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- W2035535451 abstract "The photoluminescence properties of the Eu3+ ion doped into α-cordierite were studied based on the excitation and emission spectra and lifetime measurements. These samples were prepared by the sol–gel method and calcined by heating the xerogel at different temperatures: 873, 1133, 1223 and 1473 K. X-ray diffraction patterns were used to characterize the luminescent material. The 5D0→7F0 transition of the samples exhibits only one broad peak arising from the inhomogeneous linewidth of the amorphous phase, except for the ceramic material obtained at 1473 K that presents two peaks. Also, in the latter case the luminescence decay lifetime exhibits a bi-exponential fit when excited at 280 nm, corroborating that the Eu3+ ion exists in two sites of symmetry. The experimental intensity parameter Ω2 (10.0×10−20 cm2) indicates a moderately polarizable chemical environment around the Eu3+ ion. The emission spectra of the Mg2Al4Si5O18:Eu3+ samples calcined at 873, 1133 and 1223 K also presented inhomogeneous profiles for the 5D0→7FJ transitions suggesting disorder of the material. On the other hand, the sample calcined at 1473 K shows narrow bands indicating the crystalline form. The emission quantum efficiency (η) of the α-cordierite system is also discussed." @default.
- W2035535451 created "2016-06-24" @default.
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- W2035535451 date "2003-02-01" @default.
- W2035535451 modified "2023-10-17" @default.
- W2035535451 title "Preparation and optical properties of trivalent europium doped into cordierite using the sol–gel process" @default.
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- W2035535451 doi "https://doi.org/10.1016/s0022-4596(02)00216-5" @default.
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