On‐Demand Circularly Polarized Room‐Temperature Phosphorescence in Chiral Nematic Nanoporous Silica Films
On‐Demand Circularly Polarized Room‐Temperature Phosphorescence in Chiral Nematic Nanoporous Silica Films
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DOI：
10.1002/adom.202102015
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发表时间：
2022-02
影响因子：
9
通讯作者：
Dan Zhang;Hongzhi Zheng;Xiaoting Ma;Lina Su;Xiaoqing Gao;Zhiyong Tang;Yan Xu
中科院分区：
文献类型：
--
作者：
Dan Zhang;Hongzhi Zheng;Xiaoting Ma;Lina Su;Xiaoqing Gao;Zhiyong Tang;Yan Xu
圆偏振室温磷光(CPRTP)在信息编码、生物成像和光电子器件等领域具有重要的应用价值，但如何制备具有可控利手性和长余辉的高效CPRTP材料仍是一项具有挑战性的工作。这里，作为一个突出的新发现，论述了利用富含地球的纤维素和二氧化硅实现具有按需手性的超长CPRTP的简单方法。结果表明，具有缺陷光致发光特性的左手手性向列相纳米多孔二氧化硅薄膜能够实现超长的CPRTP，并具有前所未有的手性控制能力。结果表明，手性向列型纳米多孔二氧化硅薄膜表现出右旋和左旋共振色谱，其磷光不对称因子分别达到−0.130和0.093，余辉寿命分别为1.094和0.949 S。展示了具有超长CPRTP和左手圆偏振光选择性反射能力的手性向列型纳米二氧化硅透明薄膜在发展防伪光学标签方面的潜力。这项工作提出了一种通用的策略，并朝着开发具有按需手性的超长CPRTP材料迈出了一步，该材料可以从现成的缺陷荧光粉中获得，用于光子应用。
Circularly polarized room‐temperature phosphorescence (CPRTP) is of paramount importance for applications in information encoding, bioimaging, and optoelectronic devices, however, it remains challenging to organize highly efficient CPRTP materials with controlled handedness and long afterglow. Herein, as an outstanding novel finding, it is diclosed that ultralong CPRTP with on‐demand chiroptical properties is simple to realize using the earth‐abundant cellulose and silica. It is shown that left‐handed chiral nematic nanoporous silica films featuring defect photoluminescence enable ultralong CPRTP with an unprecedented control of the handedness. This work presents that the chiral nematic nanoporous silica films display right‐handed CPRTP and left‐handed CPRTP with the phosphorescence dissymmetry factors up to −0.130 and 0.093 as well as the afterglow lifetimes of 1.094 and 0.949 s, respectively. The potential of the transparent chiral nematic nanoporous silica films, capable of ultralong CPRTP and selective reflection of left‐handed circularly polarized light, for the development of anticounterfeiting optical labels is showcased. This work presents a versatile strategy and a step toward the development of ultralong CPRTP materials with on‐demand chiroptical properties from readily available defect phosphors for photonic applications.