TADF Green Dopants
Green TADF dopants are organic molecules normally designed with electron-rich (donor) and electron-deficient (acceptor) moieties to achieve a small energy gap between singlet and triplet states. This structure facilitates efficient reverse intersystem crossing (RISC), allowing for a theoretical 100% internal quantum efficiency. They typically show emission wavelength of 510–550 nm with high external quantum efficiencies (EQE) from 20-40%.
Benchmark TADF green dopants are 4CzIPN as a "gold standard" green dopant frequently used as an assistant dopant in hyperfluorescence systems to improve efficiency roll-off and brightness. DACT-II is a bipolar emitter featuring diphenyltriazine (acceptor) and 3,6-diphenylaminocarbazole (donor) units. It achieves a maximum external quantum efficiency (EQE) of up to 31.7% and extremely low turn-on voltages (~2.22 V).
