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Triplet FusionTriplet–triplet annihilation upconversion (TTA-UC) has emerged as a compelling strategy for converting low-energy, incoherent visible light into high-energy photons for photochemistry—circumventing the need for harsh irradiation conditions. Yet the field faces persistent bottlenecks: optimization of TTA-UC systems remains challenging due to the need for precise tuning of sensitizer and annihilator concentrations, reabsorption of upconverted photons by annihilator molecules further limits output, and translation from model materials to productive synthetic photochemistry remains largely unrealized. Our group is interested in upconversion by triplet fusion as a general photochemistry platform—an unconventional, multiexciton strategy whose transformative potential for chemical synthesis is rapidly gaining momentum.
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