The inherent instability severely limits the applications of cesium lead halide (CsPbX₃) perovskite quantum dots (PQDs). Herein, introducing these CsPbX₃ PQDs into all-inorganic amorphous solid matrices is a simple and effective encapsulation strategy to achieve prominent chemical stability. In this work, CsPbCl₂Br₁PQDs are precipitated in borosilicate glasses with the aid of a crystallization control process, followed by the explorations of the optical properties and amplified spontaneous emission (ASE) performance. Our results indicate that the prepared CsPbCl₂Br₁PQDs-embedded glasses exhibit tunable photoluminescence (PL) emissions and absorption edges by controlling the heat-treatment temperatures. Simultaneously, ASE behaviors of CsPbCl₂Br₁PQDs-embedded inorganic glasses have been first demonstrated under 800 nm fs laser excitation at room temperature, the threshold reduces from 1.24 to 0.19 mJ/cm² as the crystallization temperatures increase from 440 to 530 °C. Finally, a robust inorganic glass host can insulate the air from CsPbX₃ PQDs, which enables the attainment of CsPbCl₂Br₁PQDs stability, including better thermostability and photostability. It can be seen that the heat-treatment temperature in the fabrication process is of critical importance in affecting the CsPbX₃ PQDs crystallization and quality, which provides a new strategy for laser applications.

中文翻译：

---

可控结晶的稳定发蓝光的CsPbCl ₂ Br ₁钙钛矿纳米晶体的低阈值放大自发发射

固有的不稳定性严重限制了卤化铯铯（CsPbX ₃）钙钛矿量子点（PQDs ）的应用。在本文中，将这些CsPbX ₃ PQDs引入全无机非晶态固体基质是一种简单有效的封装策略，可实现出色的化学稳定性。在这项工作中，借助于结晶控制过程，在硼硅酸盐玻璃中沉淀出CsPbCl ₂ Br ₁ PQDs ，然后探索其光学性质和放大的自发发射（ASE）性能。我们的结果表明，所制备的CsPbCl ₂ Br ₁通过控制热处理温度，嵌入PQDs的玻璃具有可调节的光致发光（PL）发射和吸收边缘。同时，在室温下在800 nm fs激光激发下，首次证明了嵌入CsPbCl ₂ Br ₁ PQDs的无机玻璃的ASE行为，随着结晶温度从440°C升高到530°C ，阈值从1.24降低到0.19 mJ / cm ^2。。最后，坚固的无机玻璃主体可以使空气与CsPbX ₃ PQD隔离，从而实现CsPbCl ₂ Br ₁的获得。PQD的稳定性，包括更好的热稳定性和光稳定性。可以看出，制造过程中的热处理温度对于影响CsPbX ₃ PQD的结晶和质量至关重要，这为激光应用提供了新的策略。