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Upconversion(UC)has attracted much attention due to its potential applications in photocatalysis,photovoltaics,and molecular probes.1-3 For TTA(Triplet-Triplet Annihilation)upconversion,triplet sensitizers and acceptors are combined to harvest the irradiation energy and to acquire emission at higher energy through triplet-triplet energy transfer(TTET)and TTA processes.