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Microstructure of Eu 3+ ‐Doped Perovskites‐Type Niobate Ceramic La 3 Mg 2 NbO 9
Author(s) -
Qi Shuyun,
Wei Donglei,
Huang Yanlin,
Kim Sun Il,
Yu Young Moon,
Seo Hyo Jin
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12656
Subject(s) - photoluminescence , natural bond orbital , analytical chemistry (journal) , microstructure , ion , doping , crystallography , mineralogy , quenching (fluorescence) , ceramic , chemistry , materials science , fluorescence , physics , optics , molecule , metallurgy , optoelectronics , organic chemistry , chromatography
Eu 3+ ‐doped red‐emitting ceramics of Eu 3+ ‐doped La 3 Mg 2 NbO 9 were prepared via typical solid state. X‐ray diffraction and scanning electron microscope were utilized to characterize the ceramics. The photoluminescence excitation and emission spectra, the fluorescence decay curves, and color coordinates were investigated. The concentration quenching of the samples were discussed as well. The microstructures of the ceramics were discussed according to the spectral properties of probe ions of Eu 3+ , for example, substitution sites for Eu 3+ , inhomogeneous broadening and splitting of the emission bands, nonexponential decay, 5 D 0 → 7 F 0 emission transition, distorted symmetry sites, etc. The crystal structure of La 3 Mg 2 NbO 9 is heavily distorted due to the mixed occupation of Mg and Nb on B s ites. Eu 3+ ions only substitute La 3+ sites and Eu 3+ ions (or rare‐earth ions) are arranged in the heavily disordered environments over the whole structure in La 3 Mg 2 NbO 9 .