Lai Jingyi, Zhou Bo, Wang Ke-Zhi, Yan Dongpeng
Beijing Key Laboratory of Energy Conversion and Storage Materials, and Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
J Phys Chem Lett. 2023 Aug 17;14(32):7165-7172. doi: 10.1021/acs.jpclett.3c01442. Epub 2023 Aug 4.
Room-temperature phosphorescent (RTP) based long-afterglow materials have shown broad application prospects in smart sensors, biological imaging, photodynamic therapy, and many others. However, the fabrication of red long-afterglow materials still faces a great challenge due to the competitive relationship between RTP efficiency and lifetime. In this work, we reported a series of layered double hydroxide (LDHs) nanosheets with red long-afterglow (quantum yield up to 42.35% and lifetime up to 256.77 ms) by taking advantage of the highly efficient triplet-triplet energy transfer from green phosphorescent LDHs to the red fluorescent dye rhodamine B (RhB, as a guest molecule). Specifically, the Zn-based LDHs@RhB composite (Zn-Al-LDH-4-CBBA@RhB) presents energy transfer efficiency as high as 95.18%, and the red long-afterglow could even be excited upon white-light irradiation. Benefiting from the time-resolved afterglow, the LDHs@RhB composites exhibit great potential in the fields of anticounterfeiting and information encryption.
基于室温磷光（RTP）的长余辉材料在智能传感器、生物成像、光动力疗法等众多领域展现出广阔的应用前景。然而，由于RTP效率与寿命之间的竞争关系，红色长余辉材料的制备仍面临巨大挑战。在这项工作中，我们通过利用从绿色磷光层状双氢氧化物（LDHs）到红色荧光染料罗丹明B（RhB，作为客体分子）的高效三重态-三重态能量转移，报道了一系列具有红色长余辉的层状双氢氧化物（LDHs）纳米片（量子产率高达42.35%，寿命长达256.77 ms）。具体而言，基于锌的LDHs@RhB复合材料（Zn-Al-LDH-4-CBBA@RhB）呈现出高达95.18%的能量转移效率，并且红色长余辉甚至可以在白光照射下被激发。受益于时间分辨余辉，LDHs@RhB复合材料在防伪和信息加密领域展现出巨大潜力。
