In situ Generation of Carbazole-triazine Thermally Activated Delayed Fluoresscence Emitters within the Conjugated Polymer Chain

https://doi.org/10.1007/s10118-025-3516-2

The development of polymeric materials that exhibit blue thermally activated delayed fluorescence (TADF)0 is of great interest for optoelectronic applications. However, achieving TADF in polymers often requires an elaborate monomer design. The high-energy local triplet state (³LE) of carbazole complicates its application despite the molecular orbital arrangement being suitable for blue emission. Here, we present an approach to polymer design that makes it possible to solve this problem. We demonstrate the in situ formation of a TADF donor-acceptor system during Suzuki polycondensation, creating an extended carbazole-based donor matrix coupled00 with a triazine acceptor. The resulting polymer exhibited efficient TADF with a low energy gap (ΔE_ST) value if a phenyl N-substituent, enabling essential electron delocalization, was present in the carbazole moiety. This work establishes a versatile platform for developing carbazole-based TADF polymers, overcoming the fundamental limitations that hinder their widespre