| 초록 |
Triplet photosensitizers which are well known for efficiently producing triplet states are versatile compounds. So they have been widely used in photocatalysis, photodynamic therapy, and triplet-triplet annihilation upconversion. To generate a triplet state, one of the most critical photophysical processes is intersystem crossing(ISC). Typical approaches for the ISC are heavy atom effect, donor-acceptor structure, exciton coupling. Among these ways, although the heavy atom effect is the most prominent, due to its dark toxicity, there has been a concern for biological application. In this study, heavy atom-free photosensitizers were synthesized by introducing a stable free radical which can control spin multiplicity. The findings showed enhanced ISC efficiency comparing with a heavy atom substituted photosensitizer. Furthermore, for the modification of optical properties, linkers were introduced. |
