Spiro Unit-based Multi-Resonance Organic Electroluminescent Materials

Abstract

Spiral groups possess unique three-dimensional structural features, strong rigidity, non-conjugation, and high dipole orientation potential, thus demonstrating broad application prospects in the construction of various high-performance organic electroluminescent (EL) materials. With the development of ultra-high-definition (UHD) display technology, the color purity of luminescent materials in organic light-emitting diodes (OLEDs) has become a key factor affecting display performance. Boron/nitrogen (B/N)-based multi-resonant (MR) materials can effectively reduce the width of the emission peak, partially meeting the requirements of UHD for narrow emission bands. The spiral structure, with its unique properties such as high rigidity, when combined with the B/N system, achieves a synergistic effect, significantly enhancing material performance and making breakthroughs in the development of narrow-band emission materials that meet UHD requirements. This review systematically summarizes the latest research progress of B/N-MR materials based on spiralstructured aromatic compounds, classifies and organizes existing research results, deeply analyzes the related molecular design strategies, and focuses on discussing the relationship between material structure and its photoelectric properties. Additionally, based on the characteristics of the spiro structure, this work proposes potential directions for future molecular design and looks forward to the development trends in this field.