American Chemical Society
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Cellulose Nanocrystal Films with NIR-II Circularly Polarized Light for Cancer Detection Applications

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journal contribution
posted on 2022-12-23, 14:34 authored by Di Lu, Mengfei Li, Xiaoqing Gao, Xiao Yu, Lihong Wei, Shoujun Zhu, Yan Xu
Near-infrared circularly polarized light is attractive for wide-ranging applications. However, high-performance near-infrared circularly polarized light is challenging to realize. Here, we show that left-handed chiral photonic cellulose nanocrystal (CNC) films produced from ultrasonicated suspensions enable right-handed circularly polarized luminescence with a dissymmetry factor of −0.330 in the second near-infrared window (NIR-II). We present a theoretical analysis of the adverse effect of structural defects and luminescence intensity heterogeneity on the right-handed circularly polarized luminescence glum inside the bandgap and the occurrence of left-handed circularly polarized luminescence at the band edges. We demonstrate the potential of the chiral photonic CNC films with NIR-II circularly polarized light for cancer cell discrimination. The present work identifies key scientific questions in CNC-based circularly polarized luminescence materials research.