Currently, the major problem of most thermally activated delayed fluorescence (TADF) emitters is low rate of reverse intersystem crossing (rISC), a crucial process, responsible for conversion of dark triplet excitons into emissive singlet ones. One of the solutions to accelerate rISC is to increase spin-orbit coupling (SOC) between triplet and singlet states. It can be achieved by heavy-atom effect (HAE). Described here research is aimed to verify HAE concept for TADF materials through detailed experimental and DFT investigations conducted on blue and red/NIR derivatives of TADF emitters with high potential for application [1,2].
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