“…[26][27][28][29] Several studies characterizing the CT ground state optical absorption as well as the steady-state and time-resolved photoluminescence of D-A co-crystals have been reported. 2,11,12,20,21,30,31 Also, studies using ultrafast transient diffuse reectance spectroscopy have been reported on a variety of co-crystal powders, including phenathrene 32 and methylated benzenes 33,34 co-crystallized with PMDA, and aromatic donors co-crystallized with tetracyanobenzene 35,36 and tetracyanoquinodimethane 37 acceptors. In addition, there have been several studies of exciton transport in polyacene single crystals of interest to singlet ssion.…”