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| 吡啶基咔唑晶体及其长寿命室温磷光研究 |
| Study on Pyridinyl carbazole Crystals and Their Long-Lifetime Room-Temperature Phosphorescence |
| 投稿时间:2026-04-05 修订日期:2026-05-07 |
| DOI: |
| 中文关键词: 咔唑,吡啶,有机室温磷光,长寿命,晶体 |
| 英文关键词:Carbazole, Pyridine, Organic room-temperature phosphorescence, Long lifetime, Crystals |
| 基金项目:国家自然科学基金项目(No.22476118) |
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| 中文摘要: |
| 本文合成了9-(吡啶-4-基)-9H-咔唑(9-PC),通过核磁共振氢谱和质谱确证了其化学结构。紫外-可见吸收光谱表明,9-PC表现出咔唑化合物特有的π-π*跃迁吸收峰,与母体咔唑相似,保留了咔唑基团的基本电子结构。系统的光物理性质表征及与母体咔唑(Cz)和N-甲基咔唑(9-Me-C)的对比显示,9-PC晶体具有优异的室温磷光特性,磷光寿命长达424.5 ms,远超Cz和9-Me-C。X-射线单晶衍射分析表明,9-PC分子间形成独特的反向π-π堆积和C–H···π氢键网络,构建了刚性分子环境,有效稳定了三重态激子。本研究证明,在咔唑N-位引入吡啶基可协同调控分子堆积与电子结构,显著延长室温磷光寿命,为开发新型长寿命有机室温磷光材料提供了可行的分子设计策略,在光电显示、信息加密、生物成像等领域具有潜在的应用前景。 |
| 英文摘要: |
| In this work, 9-(pyridin-4-yl)-9H-carbazole (9-PC) was synthesized and its chemical structure was confirmed by 1H NMR spectroscopy and mass spectrometry. UV-Vis absorption spectra showed that 9-PC exhibits the characteristic π-π* transition of carbazole compounds, similar to that of the parent carbazole, indicating that the 9-PC molecule retains the basic electronic structure of the carbazole group. Systematic photophysical property characterization and comparison with parent carbazole (Cz) and N-methylcarbazole (9-Me-C) revealed that 9-PC crystals possess excellent room-temperature phosphorescence with a lifetime up to 424.5 ms, far exceeding those of Cz and 9-Me-C. Single-crystal X-ray diffraction analysis demonstrated that unique antiparallel π-π stacking and C–H···π hydrogen bonding networks in 9-PC construct a rigid molecular environment that effectively stabilizes triplet excitons. This study demonstrates that introducing a pyridyl group at the N-position of carbazole can synergistically modulate molecular packing and electronic structure, thereby significantly prolonging the RTP lifetime. It provides a feasible molecular design strategy for developing new long-lived organic RTP materials with potential applications in optoelectronic displays, information encryption, and bioimaging. |
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