Thermally induced depolarization of fluorescence of matrix-isolated MoS2 nanodots

The temperature and viscosity dependences of polarized luminescence of colloidal solutions of MoS₂ nanodots in organic solvents have been studied. It is shown that under conditions of linearly polarized excitation, an ensemble of  MoS₂ nanodots behaves as a system of linear oscillators, the initial orientation of which is violated due to the Brownian rotation of the nanodots. Within the framework of the Levshin-Perrin model, the sizes of luminescent nanodots,  which vary with the radiation wavelength, are estimated. The data obtained are in agreement with the estimates of the nanodot sizes based on the quantum size effect. It is shown that the polarization features of radiative transitions in  MoS₂ nanodots differ from the properties of radiative transitions in MoS₂ monolayers.