XANES, EXAFS and photoluminescence investigations on the amorphous Eu:HfO2

被引：34

作者：

Sharma, Aditya ^{[1
]}

Varshney, Mayora ^{[1
]}

Shin, Hyun-Joon ^{[2
]}

Chae, KeunHwa ^{[1
]}

Won, Sung Ok ^{[1
]}

机构：

[1] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 02792, South Korea

[2] POSTECH, Pohang Accelerator Lab, Pohang 37673, South Korea

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2017年 / 173卷

基金：

新加坡国家研究基金会;

关键词：

XRD; XANES; EXAFS; HfO2; Photoluminescence; RAY-ABSORPTION SPECTROSCOPY; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; HFO2; NANOPARTICLES; LUMINESCENCE; L-3-EDGE; POWDERS; NEXAFS; FILMS;

D O I：

10.1016/j.saa.2016.10.006

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

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.

引用

页码：549 / 555

页数：7

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