In this work, we have successfully developed a novel rigidized planar charge-transfer design strategy for triplet harvesting in purely organic molecules. Importantly, these co-planar ICT states are highly sensitive to subtle differences in the bonding pattern between the donor and acceptor fragments and therefore through judicious choice of the connecting bonds, charge- TADF emitters could be efficiently screened to identify high performing candidates. This will enable our planar rigidized charge-transfer design strategy to become a key focus for future molecular development for efficient triplet harvesting.