A novel low-powered upconversion strategy to enhance the anti-Stokes shift: cascading one-photon hot-band absorption and triplet sensitization based on Pd(ii)octaethylporphyrin

Cascading hot-band OPA and triplet–triplet annihilation upconversion (TTA-UC) were shown to provide a novel low-powered upconversion approach with a larger anti-Stokes shift in a simple way.