The development of the photostable higher‐order multiphoton‐excited (MPE) upconversion single microcrystalline material is fundamentally and technologically important, but very challenging. Here, up to five‐photon excited luminescence in a host–guest metal–organic framework (MOF) and perovskite quantum dot (QD) hybrid single crystal ZJU‐28⊃MAPbBr₃ is shown via an in situ growth approach. Such a MOF strategy not only results in a high QD loading concentration, but also significantly diminishes the aggregation‐caused quenching (ACQ) effect, provides effective surface passivation, and greatly reduces the contact of the QDs with the external bad atmosphere due to the confinement effect and protection of the framework. These advantages make the resulting ZJU‐28⊃MAPbBr₃ single crystals possess high PLQY of ≈51.1%, a high multiphoton action cross‐sections that can rival the current highest record (measured in toluene solution), and excellent photostability. These findings liberate the excellent luminescence and nonlinear optical properties of perovskite QDs from the solution system to the solid single‐crystal system, which provide a new avenue for the exploitation of high‐performance multiphoton excited hybrid single microcrystal for future optoelectronic and micro–nano photonic integration applications.

中文翻译：

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将钙钛矿-QD限制在单个MOF晶体中以显着增强多光子激发发光

光稳定的高阶多光子激发（MPE）上转换单微晶材料的开发从根本上和技术上都很重要，但非常具有挑战性。在此，在主-客体金属-有机骨架（MOF）和钙钛矿量子点（QD）的混合单晶ZJU-28⊃MAPbBr最多五个光子激发发光₃经由在原位生长的方法所示。这种MOF策略不仅会导致高QD负载浓度，而且会大大减少聚集引起的淬火（ACQ）效应，提供有效的表面钝化作用，并大大减少了QD与封闭引起的外部不良气氛的接触框架的效果和保护。这些优势使得ZJU‐28⊃MAPbBr _{3成为可能}单晶的PLQY约为51.1％，具有高的多光子作用截面，可以与目前的最高记录（在甲苯溶液中测量）相媲美，并且具有出色的光稳定性。这些发现释放了钙钛矿量子点从溶液系统到固体单晶系统的出色的发光和非线性光学特性，这为开发高性能多光子激发的混合单晶提供了新的途径，可用于未来的光电子和微纳米光子。集成应用程序。