Funct. Mater. 2020; 27 4: 675-680.
Optical-luminescent properties of liquid crystal systems with dispersed cerium oxide nanoparticles
Institute for Scintillation Materials, STC Institute for Single Crystals National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine
It is shown that suspensions of cerium oxide nanoparticles in the nematic 5CB phase undergo nonmonotonic changes in optical density with an increase in CeO2 concentration with maximum transmission noted at a level of ~ 0.03 wt.%. With a further increase in the CeO2 content above this threshold, as well as in the entire concentration range in the isotropic phase, the optical density increased as it could be expected. The luminescence of cerium oxide nanoparticles was of low intensity and was almost completely overlapped by the 5CB luminescence band. However, with other liquid crystal matrices, clear CeO2 luminescence bands were observed at ~ 330 nm under excitation at ~ 270 nm for three samples of nanoparticles of different sizes and different manufacturers.
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