The mechanism of heavy-atom effect on organic blue TADF emitters is investigated using a combined Arrhenius and Marcus theories approach. Basic molecular design principles of such hybrid organic TADF materials are formulated.

A heavy-atom field effect (HAFE) is discovered in red TADF emitters bearing Br atoms in donor fragment. Depending on the position of heavy atoms, HAFE can either accelerate or inhibit reverse intersystem crossing.

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