The photoluminescence (PL) and Raman spectra of molybdenum disulfide (MoS) can be tuned with liquid crystals. A nematic liquid crystal, 5CB, was aligned in a zigzag direction on an MoS monolayer flake. The PL and A Raman mode peaks of the MoS monolayer were shifted by 46 meV and 2 cm, respectively, owing to the interaction between MoS and the liquid crystal. Based on Lorentzian fitting analysis, it was confirmed that the peak positions and intensity ratios of the trion PL and exciton PL varied with the phase transition of the liquid crystal. This phenomenon was possibly caused by the transfer of electrons from MoS to the liquid crystal. This electron transfer varies with the temperature-dependent change in the liquid crystal phase. Therefore, the PL spectra of MoS can be tuned simply by controlling the phase, without changing the type of added material.
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