Ionic liquids were used as solvents for dispersing luminescent lanthanide-doped LaF 3:Ln 3+ nanocrystals (Ln 3+ = Eu 3+ and Nd 3+ ). To increase the solubility of the inorganic nanoparticles in the ionic liquids, the nanocrystals were prepared with different stabilizing ligands, i.e., citrate, N, N, N -trimethylglycine (betaine), and lauryldimethylglycine (lauryl betaine). LaF 3:5%Ln 3+:betaine could successfully be dispersed in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide [C 4 mpyr][Tf 2 N], 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate [C 4 mpyr][TfO], and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C 4 mim][Tf 2 N] but only in limited amounts. Red photoluminescence was observed for the europium(III)-containing nanoparticles and near-infrared luminescence for the neodymium(III)-containing systems.
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Lunstroot et al. (2009) studied this question.
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