Enhanced triplet-triplet annihilation upconversion by photonic crystals and Au plasma resonance for efficient photocatalysis
Strong upconversion luminescence is significant for effective photocatalytic technology. In this work, photonic crystals and Au nanoparticles (AuNPs) are introduced together to enhance triplet-triplet annihilation upconversion (TTA-UC) luminescence intensity. Photonic crystal films have been fabricated by demolding polydimethylsiloxane film containing platinum (II)-octaethylporphyrin & 9,10-diphenylanthracene and AuNPs from V-shape anodic aluminum oxide templates. The enhancement factor of 3.69-fold has been obtained for the blue light intensity of photonic crystal film without AuNPs under green light excitation. After coupling photonic crystal structure with AuNPs plasma resonance, the green-to-blue TTA-UC intensity of the composite film has been enhanced by 7.68 times as compared with planar upconversion film without AuNPs. The Pseudo-first-order rate constant of the composite film system with g-C3N4@CdS has been increased by 3.88 times compared with that of planar upconversion film system without AuNPs under visible light. This work presents a new route to enhance the TTA-UC luminescence via a hybrid effect, which is useful for photocatalysis.