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We demonstrated experimentally and theoretically that in the organic photovoltaic blends with fluorinated non-fullerene acceptors,the triplet loss channel of free charges can be efficiently suppressed by introducing fluorine substituents to the terminal acceptor unit of fluorinated non-fullerene acceptors.1 The downshifting of interfacial triplet excited states by fluorination plays the pivotal role in the suppressing of triplet exciton formation.Fluorination may change multiple factors including the morphology,the dielectric constant,and the energy level alignment.