Hybridized Multi‐Spiral Donor Engineering for High‐Efficiency Narrowband Thermally Activated Delayed Fluorescence Emitters

作者：Yu‐Tao Yang, Yi‐Cheng Zhao, Hao‐Ze Li, Feng‐Ming Xie, Yanqing Li, Jianxin Tang · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202518014 · 被引用次数：4 · 研究领域：Organic Light-Emitting Diodes Research、Luminescence and Fluorescent Materials、Organic Electronics and Photovoltaics

The pursuit of narrowband multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters with both high efficiency and color purity remains a critical challenge in the field of organic light-emitting diodes (OLEDs). A novel molecular design paradigm is proposed by hybridizing di-/tri-spiral donors in polycyclic heteroaromatic frameworks. The orthogonal, sterically hindered spiral donors disrupt molecular planarity, which can simultaneously suppress the aggregation-caused quenching and spectral broadening. These emitters exhibit narrowband emission with full-width at half-maximum of 22-24 nm and high photoluminescence quantum yields of ∼100%. The tri-spiral donor configuration further improves horizontal dipole orientation for the enhanced light outcoupling. As a result, the optimal Ts-NBN-based OLED achieves a maximum external quantum efficiency of 39.1% with the CIE y value of 0.70.