All global double hybrids outperform the (range-separated and global) hybrids tested in our previous study, consistent with benchmarking studies showing more robust excitation energies and absorption spectra and their ability to correctly capture exciton coupling.[126] PBE-QIDH-a T A B L E 2 Dissociation energies (D e in kcal/mol) and equilibrium distances (r e in Å) for each of the four excimers across the 22 dispersion-uncorrected double hybrids, SCS-CC2/CBS "non-empirical" PBE-based exchange-correlation functionalpredicts a stronger binding and is closer to the reference than the BLYP-based double hybrids tested, for example 0.32 kcal/mol deviation in D e compared to 1.70 kcal/mol for B2GP-PLYP [Figure and]. This mirrors a well-established trend in ground-state studies where PBE is more attractive than BLYP for NCIs, and the behaviour of PBE-and BLYP-based global hybrids in our previous excimer binding study. It is also worth considering the stronger excimer binding of PBE-QIDH follows a larger component of Fock exchange (69%) than the BLYP based functionals (53 and 65%), parallel to the trend for global hybrids. While all global double hybrids fail to correctly capture CT excitations, including PBE-QIDH,[128, 129] large portions of Fock exchange can induce a blueshift that is strong enough to seemingly give better CT excitation energies. The relative importance of CT for benzene excimer binding, compared to smaller dispersion and exciton coupling contributions than larger excimers, may explain the improved performance of PBE-QIDH compared to B2PLYP and B2GP-PLYP. Furthermore, range-separated double hybrids yield smaller average errors in r e than global hybrids demonstrating their competitive ability to capture CT. For unscaled functionals, range-separated BLYP-based double hybrids are closer to the reference than the PBE-based ones, with ωB2GP-PLYP and RSX-QIDH yielding deviations in D e of 0.01 and 0.83 kcal/mol, respectively [Figure and]. ωB2GP-PLYP additionally outperforms PBE-QIDH more consistently across all intermolecular distances, demonstrating the superiority of range separation over high portions of Fock exchange in double hybrids where CT character is prominent.