designing novel nanostructures
with various functionalities have pushed the scientific world to design
and develop high-quality nanomaterials with multifunctional applications.
Here, we propose a new kind of doped metal oxide pyrochlore nanostructure
for solid-state phosphor, X-ray scintillator, and optical thermometry.
The developed samarium-activated La2Hf2O7 (LHOS) nanoparticles (NPs) emit a narrow and stable red emission
with lower color temperature and adequate critical distance under
near-UV and X-ray excitations. When the LHOS NPs are exposed to an
energetic X-ray beam, the Sm3+ ions situated at the symmetric
environment get excited along with those located at the asymmetric
environment, which results in a low asymmetry ratio of Sm3+ under radioluminescence compared to photoluminescence. High activation
energy and adequate thermal sensitivity of the LHOS NPs highlight
their potential as a thermal sensor. Our results indicate that these
Sm3+-activated La2Hf2O7 NPs can serve as a multifunctional UV, X-ray, and thermographic
phosphor.