EXAFS analysis of blue luminescence in polyoxytungstate citrate gels | Zendy

De Buysser Klaartje | Zendy; Van Driessche Isabel | Zendy; Vermeir Pieter | Zendy; Thuy Tran Thi | Zendy; Schaubroeck Joseph | Zendy; Hoste Serge | Zendy

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EXAFS analysis of blue luminescence in polyoxytungstate citrate gels

Author(s) -

De Buysser Klaartje,

Van Driessche Isabel,

Vermeir Pieter,

Thuy Tran Thi,

Schaubroeck Joseph,

Hoste Serge

Publication year - 2008

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.200880255

Subject(s) - octahedron , luminescence , extended x ray absorption fine structure , chemistry , citric acid , ammonium , inorganic chemistry , tetrahedron , crystallography , materials science , absorption spectroscopy , crystal structure , optics , organic chemistry , physics , optoelectronics

Remarkable color changes can be seen when ammonium metatungstate – citric acid gels are submitted to sunlight. The colors strongly depend of the pH values of the precursor solution. Luminescence measurements reveal that gels at pH 7 exhibit a strong blue emission resulting from the presences of WO 4 2– tetrahedra while a slight green emission is due to WO 6 6– octahedra. The shift in equilibrium from octahedral to tetrahedral coordination upon increase in pH is confirmed by detailed EXAFS analysis. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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