Wang Yipu, Zhang Jianyu, Xu Qingyang, Tu Weihao, Wang Lei, Xie Yuan, Sun Jing Zhi, Huang Feihe, Zhang Haoke, Tang Ben Zhong
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310058, China.
Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, 311215, China.
Nat Commun. 2024 Jul 30;15(1):6426. doi: 10.1038/s41467-024-50815-x.
Different from traditional organic luminescent materials based on covalent delocalization, clusteroluminescence from nonconjugated luminogens relies on noncovalent through-space conjugation of electrons. However, such spatial electron delocalization is usually weak, resulting in low luminescent efficiency and board emission peak due to multiple vibrational energy levels. Herein, several nonconjugated luminogens are constructed by employing biphenyl as the building unit to reveal the structure-property relationship and solve current challenges. The intramolecular through-space conjugation can be gradually strengthened by introducing building units and stabilized by rigid molecular skeleton and multiple intermolecular interactions. Surprisingly, narrowband clusteroluminescence with full width at half-maximum of 40 nm and 100% efficiency is successfully achieved via an asymmetric conformation, exhibiting comparable performance to the traditional conjugated luminogens. This work realizes highly efficient and narrowband clusteroluminescence from nonconjugated luminogens and highlights the essential role of structural conformation in manipulating the photophysical properties of unconventional luminescent materials.
与基于共价离域的传统有机发光材料不同，非共轭发光体的聚集发光依赖于电子的非共价空间共轭。然而，这种空间电子离域通常较弱，由于多个振动能级导致发光效率低且发射峰宽。在此，通过使用联苯作为构建单元构建了几种非共轭发光体，以揭示结构-性质关系并解决当前的挑战。通过引入构建单元可以逐渐增强分子内空间共轭，并通过刚性分子骨架和多种分子间相互作用使其稳定。令人惊讶的是，通过不对称构象成功实现了半高宽为40nm且效率为100%的窄带聚集发光，其性能与传统共轭发光体相当。这项工作实现了非共轭发光体的高效窄带聚集发光，并突出了结构构象在操纵非常规发光材料光物理性质中的重要作用。
