Detailed Impurity Phase Investigation by X-ray Absorption Fine Structure and Electron Spin Resonance Analyses in Synthesis of CaMgSi

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概要

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• Impurity phases of CaMgSi<inf>2</inf>O<inf>6</inf>:Eu (CMS) phosphor have been investigated in detail by X-ray absorption fine structure (XAFS), ESR, X-ray diffraction (XRD) and photoluminescence (PL) analyses. XRD studies of CMS phosphor powders clarify the volume fraction of CMS, Ca<inf>2</inf>MgSi<inf>2</inf>O<inf>7</inf>, (Ca,Eu)<inf>10</inf>(SiO<inf>4</inf>)<inf>6</inf>O<inf>2</inf>, and crystalline SiO<inf>2</inf>. XAFS and ESR studies clarify that the soluble limit of Eu ions in CMS crystals is observed at about 0.01 mol. Excess Eu ions yield an impurity (Ca,Eu)<inf>10</inf>(SiO<inf>4</inf>)<inf>6</inf>O<inf>2</inf>and some of them are captured by another impurity Ca<inf>2</inf>MgSi<inf>2</inf>O<inf>7</inf>. From the results of XAFS, ESR, XRD, and PL measurements, it was revealed that the PL peak intensities under 147 and 360 nm excitation correlate closely with the amount of these impurity phases containing divalent and trivalent Eu ions. Variation of X-ray absorption near edge structure and ESR spectra indicate that the optimum Eu concentration of the CMS phosphor is at approximately 0.01 molar versus Ca.

• 2013-04-25

著者

• Honma Tetsuo

  Japan Synchrotron Radiation Res. Inst. Hyogo Jpn

• Kunimoto Takashi

  Department of Electrical and Electronic Engineering, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori 680-8552, Japan

• Okubo Susumu

  Graduate School of Science, Kobe University, Kobe 657-8501, Japan

• Ohmi Koutoku

  Graduate School of Engineering, Tottori University, Tottori 680-8552, Japan

• Ohta Hitoshi

  Molecular Photoscience Research Center and Department of Physics, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan

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