Highly efficient deep-red (DR) organic materials in aggregated state are fundamentally restricted by the serious nonradiative decay rates (k_nr) due to the energy gap law, and the aggregation induced quenching in view of significant intermolecular interaction. Here, two new BODIPY chromophores owning donor−acceptor−donor (D−A−D) structure, namely CF₃-2TPA and 2CF₃-2TPA, were designed and synthesized. Trifluoromethyl (CF₃)-substituted phenyl group was introduced to the meso-position of the BODIPY core, tuning red to DR emission and suppressing intermolecular interaction with the utilization of the steric hindrance of CF₃. Besides, CF₃-2TPA and 2CF₃-2TPA show enhanced aggregation-induced emission (AIE) characteristic, which was ascribed to the CF₃ rotor dissipating the excited-state energy. The OLEDs are fabricated by combining a thermally assisted delayed fluorescence host with a deep-red dye, showing a DR cut-on wavelength of 668 nm and external quantum efficiency of 2.3%. This work provided a rotor strategy to convert BODIPY molecule with obvious AIE property, providing their promising applications in DR-OLEDs.

聚集态的高效深红色 (DR) 有机材料从根本上受到由于能隙定律导致的严重非辐射衰减率 (k _{nr ) 以及由于显着的分子间相互作用而引起的聚集猝灭的限制。}在这里，设计和合成了两种具有供体-受体-供体（D-A-D）结构的新型 BODIPY 发色团，即 CF ₃ -2TPA 和 2CF ₃ -2TPA。将三氟甲基 (CF ₃ ) 取代的苯基引入 BODIPY 核心的中间位置，利用 CF ₃的空间位阻将红色调到 DR 发射并抑制分子间相互作用。此外，CF ₃ -2TPA 和 2CF ₃-2TPA 显示出增强的聚集诱导发射 (AIE) 特性，这归因于 CF ₃转子耗散了激发态能量。OLED 是通过将热辅助延迟荧光主体与深红色染料相结合制成的，其 DR 截止波长为 668 nm，外部量子效率为 2.3%。这项工作提供了一种转子策略来转化具有明显 AIE 特性的 BODIPY 分子，为其在 DR-OLED 中的应用提供了广阔的前景。