The luminescence properties of three tetrakis dibenzoylmethane europium(III) complexes with different counter ions

被引：0
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作者：
Mech, Agnieszka [1 ]
Karbowiak, Miroslaw [2 ]
Görller-Walrand, Christiane [3 ]
Van Deun, Rik [3 ]
机构：
[1] Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland
[2] Faculty of Chemistry, University of Wroclaw, ul. F. Joliot-Curie, 50-238 Wroclaw, Poland
[3] Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200F, B-3001 Leuven, Belgium
来源：
Journal of Alloys and Compounds | 1600年 / 451卷 / 1-2期
关键词：
We report the synthesis and emission properties of some europium compounds; which are highly luminescent under UV excitation; formed by the tetrakis complex anion of [Eu(dbm)4]- type with three different counter cations: N(C2H5)4+; P(C6H5)4+ and As(C6H5)4+. For (N(C2H5)4)[Eu(dbm)4; only one Eu3+ site; site; (a); was observed with an emission lifetime of 0.301 ms and an evaluated quantum efficiency of 27.0% at 77 K. The presence of the P(C6H5)4+ or As(C6H5)4+ cations in the salts causes a decrease of the lifetime and the quantum efficiency of the Eu3+ ions occupying the site (a). Moreover; steric effects resulting from the incorporation of the larger counter ions into a crystal structure lead to a formation of another site; in which Eu3+ ions have significantly longer lifetimes and higher quantum efficiencies compared to the site (a); equal to 0.829 ms and 41% for (P(C6H5)4)[Eu(dbm)4; and 0.815 ms and 35% for (As(C6H5)4)[Eu(dbm)4; respectively. © 2007 Elsevier B.V. All rights reserved;
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页码：215 / 219
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