Fig. 1: The mechanism of reported state-of-the-art photolytic reactions and the TTAP mechanism in this work.
From: Long wavelength single photon like driven photolysis via triplet triplet annihilation
a The reported mechanism of conventional photolytic mechanism. hv: single photon. b Pulsed two photon laser strategy mechanism for photolytic reaction. 2 hv: two photon. c The reported lanthanide ion-doped upconversion nanoparticles (UCNPs)-mediated photolytic reaction. LRET luminescence resonance energy transfer. d The mechanism of triplet–triplet annihilation-mediated photolysis (TTAP, this work). ISC intersystem crossing, TTET triplet–triplet energy transfer, TTA triplet–triplet annihilation, 1[Sen]* the singlet excited state of the photosensitizer, 3[Sen]* the triplet excited state of the photosensitizer, PPGs-X a photolytic molecule, PPGs photoremovable protecting groups (BDP, Py, An, and Cou), X targeted molecules (amino acids, anti-inflammatory drugs, anti-cancer drug, cholesterol), and photolabile linkage (ester bond, carbonate, carbamate). e Molecular structures of photosensitizers, including PtTNP, PdTPBP, PtOEP, and Ir(ppy)3. f Molecular structures of PPGs, including BDP, Py, An, and Cou moieties. g The normalized UV–vis absorption spectra of photosensitizers. h The normalized UV–vis absorption spectra of PPGs.
