CsPbBr₃ perovskite quantum dots (QDs) have excellent properties such as high emission quantum yield, adjustable spectrum, and wide color range. They have potential prospects in light-emitting diode (LED) displays and solar cells. However, CsPbBr₃ QDs suffer from a low stability with a high sensitivity to water, heat, and light. Here, for the first time, we report a simple method to improve their stability using a high-temperature solid state diffusion to synthesize highly stable and high-quality CsPbBr₃ QDs in a small pore size LTA zeolite (0.41 nm). First, the mixture of PbBr₂, CsBr and LTA zeolite was heated at 650 °C, and the raw materials PbBr₂ and CsBr were diffused into the LTA zeolite through a small aperture. Then, the CsBr/PbBr₂ in the composite was reassembled into CsPbBr₃ QDs (CsPbBr₃@LTA) at room temperature. The CsPbBr₃@LTA obtained by this synthesis method have a high photoluminescence quantum yield (PLQY ∼66%) and extremely high stability. The PLQY of CsPbBr₃@LTA remained above 66% after being kept in the air for 17 months. The PL intensity of CsPbBr₃@LTA remained 78% of the initial value after being immersed in water for 554 days and the PL intensity changed insignificantly after laser irradiation for 20 days.

CsPbBr ₃钙钛矿量子点（QD）具有出色的性能，例如高发射量子产率，可调节光谱和宽色域。它们在发光二极管（LED）显示器和太阳能电池中具有潜在的前景。但是，CsPbBr ₃ QD的稳定性低，对水，热和光的敏感性高。在这里，我们首次报道了一种简单的方法来提高其稳定性，方法是使用高温固态扩散在小孔径LTA沸石（0.41 nm）中合成高度稳定和高质量的CsPbBr ₃ QD。首先，将PbBr ₂，CsBr和LTA沸石的混合物加热到650°C，并将原料PbBr ₂CsBr和CsBr通过一个小孔扩散到LTA沸石中。然后，将复合物中的CsBr / PbBr ₂在室温下重新组装成CsPbBr ₃ QDs（CsPbBr ₃ @LTA）。通过这种合成方法获得的CsPbBr ₃ @LTA具有很高的光致发光量子产率（PLQY〜66％）和极高的稳定性。在空气中放置17个月后，CsPbBr ₃ @LTA的PLQY保持在66％以上。CsPbBr ₃ @LTA在水中浸泡554天后的PL强度保持初始值的78％，而在激光照射20天后PL强度变化不明显。