Two-photon excited deep-red and near-infrared emissive organic co-crystals
Two-photon excited deep-red and near-infrared emissive organic co-crystals
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DOI：
10.1038/s41467-020-18431-7
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发表时间：
2020-09
影响因子：
16.6
通讯作者：
Yu Wang;Huan-Bao Wu;Penghao Li;Su Chen;Leighton O. Jones;Martín A. Mosquera;Long Zhang;K. Cai-K.-Ca
中科院分区：
文献类型：
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作者：
Yu Wang;Huan-Bao Wu;Penghao Li;Su Chen;Leighton O. Jones;Martín A. Mosquera;Long Zhang;K. Cai-K.-Ca
与其他光学材料相比，双光子激发的近红外荧光材料因其优越的光学穿透性、更高的空间分辨率和更低的光学散射而引起人们的极大关注。本文采用一种简便、高效的超分子方法合成了双光子激发的近红外发射共晶材料。基于萘二亚胺的三角形大环和冠烯选择性地形成两个共晶。三角形的共晶发射出深红色的荧光，而四边形的共晶发射出以668 nm为中心的深红色和近红外发射，与其前驱体相比，红移了162 nm。得益于分子间电荷转移相互作用，这两种共晶体具有比其各自组分更高的计算双光子吸收截面。它们的双光子吸收带到达电磁光谱的NIR-II区域。这种四边形的共晶构成了一种独特的材料，它同时表现出双光子吸收和近红外发射。这种共结晶策略为未来更先进的光学材料的设计和合成带来了巨大的希望。
Two-photon excited near-infrared fluorescence materials have garnered considerable attention because of their superior optical penetration, higher spatial resolution, and lower optical scattering compared with other optical materials. Herein, a convenient and efficient supramolecular approach is used to synthesize a two-photon excited near-infrared emissive co-crystalline material. A naphthalenediimide-based triangular macrocycle and coronene form selectively two co-crystals. The triangle-shaped co-crystal emits deep-red fluorescence, while the quadrangle-shaped co-crystal displays deep-red and near-infrared emission centered on 668 nm, which represents a 162 nm red-shift compared with its precursors. Benefiting from intermolecular charge transfer interactions, the two co-crystals possess higher calculated two-photon absorption cross-sections than those of their individual constituents. Their two-photon absorption bands reach into the NIR-II region of the electromagnetic spectrum. The quadrangle-shaped co-crystal constitutes a unique material that exhibits two-photon absorption and near-infrared emission simultaneously. This co-crystallization strategy holds considerable promise for the future design and synthesis of more advanced optical materials.