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Optical Properties of Ce-Doped Li4SrCa(SiO4)2: A Combined Experimental and Theoretical Study

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MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
Anhui Province Key Laboratory of Optoelectric Materials Science and Technology, Department of Physics, Anhui Normal University, Wuhu, Anhui 241000, China
§ Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
*E-mail: [email protected] (L.N.).
*E-mail: [email protected] (H.L.).
Cite this: Inorg. Chem. 2018, 57, 3, 1116–1124
Publication Date (Web):January 5, 2018
https://doi.org/10.1021/acs.inorgchem.7b02561
Copyright © 2018 American Chemical Society

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    Abstract

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    Investigation of optical properties of Ce3+-activated phosphors is not only of practical importance for various applications but also of fundamental importance for providing a basis to understand relevant properties of other lanthanide ions in the same host. We report herein a combined experimental and theoretical study of optical properties of Ce3+ in Li4SrCa(SiO4)2. Photoluminescence properties of the material prepared by a solid-state reaction method are investigated with excitation energies in the vacuum-ultraviolet (VUV) to ultraviolet (UV) range at low temperatures. The band maxima in the excitation spectra are assigned with respect to 4f → 5d transitions of Ce3+ at the Sr and Ca sites, from comparison between experimental and ab initio predicted transition energies. As a result of the two-site occupation, the material displays luminescence at 300–500 nm with a high thermal quenching temperature (>500 K), consistent with the calculated large gaps (∼1.40 eV) between the emitting 5d levels and the bottom of the host conduction band. On the basis of experimental and calculated results for Ce3+ in Li4SrCa(SiO4)2, the energy-level diagram for the 4f ground states and the lowest 5d states of all trivalent and divalent lanthanide ions at the Sr and Ca sites of the same host is constructed and discussed in association with experimental findings.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.inorgchem.7b02561.

    • Refined lattice and atomic parameters (Table S1) and Sr–O and Ca–O bond lengths (Table S2) for LSCSO, calculated 4f1 and 5d1 energy levels (Table S3), Ce-L3 edge XANES spectra (Figure S1) and VUV-UV excitation spectra (Figure S2) for LSCSO:Ce, excitation and emission spectra of LSCSO:Eu3+ (Figure S3) (PDF)

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