Recent Advances in Multiple Resonance Organic/Polymer Fluorescent Materials with Narrowband Emission★

Multiple resonance (MR) emitters can be considered as intramolecular push-pull electronic systems formed by embedding electron-deficient atoms and electron-rich atoms in polycyclic aromatic skeleton.Since the structural relaxation of excited state is suppressed by the rigid molecular skeleton, multiple resonance emitters exhibit the prominent feature of narrowband emission, which enables them to attract wide attention of researchers since its report.Up to now blue, green and red multiple resonance emitters with both high device efficiency and high color purity were developed, making them become an important research direction for organic/polymeric fluorescent materials.In this review, recent advances in narrowband multiple resonance emitters are summarized from the perspective of materials and devices, with focus on B/N-, B/O(S)-, C＝ O/N-containing and indolocarbazole-based multiple resonance emitters.The effects of elements composition, molecular framework and substituents on their luminescent characteristics and device performances are summarized.Meanwhile, opportunities and challenges for future development of multiple resonance emitters are analyzed and prospected.