Precise Functionalization of Multiple Resonance Framework: Constructing Narrowband Organic Electroluminescent Materials with External Quantum Efficiency over 40.

It is of important strategic significance to develop high-efficiency narrowband organic electroluminescent materials that can be employed to fabricate ultrahigh-definition display with wide color gamut. This topic implies a great challenge to molecular design and synthesis, especially for the development of universality, diversity, scalability and robustness of molecular architectonics. In this contribution, a synthetic methodology has been demonstrated for functionalizing brominated B-N-containing multiple resonance (MR) framework with multifarious functional groups, such as donors, acceptors and moieties without obvious push-pull electron properties. The m-DPAcP-BNCz-based organic light-emitting diode (OLED) exhibits green emission with full-width at half-maximum (FWHM) of 28 nm and maximum external quantum efficiency (EQE) of 40.6%. The outstanding performance of m-DPAcP-BNC is attributed to the perfect integration of the inherent advantages of MR framework and donor-acceptor configuration, which can not only achieve bathochromic shift and narrowband emission, but also obtain high photoluminescence quantum yield (Ф PL ) and horizontal emitting dipole orientation ratio (Θ // ). This straightforward and efficient approach provides insightful guidance for the construction and enrichment of more high-efficiency narrowband emitters. This article is protected by copyright. All rights reserved.