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Lanthanide Containing Ionic Liquid Crystals: EuBr 2 , SmBr 3 , TbBr 3 and DyBr 3 in C 12 mimBr
Author(s) -
Getsis Anna,
Mudring AnjaVerena
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000070
Subject(s) - luminescence , materials science , lanthanide , doping , ionic liquid , analytical chemistry (journal) , liquid crystal , differential scanning calorimetry , halide , crystallography , ion , inorganic chemistry , chemistry , optoelectronics , organic chemistry , physics , thermodynamics , catalysis
Doping the ionic liquid crystal C 12 mimBr with various lanthanide halides yields interesting novel liquid crystalline and luminescent materials. The thermal phase behavior of all compounds was investigated by hot‐stage polarizing optical microscopy and differential scanning calorimetry and the photophysical properties were determined by luminescence spectroscopy. C 12 mimBr itself is an ionic liquid crystal that shows bluish‐white emission upon excitation with UV light due to transitions in the imidazolium π‐system. Doping lanthanide bromides into C 12 mimBr with concentrations of about 1 mol‐% does not affect the liquid crystalline behavior of the host materials to a great extent and room temperature liquid crystals are obtained. All materials show an appreciable luminescence. EuBr 2 in C 12 mimBr yields a material, which shows a blue emission originating from 4f–5d‐transitions. SmBr 3 ‐doped samples show a red and TbBr 3 samples a green luminescence. Upon doping C 12 mimBr with DyBr 3 an orange luminescent liquid crystalline material is obtained. Most interestingly the emission color for the TbBr 3 and DyBr 3 containing materials can be tuned from bluish‐white (mainly C 12 mimBr emission) to green (for TbBr 3 ) and orange‐yellow (for DyBr 3 ) depending on the wavelength of the excitation light used.