Blazevicius Dovydas, Krucaite Gintare, Bogoslovska Alla, Grigalevicius Saulius, Ali Amjad, Ågren Hans, Baryshnikov Glib, Dimitriev Oleg
Department of Polymer Chemistry and Technology, Kaunas University of Technology Radvilenu Plentas 19 Kaunas LT50254 Lithuania.
V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine Pr. Nauki 41 Kyiv 03028 Ukraine
RSC Adv. 2025 Jun 3;15(23):18559-18565. doi: 10.1039/d5ra02848e. eCollection 2025 May 29.
Complex donor arms in thermally-activated delay fluorescence (TADF) molecules can potentially provide additional options for charge-transfer (CT) emission through higher twisting disorder, leading to broader emission spectra. Here we design novel TADF emitters with double twisted donor moieties and show that a structural complication of the carbazole-based donor arms by changing the molecular structure from D-A-D to D-D-A-D-D yields a transition from a dual to a triple emission band with an additional CT emission component, providing a corresponding red shift and increasing low-energy emission contribution. The revealed relationship between increased complexity of the donor moiety and the multicomponent CT emission band in the D-A-D structures provides a clue for design of TADF emitters with extended emission spectra.
热激活延迟荧光（TADF）分子中的复杂供体臂可通过更高的扭曲无序性为电荷转移（CT）发射提供更多选择，从而产生更宽的发射光谱。在此，我们设计了具有双扭曲供体部分的新型TADF发射体，并表明通过将分子结构从D-A-D变为D-D-A-D-D，咔唑基供体臂的结构复杂性会导致从双发射带转变为三发射带，并带有额外的CT发射成分，从而产生相应的红移并增加低能量发射贡献。在D-A-D结构中揭示的供体部分复杂性增加与多组分CT发射带之间的关系为设计具有扩展发射光谱的TADF发射体提供了线索。
