Hybridized Multi‐Spiral Donor Engineering for High‐Efficiency Narrowband Thermally Activated Delayed Fluorescence Emitters
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.
Authors
- Hao‐Ze Li (ORCID: https://orcid.org/0009-0006-9047-4323)
- Feng‐Ming Xie (ORCID: https://orcid.org/0000-0001-7988-3755)
- Yan Yang (ORCID: https://orcid.org/0000-0003-3497-7373)
- Jianxin Tang (ORCID: https://orcid.org/0000-0002-6813-0448)
- Yanqing Li (ORCID: https://orcid.org/0000-0002-3532-4254)
- Yue Zhao (ORCID: https://orcid.org/0000-0003-3805-156X)
Institutions
- Macau University of Science and Technology (MO)
- University of Macau (MO)
- Soochow University (CN)
- Zero to Three (US)
- East China Normal University (CN)
Publication Details
- Journal
- Angewandte Chemie International Edition
- Published
- 2025-09-22
- DOI
- https://doi.org/10.1002/anie.202518014
- Citations
- 1
- Primary Topic
- Organic Light-Emitting Diodes Research
- Type
- article
- Field-Weighted Citation Impact
- 0.73