Samarium-Activated La2Hf2O7 Nanoparticles as Multifunctional Phosphors

Gupta, Santosh K.; Abdou, Maya; Zuniga, Jose P.; Puretzky, Alexander A.; Mao, Yuanbing

doi:10.1021/acsomega.9b01318

Samarium-Activated La₂Hf₂O₇ Nanoparticles as Multifunctional Phosphors

Journal Article · Tue Oct 22 00:00:00 EDT 2019 · ACS Omega

DOI:https://doi.org/10.1021/acsomega.9b01318· OSTI ID:1785634

^[1]; Abdou, Maya ^[2]; Zuniga, Jose P. ^[2]; ^[3]; ^[4]

Univ. of Texas Rio Grande Valley, Edinburg, TX (United States); Bhabha Atomic Research Centre, Mumbai (India)
Univ. of Texas Rio Grande Valley, Edinburg, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Texas Rio Grande Valley, Edinburg, TX (United States); Illinois Inst. of Technology, Chicago, IL (United States)

Recent 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

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1785634

Alternate ID(s):: OSTI ID: 1994749

Journal Information:: ACS Omega, Journal Name: ACS Omega Journal Issue: 19 Vol. 4; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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