Sharma, Aditya Varshney, Mayora Shin, Hyun-Joon Chae, KeunHwa Won, Sung Ok 2024-01-20T02:04:35Z 2024-01-20T02:04:35Z 2021-09-01 2017-02 1386-1425 https://pubs.kist.re.kr/handle/201004/123117 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 K alpha (lambda = 1.5418 angstrom) 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 e(g) and t(2g) orbitals, respectively, which ascribed to the local monoclinic structure for all of the samples. Eu M-5.4-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 (D-5(0)-F-7(0.2,4)) emission properties of Eu:HfO2 samples, The orange-red emission is ascribed to the Eu interstitial/surface segregation induced defects. (C) 2016 Published by Elsevier B.V. English Pergamon Press Ltd. XANES, EXAFS and photoluminescence investigations on the amorphous Eu:HfO2 Article 10.1016/j.saa.2016.10.006 1 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, v.173, pp.549 - 555 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 173 549 555 N scie scopus 000390502900076 2-s2.0-84993973230 Spectroscopy Spectroscopy Article RAY-ABSORPTION SPECTROSCOPY ELECTRONIC-STRUCTURE OPTICAL-PROPERTIES HFO2 NANOPARTICLES LUMINESCENCE L-3-EDGE POWDERS NEXAFS FILMS XRD XANES EXAFS HfO2 Photoluminescence