Luminescence enhancement of CsPbBr3 quantum dots glasses induced by two unexpected methods: mechanical and hydration crystallization

Theoretically, the realization of phase transformation in glass requires enough energy to overcome a certain barrier. Conventionally, the transition from amorphous to crystalline is realized by controlling the crystallization process in the heating process. However, little progress has been made in the reviews about mechanical crystallization and hydration crystallization, which does not involve excessive energy transition process. In this work, CsPbBr3 quantum dots glasses with good thermal stability and water stability were firstly obtained by the methods of mechanical crystallization and hydration crystallization, which are completely different from the traditional methods. Intense 523nm emission with long lifetime of 75.2ns was observed in the CsPbBr3 quantum dots glass under mechanical stress. Interestingly, strong green emission was found in the CsPbBr3 quantum dots glass under hydration condition. Furthermore, the CsPbBr3 quantum dot glass obtained by mechanical devitrification shows the phenomenon of luminescence enhancement with the extension of the observation time in water, which further verifies the phenomenon of the hydration crystallization. In short, the present work not only provides a novel channel for the future study of quantum dots, but also brings significant revolution to the production behavior of quantum dots glass materials.