期刊
CHEMICAL SCIENCE
卷 10, 期 28, 页码 6821-6827出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc01577a
关键词
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资金
- National Natural Science Foundation of China [91856115, 51673050, 21802027]
- Ministry of Science and Technology of the People's Republic of China [2017YFA0206600, 2016YFA0203400]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-SLH044]
- New Hundred-Talent Program research fund of the Chinese Academy of Sciences
Achieving a higher dissymmetry factor is a crucial issue in developing circularly polarized luminescence (CPL) materials. Here, by tailoring the solvent composition and the morphology of the same chiral emissive small molecules (R- or S-SPAn), circularly polarized emission with a boosted dissymmetry factor (two orders) was realized. It was found that by regulating the water fraction in the mixed THF/H2O, we were able to achieve kinetic control over association of chiral emissive R- or S-SPAn into various nanostructures with 0D nanospheres, 2D nanoflakes and 3D stacked nanoflakes. These nanostructures are all CPL active. Remarkably, the dissymmetry factors of the nanostructures were significantly enhanced compared to those of the molecules and further boosted in different morphologies, from similar to 10(-4) (0D nanospheres) to 10(-3) (2D flake) to similar to 10(-2) (3D nanoflakes). The enlarged g(lum) value could be assigned to a good packing induced strong luminescence of an excimer. This strategy provides an efficient way to fabricate higher dissymmetry factor CPL organic nanomaterials by only changing the supramolecular architectures while using the same chiral small molecules.
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