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.

Automated summary

The temperature and viscosity dependences of polarized luminescence of colloidal solutions of MoS2 nanodots in organic solvents were investigated. The ensemble of MoS2 nanodots behaves as a system of linear oscillators under linearly polarized excitation, where the initial orientation is disrupted by the Brownian rotation of the nanodots. The sizes of luminescent nanodots, which change with the radiation wavelength, were estimated within the framework of the Levshin-Perrin model, and the results were consistent with the estimates based on quantum size effect. It was found that the polarization features of radiative transitions in MoS2 nanodots differ from those in MoS2 monolayers.