He Huajun, Wang Bo, Shen Xuhai, Feng Minjun, Rao Haixia, Ye Senyun, Nguyen Linh Lan, Duchamp Martial, Li Shuzhou, Tian He, Sum Tze Chien
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Center of Electron Microscope, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Adv Mater. 2025 Aug;37(33):e2500349. doi: 10.1002/adma.202500349. Epub 2025 May 22.
Aqueous solutions of nanoparticles are the cornerstones for applications in diagnostics, catalysis and more, where control over the nanoparticle's dispersion is pivotal to tailoring the final product properties. Of late, halide perovskite nanocrystals (HPNCs) with outstanding optoelectronic properties emerge as a class of semiconductor nanocrystals distinct from the incumbents. However, HPNCs are particularly susceptible to moisture induced degradation, limiting their utility and regulation in aqueous environments. Here, this hurdle is overcome to realize stable, mono-disperse, highly emissive HPNCs in aqueous environments even under ultra-dilute conditions. These colloidal HPNCs are synthesized via a facile room-temperature structural transformation-induced in situ core-shell self-assembly mechanism in contrast to the widely used pre-core-shell approach. The green HPNCs exhibit >80% photoluminescence quantum yield (PLQY) with excellent water dispersion stability (i.e., zeta potential >80 mV) even after >10,000 h in water. Unprecedented aqueous solution phase single-photon emission with g(0) <0.2 at concentrations as low as ≈0.1 nM is measured. These aqueous HPNCs offer full color tunability that covers the entire Rec. 2020 standard. These findings will lay the foundation for innovative applications of HPNCs in aqueous environments, unlocking new opportunities for nanoscale sensing and optofluidics in photonics, environmental science, and materials engineering.
纳米颗粒的水溶液是诊断、催化等应用的基石，其中对纳米颗粒分散性的控制对于定制最终产品性能至关重要。近来，具有出色光电性能的卤化物钙钛矿纳米晶体（HPNCs）作为一类不同于现有晶体的半导体纳米晶体出现。然而，HPNCs特别容易受到水分诱导的降解，限制了它们在水性环境中的实用性和调控性。在此，克服了这一障碍，即使在超稀条件下，也能在水性环境中实现稳定、单分散、高发射性的HPNCs。与广泛使用的预核壳方法不同，这些胶体HPNCs是通过一种简便的室温结构转变诱导的原位核壳自组装机制合成的。绿色HPNCs即使在水中放置超过10000小时后，仍具有>80%的光致发光量子产率（PLQY）和出色的水分散稳定性（即zeta电位>80 mV）。在低至≈0.1 nM的浓度下，测量到了g(0)<0.2的前所未有的水溶液相单光子发射。这些水性HPNCs提供了覆盖整个Rec. 2020标准的全色可调性。这些发现将为HPNCs在水性环境中的创新应用奠定基础，为光子学、环境科学和材料工程中的纳米级传感和光流体学带来新机遇。
