Switch of the magnetic field effect on photon upconversion based on sensitized triplet–triplet annihilation†
Abstract
Magnetic field effects (MFEs) on photon upconversion based on sensitized triplet–triplet annihilation (TTA-UC) are examined in platinum(II) octaethylporphyrin/9,10-diphenylanthracene (DPA) systems at different DPA concentrations and laser power densities. Positive MFEs on TTA-UC are observed for the first time and are most likely attributable to aggregation of DPA.