State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
Nano Lett. 2023 May 24;23(10):4384-4389. doi: 10.1021/acs.nanolett.3c00655. Epub 2023 May 10.
Circularly polarized luminescence (CPL) is well-studied in molecular systems but has been rarely reported in pure inorganic nanoscale crystals. Herein, we develop a family of pure inorganic rare-earth nanowires with robust and color-tunable CPL emissions. The chiral rare earth nanowires possess intrinsic atomic chirality with controlled handedness that is guided by the enantiomers with molecular chirality in the synthesis. By varying luminescent ions incorporated in the crystal lattice, color-tunable CPL can be achieved and is thermally robust, preserving emission over 300 °C, distinct from existing CPL-active materials. Moreover, as a proof of concept, we demonstrate that the synthesized nanostructures can be easily dispersed in a polymer matrix to enable transparent and flexible CPL films. This study opens up a promising avenue to design robust and tunable CPL materials helpful to the understanding of inorganic chiral information and capable of further applications in novel optoelectronic devices.
圆偏振发光（CPL）在分子体系中研究得很好，但在纯无机纳米晶体中很少有报道。在此，我们开发了一系列具有强 CPL 发射和可调色彩的纯无机稀土纳米线。手性稀土纳米线具有内在的原子手性，其手性由合成过程中具有分子手性的对映体控制。通过改变晶格中掺入的发光离子，可以实现可调色彩的 CPL，且其热稳定性强，在 300°C 以上仍能保持发光，这与现有的 CPL 活性材料不同。此外，作为概念验证，我们证明合成的纳米结构可以很容易地分散在聚合物基质中，从而实现透明和灵活的 CPL 薄膜。这项研究为设计稳健和可调谐 CPL 材料开辟了一条有前途的途径，有助于理解无机手性信息，并能够进一步应用于新型光电设备。
