Application of singlet energy transfer in triplet state formation: broadband visible light-absorbing triplet photosensitizers, molecular structure design, related photophysics and applications

摘要: Conventional triplet photosensitizers usually contain a single visible light-harvesting chromophore, which is responsible for the dual-functionality of and intersystem crossing (ISC). These profiles have few disadvantages, such as absorption band in spectral range, low efficiency harvesting broadband light (e.g., solar light), difficulty designing new because relationship between molecular structure ISC unclear. To address these challenges, application Forster resonance energy transfer (FRET) spin converter can lead to motif attain light-absorption, well disintegrated functionality ISC. This Review article summarizes showing absorption, including design rationales, photophysical processes involved photosensitizers, FRET, ISC, photo-induced electron (PET), studied with nanosecond femtosecond transient spectroscopies. The photoredox catalytic organic reactions triplet–triplet annihilation upconversion are also discussed. We summarized structure–property challenges this emerging area.