Photoluminescence studies on europium-based scorpionate-complex

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Abstract

The neutral homoleptic europium(III) complex Eu(Tp)3 (Tp = hydrotris(pyrazol-1-yl)borate) showed luminescence associated to f–f transitions if irradiated with near-ultraviolet radiation having wavelength lower than 380 nm. In this species the most intense emission corresponds to the 5D0  7 F4 transition, falling between 690 and 700 nm. The complex is stable towards oxygen, moisture and near-UV light. The energy levels of the coordinated ligands involved in the photoluminescence process were computed by applying computational methods and by carrying out luminescence measurements on the analogous Gd(III) complex.

Graphical abstract

The Eu(III) complex Eu(Tp)3 (Tp = hydrotris(pyrazol-1-yl)borate) gives a metal-centred red emission associated to the 5D0  7FJ transitions if irradiated with near-ultraviolet light. This species is stable towards oxygen, moisture and UV light. The energy levels involved in the photoluminescence have been experimentally and theoretically investigated.

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Highlights

► Eu(Tp)3 (Tp = hydrotris(pyrazol-1-yl)borate) is photoluminescent. ► The most intense emission corresponds to the 5D0  7 F4f–f transition. ► The emission is caused by the absorption of near-UV radiation. ► The photostability of Eu(Tp)3 is good. ► Gd(Tp)3 emits in the blue-green region. ► The energy levels connected to luminescence have been investigated.

Section snippets

Communication

The promising photoluminescent properties of several lanthanide (Ln3+) ions make the synthesis of novel lanthanide complexes one current field of research in coordination chemistry. The major advantages of lanthanide complexes as luminescent species are the long emission lifetimes, narrow bandwidths and large Stokes shifts [1]. Moreover, the studies on lanthanide photoluminescence have been prompted in these last few years by the publication of lanthanide-based photoluminescent inorganic

Acknowledgements

Financial support was provided by the Ca' Foscari University of Venice (Ateneo Fund 2009) and by the Italian Minister for Economic Development (MISE-ISE-CRUI 2009 project n. 90). We acknowledge the CINECA Award N. HP10CI3CHF, 2010 for the availability of high performance computing resources and support.

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