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Nowadays,purely organic materials with delayed fluorescence(DF)are being enthusiastically developed and extensively utilized as light-emitting materials to fabricate OLEDs because of their high exciton utilization and metal-free nature.These DF materials usually have a small single-triplet splitting(ΔEST),and the nonradiative triplet excitons(75%)can be converted into radiative singlet excitons via thermally
Nowadays, purely organic materials with delayed fluorescence (DF) are being enerstically developed and extensively utilized as light-emitting materials to fabricate OLEDs because of their high exciton utilization and metal-free nature. These DF materials usually have a small single-triplet splitting ( ΔEST), and the nonradiative triplet excitons (75%) can be converted into radiative singlet excitons via thermally