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

Abstract

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.

In Situ Growth of High-Quality CsPbBr3 Quantum Dots with Unusual Morphology inside a Transparent Glass with a Heterogeneous Crystallization Environment for Wide Gamut Displays

“…26 The constituent ions of perovskite CsPbBr 3 QDs, such as Pb 2+ , Cs + , and Br − , have an inherent ionic nature and exhibit more mobility than those in a glassy matrix of a highly covalent nature. 27 Precursor glass can be thought of as a supercooled liquid that is thermodynamically metastable, where Pb 2+ , Cs + , and Br − ions are distributed homogeneously within the glass network and saturated under ambient temperature, similar to a date cake model. Upon heating, these ions diffuse and combine to form CsPbBr 3 nanocrystals in the glass (Figure 1).…”

“…Precipitation of CsPbBr 3 QDs crystals in glass is remarkably analogous to those synthesized by wet chemistry, where the spatial network structure of glass acts as a microreactor, similar to the solvent media in wet chemistry, and it is not involved in the formation of the final product . The constituent ions of perovskite CsPbBr 3 QDs, such as Pb 2+ , Cs + , and Br – , have an inherent ionic nature and exhibit more mobility than those in a glassy matrix of a highly covalent nature . Precursor glass can be thought of as a supercooled liquid that is thermodynamically metastable, where Pb 2+ , Cs + , and Br – ions are distributed homogeneously within the glass network and saturated under ambient temperature, similar to a date cake model.…”

Advanced composite glasses with metallic, perovskite, and two-dimensional nanocrystals for optoelectronic and photonic applications

“…It is also worth noting that the post-melting heat treatment during the crystallization process is of critical importance in affecting the quality, as well as the optical and emission properties of the encapsulated PNCs. 62,81,82,85…”

Surface ligand engineering involving fluorophenethyl ammonium for stable and strong emission CsPbBr3 quantum dots and high-performance QLEDs

“…Since Kovalenko and his colleagues first synthesized allinorganic halide perovskite (CsPbX 3 , X = Cl, Br and I) quantum dots (QDs) in 2015, they have become one of the most promising materials in the field of optoelectronics. [1][2][3][4][5][6][7][8] Owing to their unique characteristics, such as high brightness, high color purity, precise tunable bandgaps, narrow emission line widths and high photoluminescence quantum yields (PLQYs), [9][10][11][12] perovskite quantum dots (PQDs) have shown great potential in light-emitting diodes (LEDs), [13][14][15][16][17] solar cells, 18,19 lasers, 20,21 radiation detectors, 22,23 etc. However, there are still some issues that need to be addressed for the practical applications of PQDs.…”