Radiation-Resistant CsPbBr₃ Nanoplate-Based Lasers

The use of nanoscale lasers in new space technologies can enable a variety of applications. Metal lead halide perovskites have emerged and been verified to possess many unique properties for optoelectronic applications, which are key elements for the space mission system. However, the basic knowledge of radiation damage of perovskite materials and the in-depth experimental irradiation testing on their lasing properties are still lacking. Here, the performance of a CsPbBr3 nanoplate (NP) laser is measured to be maintained after exposure to 150 keV proton beam with fluence up to 1 × 1015 p/cm2, an extremely high level of collision that destroys CdS NPs with similar shapes and emission wavelengths. Lasing characteristics and carrier dynamics of the CsPbBr3 and CdS NPs have been studied and compared in detail before and after proton irradiation with different beam fluences. Concurrently, simulation results manifest that negligible atomic displacement damage is caused by proton bombardment in CsPbBr3, ensuring its high resistance to proton irradiation. The findings of the high radiation resistance of the CsPbBr3 NP lasers and the insights into the underlying mechanism are conceivably important, which might make recommendations for the development of perovskite coherent light sources for new space applications.