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- W2324144098 abstract "The crystal structure of β-Ca3SiO4Cl2 was determined by the ab initio structure determination method based on the synchrotron powder XRD data for the first time, and the luminescence properties of a Eu2+-doped β-Ca3SiO4Cl2 phosphor were characterized. β-Ca3SiO4Cl2 was found to be monoclinic (space group P21/c) with the lattice parameters, a = 5.91234(1) Å, b = 10.20128(1) Å, c = 10.98866(1) Å, β = 90.3423(1)°. This structure can be considered as an intergrowth structure built up from alternating stacks of two layered sublattices, ∞2[Ca2SiO4] and ∞2[CaCl2], along the [100] direction. In this structure, the Ca atoms occupy three crystallographically distinct sites: Ca1O4Cl3, Ca2O5Cl2, and Ca3O3Cl4. The photoluminescence of the Eu2+-doped Ca3SiO4Cl2 phosphor excited at 450 nm blue light shows the 150 nm wide-band emission peaked at 635 nm with about 70% quantum efficiency. The photoluminescence properties, such as centroid shifts, crystal-field splitting, and Stokes shifts, were correlated with the crystal structure through the calculation of shared-electron populations reflecting the bond covalency between Ca and O/Cl. Effects of doping concentrations on the luminescence spectra and temperature stability were also discussed based on the inhomogeneous energy transfer property determined by the structural geometric factor." @default.
- W2324144098 created "2016-06-24" @default.
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- W2324144098 date "2014-05-28" @default.
- W2324144098 modified "2023-10-12" @default.
- W2324144098 title "Interplay between Crystal Structure and Photoluminescence Properties of β-Ca<sub>3</sub>SiO<sub>4</sub>Cl<sub>2</sub>:Eu<sup>2+</sup>" @default.
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- W2324144098 doi "https://doi.org/10.1021/jp5002379" @default.
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