“…͑5͒ ͑Refs. 68 and 69͒ and ͑6͒, respectively, where E͑S 1 ͒ is the energy level of the lowest excited singlet state of EtCz, E ox D and E red A oxidation potential of donor ͑Cz͒ and reduction potential of acceptor ͑A͒, respectively, e the elementary charge, 0 the vacuum permittivity, S static dielectric constant of the matrix, r DA separation distance between the donor and acceptor, r D and r A spherical radii of donor and acceptor moieties, respectively, 53 and ϱ optical dielectric constant of the matrix which is equal to the squire of the refractive index of the matrix n 2 ,…”