Zinc(II) tetraphenyltetrabenzoporphyrin complex as triplet photosensitizer for triplet-triplet annihilation upconversion

Zn(II) tetraphenyltetrabenzoporphyrin (TPTBP) and the free base H2TPTBP were used as triplet photosensitizers for triplet-triplet annihilation (TTA) upconversion, to replace the long-established precious metal complex triplet photosensitizers such as those containing Pd(II)-Pt(II) atoms.