Fan Tianjiao, Qu Cheng, Duan Lian, Zhang Yuewei
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Laboratory of Flexible Electronics Technology, Tsinghua University, Beijing 100084, China.
Natl Sci Rev. 2025 Jul 3;12(8):nwaf250. doi: 10.1093/nsr/nwaf250. eCollection 2025 Aug.
Macrocyclic compounds featuring narrowband emission represent critical advancements for next-generation wide-color-gamut displays. In this work, we report the rational design and synthesis of an ultra-narrowband boron- and nitrogen-embedded cyclophane (BN-CP) through a one-pot triple intramolecular Bora-Friedel-Crafts reaction using aza[1]cyclophane as the precursor. X-ray crystallography and density functional theory calculations highlighted the role of increased conformational rigidity after cyclization in facilitating spectral narrowing. Furthermore, BN-CP demonstrated narrowband deep-blue thermally activated delayed fluorescence, characterized by a full width at half maximum of 24 nm, arising from the synergistic multiple resonance effects of its three boron and nitrogen centers. The corresponding organic light-emitting diode achieved a peak external quantum efficiency of 23.3%, positioning it among the highest-performing deep-blue MR-OLEDs reported to date.
具有窄带发射的大环化合物是下一代广色域显示器的关键进展。在这项工作中，我们报道了以氮杂[1]环芳烷为前体，通过一锅法三重分子内硼-傅克反应合理设计并合成了一种超窄带硼氮嵌入环芳烷（BN-CP）。X射线晶体学和密度泛函理论计算突出了环化后构象刚性增加在促进光谱变窄方面的作用。此外，BN-CP表现出窄带深蓝色热激活延迟荧光，半高宽为24纳米，这源于其三个硼和氮中心的协同多共振效应。相应的有机发光二极管实现了23.3%的峰值外量子效率，使其跻身于迄今为止报道的最高性能深蓝色多共振有机发光二极管之列。
