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TAA-UCNP co-loaded with PdOEP and DPA. Schematic illustration of TAA-UCNP, the chemical structure of PdOEP (sensitizer) and DPA (annihilator). The chelation of palladium (Pd) enhanced the phosphorescence of porphyrin molecules and thus it has the potential to be used as a triplet photosensitizer for upconversion. Permission obtained from Ref.[135]. Copyright (2012) by American Chemical Society.
