(5) Expectedly, a deep understanding of how the intensity is affected can be obtained through a dependency analysis among the three predefined variables, R F , R E and R D . For polar solvents (Figure ), the variation of R F is strongly and positively correlated with the variation of D , while it is only weakly and negatively correlated with R E . Besides, it is notable that polar solvents induce a strong enhancement of R D (or transition dipole moment, refer to Figure ) yet a slight decrease of R E (or vertical emission energy, E F ). Therefore, the intensity change in polar solvents mainly comes from the change of the transition dipole moment. In the case of F X (Figure ), R F is positively correlated with R E and negatively correlated with R D , and the effects of R E and R D offset each other, resulting in a negligible change of R F . Indeed, scrutiny of the transition dipole moment shows that R D is increased by negative F X fields yet decreased by positive F X fields (refer to Figure ), which cancels out the variation of R E . Notably, the variation of the transition dipole moment (or R D ) is much smaller under F X compared to polar solvents. In summary, the intensity enhancement in polar solvents mainly comes from the increase of the transition dipole moment, while the slight variation of intensity under F X originates from the mutual cancellation of the change of the vertical emission energy and the change of the transition dipole moment.