Journal
OPTICAL MATERIALS
Volume 36, Issue 10, Pages 1709-1714Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2014.02.001
Keywords
Niobate; Perovskite; Crystal structure; Luminescence
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Funding
- SUPERLUMI station at HASYLAB (DESY) in Hamburg [I-20110592]
- State Fund for Fundamental Researches of Ukraine [F54.1/040]
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The A(3)(II)LaNb(3)O(12) (A(II) = Ba, Sr) layered perovskites were synthesized by co-precipitation method. Luminescence properties of these compositions have been investigated for the first time. Emission spectra consist of wide bands with maxima located near 430 and 500 nm. Luminescence processes are discussed in connection with features of cation compositions, crystal structure and distortions of the NbO67- groups' symmetry. Possible scheme of electron states and the lowest allowed electron transitions has been built for the niobate groups of O-h and C-3V symmetry. In this scheme, the 430 and 500 nm emission bands were assigned to T-1 -> A(1) and E -> A(1) electron transitions in the perfect and distorted NbO67- oxyanions, respectively. (C) 2014 Elsevier B.V. All rights reserved.
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