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(a) State energy diagram of the processes occurring in antenna-core two-photon-enhanced phosphorescent probes. EET, excitation energy transfer; ic, internal conversion; isc, intersystem crossing; ET, electron transfer; CR, charge recombination. See text for definition of all involved states. (b) Chromophores used in construction of probe PtTCHP-C307: coumarin-307 (C307) and PtTCHP (2, 3).
