Optical properties and local structure of Eu3+-doped synthetic analogue of the microporous titanosilicate mineral sitinakite


The synthetic analogue of the microporous titanosilicate mineral sitinakite has been hydrothermally synthesized and used as a host in the preparation of a new photoluminescent material. The inclusion of Eu3+ in the pores of the sitinakite doubles the unit cell volume and changes the symmetry of the initial sodium phase. The Eu3+-doped material displays a stable room temperature emission ascribed to the Eu3+ intra-4f(6) D-5(0) -> F-7(0-4) transitions, with a maximum external quantum yield of 6%. The observation of two components for the nondegenerated D-5(0) -> F-7(0) transition, the local field splitting of the D-5(o) -> F-7(1-2) transitions, and the D-5(0) emission decay curves point out the presence of two optically active Eu3+ sites. Possible structural distribution of the detected Eu3+ cations is discussed. (c) 2007 Elsevier B.V. All rights reserved.



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Ferdov, S; Ferreira, RAS; Lin, Z

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