Developing open-shell singlet (OS) diradicals with high luminescent properties and exceptional single-molecule magnetoluminescence (ML) performance is extremely challenging. Herein, we propose a concept to enhance luminescent efficiency by adjusting the donor conjugation of OS diradicals, thereby achieving a highly luminescent diradical, DR1, with outstanding stability and making it a viable option for use in the emitting layer of organic light-emitting diodes (OLEDs). More importantly, the 0.5 wt%-DR1 doped film demonstrates significant single-molecule magnetoluminescence (ML) properties. A giant ML value of 210% is achieved at a magnetic field of 7 T, showing the great potential of DR1 in magneto-optoelectronic devices.

开发具有高发光特性和出色的单分子磁致发光（ML）性能的开壳单线态（OS）双自由基极具挑战性。在此，我们提出了通过调整OS双自由基的供体共轭来提高发光效率的概念，从而获得具有出色稳定性的高发光双自由基DR1，使其成为有机发光二极管发光层的可行选择（ OLED）。更重要的是，0.5 wt%-DR1 掺杂薄膜表现出显着的单分子磁致发光 (ML) 特性。在7 T磁场下实现了210%的巨大ML值，显示了DR1在磁光电子器件中的巨大潜力。