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Updated: Mar 12, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
XANES, EXAFS and photoluminescence investigations on the amorphous Eu:HfO2
Aditya Sharma1, Mayora Varshney1, Hyun-Joon Shin2
1Advanced Analysis Centre, Korea Institute of Science and Technology, Seoul 02792, South Korea.
Abstract:
We report detailed investigations on the local electronic/atomic structure and photoluminescence properties of chemically synthesized Eu:HfO2 powders. X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and photoluminescence (PL) measurements were performed to analyze the crystal structure, local atomic/electronic structure and luminescence properties of the samples. No crystalline phases were detected with Cu Kα (λ=1.5418Å) based XRD; however, local monoclinic structure was confirmed by the Hf L-edge XANES and EXAFS. O K-edge XANES spectral features could be deconvoluted with doublets and triplets in eg and t2g orbitals, respectively, which ascribed to the local monoclinic structure for all of the samples. Eu M5,4-edge XANES confirmed the pre-dominancy of Eu3+ ions in the HfO2 samples with a fractional amount of Eu2+ ions. PL spectra revealed the electric dipole allowed (5D0-7F0,2,4) emission properties of Eu:HfO2 samples. The orange-red emission is ascribed to the Eu interstitial/surface segregation induced defects.
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