School of Chemical Science and Technology, Yunnan University, 650091, Kunming, People's Republic of China.
School of Physics and Astronomy, Yunnan University, 650091, Kunming, People's Republic of China.
Nat Commun. 2023 Mar 25;14(1):1678. doi: 10.1038/s41467-023-37414-y.
Pure organic phosphors capable of room-temperature phosphorescence show a great potential in organic light-emitting diodes, while it is limited by the big challenge to realize efficient electroluminescence under electric excitation. Herein, we develop a class of organic phosphors based on acridine as the electron donor, triazine as the electron acceptor and oxygen as the bridge between them. Benefitting from the characteristic donor-oxygen-acceptor geometry, these compounds are found to behave an exciting aggregation-induced organic room-temperature electrophosphorescence, and achieve a record-high external quantum efficiency of 15.8% for non-doped devices. Furthermore, they can sensitize multi-resonant emitters in the absence of any additional wide bandgap host, leading to an effective narrowband emission with a peak external quantum efficiency of 26.4% and a small full-width at half maximum of 26 nm. The results clearly indicate that donor-oxygen-acceptor geometry is a promising strategy to design organic phosphors suitable for organic light-emitting diodes.
纯有机磷光体能够在室温下磷光，在有机发光二极管中具有很大的潜力，但其在电激发下实现高效电致发光受到很大的挑战限制。在此，我们开发了一类以吖啶为电子给体、三嗪为电子受体和氧为它们之间桥梁的有机磷光体。得益于供体-氧-受体的几何特征，这些化合物表现出令人兴奋的聚集诱导的有机室温电磷光，为非掺杂器件实现了创纪录的 15.8%的外量子效率。此外，它们可以在没有任何额外宽带隙主体的情况下敏化多共振发射器，导致具有 26.4%的峰值外量子效率和 26nm 小半峰全宽的有效窄带发射。结果清楚地表明，供体-氧-受体的几何特征是设计适合有机发光二极管的有机磷光体的一种很有前途的策略。
