Influence of Uncoordinated Anion-Radical TCNQ∸ on the Photo- and Electroluminescence Properties of Eu3+ and Tb3+ Tris(Pyrazolyl)Borate Complexes
- 108 Downloads
Complexes of Eu3+ and Tb3+ with tris(3-(2-pyridyl)pyrazolyl)borate (TpPy–) of composition [Tp 2 Py Ln]Tp Py and [Tp 2 Py Ln]TCNQ · show metal-centered luminescence even in the presence of efficient luminescence quencher such as TCNQ∸ as the counter-ion. The electroluminescence spectrum of an ITO/PVK/[Tp 2 Py Tb]TpPy/Al (PVK = poly(9-vinyl)carbazole) device showed Tb3+ emission. When [Tp 2 Py Ln]TCNQ · is used as the emitting layers presumably the emission of separate carbazole fragments of PVK was observed, which may be due to a breakdown in packing of the carbazole fragments upon the inclusion into stacks of the TCNQ∸ anion-radicals. Very weak emission of the Tb3+ ion was detected in the LED with the [Tp 2 Py Ln]TCNQ · complex.
Key wordslanthanide complexes tris(pyrazolyl)borate anion-radical TCNQ∸ photoluminescence electroluminescence
- 7.G. M. Davies, R. J. Aarons, G. R. Motson, et al., Dalton Trans., 1136 (2004).Google Scholar
- 10.R. Demirbilek, J. Heber, and S. I. Nikitin, Proc. SPIE, XI Feofilov Symp. on the Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, 4766, 47 (2012).Google Scholar
- 20.V. M. Zolotarev, Methods for the Investigation of Photonic Materials: Elements of Theory and Technology [in Russian], St. Petersburg State University, University of Information Technologies, Mechanics and Optics, St. Petersburg (2008).Google Scholar