As far as I know is the following, due to the electron transfer, the number of electrons in MoS2 reduces, which causes a decrease in the number of electron-hole combination during the PL excitation, which thereby reduces the Intensity.
Hello, maybe it will help. Citation from Wikipedia: "when an atom or molecule interacts with an electromagnetic wave of frequency ω , it can undergo a transition from an initial to a final state of energy difference ℏ ω through the coupling of the electromagnetic field to the transition dipole moment. When this transition is from a lower energy state to a higher energy state, this results in the absorption of a photon. A transition from a higher energy state to a lower energy state results in the emission of a photon." Have a nice day!
Graphene act as a metal-like electrode which enables electron transfer. In this case, excitons created by photonic irradiation will suffer non-radiative decay thus quenching the PL.
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