Cesium lead halide perovskite (CsPbX₃, X= Cl, Br, I) quantum dots (QDs) and their partly Mn²⁺-substituted QDs (CsPb_1−xMn_xX₃) attract considerable attention owing to their unique photoluminescence (PL) efficiencies. The two types of QDs, having different PL decay dynamics, needed to be further investigated in a form of aggregates to understand their solid-state-induced exciton dynamics in conjunction with their behaviors upon degradation to achieve practical applications of those promising QDs. However, thus far, these QDs have not been sufficiently investigated to obtain deep insights related to the long-term stability of their PL properties as aggregated solid-states. Therefore, in this study, we comparatively examined CsPbX₃- and CsPb_1−xMn_xX₃-type QDs stocked for >50 d under dark ambient conditions by using excitation wavelength-dependent PL quantum yield and time-resolved PL spectroscopy. These investigations were performed with powder samples in addition to solutions to determine the influence of the inter-QD interaction of the aged QD aggregates on their radiative decays. It turns out that the Mn²⁺-substituted QDs exhibited long-lasting PL quantum efficiencies, while the unsubstituted CsPbX₃-type QDs exhibited a drastic reduction of their PL efficiencies. And the obtained PL traces were clearly sensitive to the sample status. This is discussed with the possible interaction depending on the size and distance of the QD aggregates.

铯铯卤化钙钛矿（CsPbX ₃，X = Cl，Br，I）量子点（QDs）及其部分被Mn ²⁺取代的QD（CsPb _{1- x} Mn _x X ₃）由于其独特的光致发光（PL）效率而备受关注。两种具有不同PL衰减动力学的QD需要以聚集体的形式进一步研究，以了解其固态诱导的激子动力学以及它们在降解时的行为，以实现那些有前途的QD的实际应用。但是，到目前为止，尚未对这些QD进行充分的研究，以获取与作为聚集固态的PL特性的长期稳定性有关的深刻见解。因此，在这项研究中，我们比较检查了CsPbX _3-和CsPb _{1− x} Mn _x X ₃通过使用依赖于激发波长的PL量子产率和时间分辨PL光谱，在黑暗环境条件下将> 50 d型QD储存> 50 d。除了解决方案外，还对粉末样品进行了这些研究，以确定老化的QD聚集体的QD间相互作用对其辐射衰变的影响。事实证明，Mn ²⁺取代的QD表现出持久的PL量子效率，而未取代的CsPbX ₃型QD则表现出PL效率的急剧降低。并且获得的PL迹线对样品状态明显敏感。讨论了可能的相互作用，具体取决于QD聚合的大小和距离。