LAUSR

Abstract We have investigated the static and dynamic photoluminescence (PL) of monolayer molybdenum disulfide (MoS2) from low-temperature (4 K) to room temperature (300 K). Free excitons (A excitons) and bound excitons (XL excitons) can be seen in the low-temperature PL spectra. The radiative rates and nonradiative rates of the two kinds of excitons as a function of temperature can be calculated through the parameters derived from the PL and time-resolved PL spectra. As the temperature increases, the observed phenomena, including the red-shift of the center wavelength of the PL spectrum, the decrease of the PL intensity, and the shorter of the relaxation time, all can be explained by the temperature-dependence of the band structure of MoS2 and the temperature-dependence of the nonradiation process. The radiation process originates from excitons recombination in monolayer MoS2. The nonradiation process is due to defect trapping and thermal energy generation. The temperature-dependence of the radiation and nonradiation processes significantly affects the optical properties of the monolayer MoS2.