The off-diagonal elements in Figure represent dimers formed by two monomers with differing fluorescence energies. In these cases, the dimer's oscillator strength tends to follow that of the monomer with the lower E 5% , which is consistent with the oscillator strength distribution illustrated in Figure . Regarding the close-diagonal region where the two monomers have similar E 5% , the fluorescence of dimers is mostly suppressed, with 28 out of 31 homogeneous dimers having zero oscillator strength regardless of the brightness of their .