Stable, Low-Threshold Amplification Spontaneous Emission of Blue-Emitting CsPbCl2Br1 Perovskite Nanocrystals Glasses with Controlled Crystallization

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, CsPbCl2Br1 PQDs 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 CsPbCl(2)Br(1)PQDs-embedded glasses exhibit tunable photoluminescence (PL) emissions and absorption edges by controlling the heat-treatment temperatures. Simultaneously, ASE behaviors of CsPbCl2Br1 PQDs-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/cm(2) as the crystallization temperatures increase from 440 to 530 degrees C. Finally, a robust inorganic glass host can insulate the air from CsPbX3 PQDs, which enables the attainment of CsPbCl(2)Br(1)PQDs 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.