共晶提升纯有机材料室温磷光余辉性能
收稿日期: 2024-03-23
修回日期: 2024-04-24
网络出版日期: 2024-05-11
基金资助
国家自然科学基金(52073172); 国家自然科学基金(U22A20250)
Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics
Received date: 2024-03-23
Revised date: 2024-04-24
Online published: 2024-05-11
Supported by
National Natural Science Foundation of China(52073172); National Natural Science Foundation of China(U22A20250)
纯有机超长寿命室温磷光(p-RTP)材料因其独特的光物理性质, 低成本, 结构可设计性及其在生物影像、疾病诊疗、传感与防伪加密等领域的应用前景引起了广泛关注. 然而, 要实现兼具高效且颜色可调的p-RTP余辉发射, 仍颇具挑战. 受簇聚诱导发光(CTE)机理启发, 选用三聚氰胺(MA)和环酰脲化合物海因(HA)及二氢尿嘧啶(DHU)作为电子给体和受体, 采用共晶策略制备了1∶1计量组成的共晶. 较MA、HA及DHU单组分晶体而言, 共晶展现出更好的p-RTP颜色可调性及更长寿命, 这是共晶中广泛存在C=O、孤对电子、多重氢键、适当电荷转移及多重簇发光中心等协同作用的结果, 并进一步展示了这些共晶材料在高端防伪保密领域的应用.
崔怡静 , 朱天文 , 张强 , 袁望章 . 共晶提升纯有机材料室温磷光余辉性能[J]. 有机化学, 2024 , 44(8) : 2588 -2594 . DOI: 10.6023/cjoc202401023
Pure organic materials with persistent room-temperature phosphorescent (p-RTP) have attracted extensive attention due to their unique photophysical properties, low cost, design flexibility, and promising applications in such areas as biomedical imaging, disease diagnosis and treatment, sensing, and anti-counterfeiting encryption. Achieving efficient, long-lived, and tunable p-RTP afterglows, however, remains a significant challenge. Herein, inspired by the clustering- triggered emission (CTE) mechanism, utilizing the cocrystallization strategy, cocrystals with stoichiometric ratio of 1∶1 were prepared by employing melamine (MA) and cyclic acylureas of hydantoin (HA) and dihydrouracil (DHU) as electron donor and acceptors, respectively. Compared to the single-component crystals of MA, HA, and DHU, the cocrystals exhibited better color-tunability and longer lifetimes for p-RTP emissions, which are attributable to the synergistic effects of the widespread presence of C=O groups, lone pair electrons, multiple hydrogen bonds, appropriate charge transfer, and multiple emissive clusters. Furthermore, advanced anti-counterfeiting and encryption applications of these cocrystalss were demonstrated.
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