Anna Getsis and Anja-Verena Mudring, Ruhr-University Bochum, Germany, have shown that the ionic liquids [C12mim]3Br and [C12mpyr]Br, both doped with TbBr3, as well as the neat compounds [C12mim]3[TbBr6] and [C12mpyr]3[TbBr6], are interesting new materials.
These ionic liquids form liquid crystalline mesophases over a wide temperature range and the imidazolium compounds showed a strong green luminescence. The color of the emission could be switched between green and blue-white depending on the excitation energy used.
These materials are of interest for liquid crystal displays due to their color-switching abilities. Additionally, the inclusion of the Tb3+ ion introduces magnetic anisotropy which could make alignment of the mesophase in an external magnetic field possible leading to electrically and magnetically switchable devices.
- Switchable Green and White Luminescence in Terbium-Based Ionic Liquid Crystals
A. Getsis, A.-V. Mudring,
Eur. J. Inorg. Chem. 2011.