(INVITED) Stability: A desiderated problem for the lead halide perovskites

Abstract

Lead halide perovskites (LHP) have been intensively studied over the past years due to their attractive optical electronic and optoelectronic properties, including narrow band emission covering whole visible region, defect tolerance, and near-unity luminescence quantum yield, which makes them to be promising materials for next generation lighting and display. However, the poor stability of LHP remains the key obstacle restricting their practical applications. This review summarizes the factors which influences the stability of the structure and luminescence properties of LHP, such as the light, heat, humidity and gases. Furthermore, the recent strategies for improving the stability are highlighted at the current state of the art. On the basis of the function mechanism, these methods can be classified into four types: compositional engineering, waterproof materials encapsulation, embedded in heterogeneous crystals, and super-hydrophobic structure, which will be as a guide to overcome the limitations of LHP and impel the development of their practical application. Keywords: Perovskite, Stability, Luminescence, Nanocrystals