Lu Rong, Wen Zhuangchuan, Zhang Pengfei, Chen Yang, Wang Huihui, Jin Huile, Zhang Lijie, Chen Yihuang, Wang Shun, Pan Shuang
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China.
Institute of New Materials and Industrial Technologies, Wenzhou University, Wenzhou, 325035, China.
Small. 2024 Jul;20(30):e2311013. doi: 10.1002/smll.202311013. Epub 2024 Feb 19.
The ability to design halide perovskite nanocrystals (PNCs) with circularly polarized luminescence (CPL) offers exceptional potential in photonic technologies. Despite recent inspiring advances, the creation of PNCs with full-color tailorablity, outstanding CPL, and long-term stability remains a substantial challenge. Herein, a robust strategy to craft CPL-active PNCs is reported, exhibiting appealing full-color tunable wavelengths, enhanced CPL, and prolonged stability. In contrast to conventional methodologies, this strategy utilizes chiral nematic mesoporous silica (CNMS) as host to render in situ confined growth of diverse achiral PNCs. By strategically engineering photonic bandgap, adjusting loading amount of PNCs, and manipulating cations/anion compositions of PNCs, robust CPL responses with tunable wavelength and intensity are successfully obtained. The resulting PNCs-CNMS achieves stable CPL emissions with full-color tunability and impressive luminescent dissymmetric factors up to -0.17. Remarkably, silica-based hosts as a protective barrier confer exceptional resistance to humidity, photodegradation, and thermal stability, even up to 95 °C. Furthermore, the ability to achieve reversible CPL switching within PNCs-CNMS is attainable by leveraging the responsiveness of CNMS matrix or dynamic behavior of impregnated PNCs. Additionally, circularly polarized light-emitting diode devices based on PNCs-CNMS can be conveniently fabricated. This research affords a powerful platform for designing functional chiroptical materials.
设计具有圆偏振发光（CPL）的卤化物钙钛矿纳米晶体（PNCs）的能力在光子技术中具有巨大潜力。尽管最近取得了令人鼓舞的进展，但制备具有全色可定制性、出色的CPL和长期稳定性的PNCs仍然是一项重大挑战。在此，报道了一种制备具有CPL活性的PNCs的稳健策略，该策略展示了吸引人的全色可调波长、增强的CPL和延长的稳定性。与传统方法不同，该策略利用手性向列介孔二氧化硅（CNMS）作为主体，使多种非手性PNCs原位受限生长。通过策略性地设计光子带隙、调整PNCs的负载量以及操纵PNCs的阳离子/阴离子组成，成功获得了具有可调波长和强度的稳健CPL响应。所得的PNCs-CNMS实现了具有全色可调性的稳定CPL发射，发光不对称因子高达-0.17。值得注意的是，基于二氧化硅的主体作为一种保护屏障，赋予了对湿度、光降解和热稳定性的卓越抗性，甚至在高达95°C的温度下也是如此。此外，通过利用CNMS基质的响应性或浸渍的PNCs的动态行为，可以在PNCs-CNMS内实现可逆的CPL切换。此外，基于PNCs-CNMS的圆偏振发光二极管器件可以方便地制备。这项研究为设计功能性手性光学材料提供了一个强大的平台。
