Fig. 2: Quantum-chemical calculations.
From: Highly efficient luminescence from space-confined charge-transfer emitters

a, The distribution of the HOMOs and LUMOs and the analysis for the distribution of the hole (blue) and electron (purple) for S1 and T1. b, The contribution ratio (η) for the electron transition from donor to linker, donor to acceptor and linker to acceptor at the S1 excited state.