Generally, E0,0 decreases with increasing solvent polarity (Figure ), reflecting the positive solvatochromism exhibited by many of the PCs in this study. For example, the E0,0 The ET measurements for TADF compounds are typically obtained from the gated emission spectra at 77 K; however, at this low temperature the solvent forms a glass. In the glass, there is no opportunity for solvent reorganization and thus, the measurements at 77 K do not capture any reorganization of the solvent dipoles that would be responsible for the stabilization of the CT states. We nonetheless measured the gated emission spectra of [Cu(dmp)(xantphos)]PF6