Revealing long-range orbit-orbit interaction between coherent light-emitting excitons occurring in amplified spontaneous emission in CsPbBr3 microstructures

摘要

Amplified spontaneous emission (ASE) has become a common phenomenon in hybrid perovskites by establishing coherent light-emitting excitons. This paper reports a new phenomenon that the long-range orbit-orbit interaction is established through orbital polarizations between coherent light-emitting excitons during the generation of ASE in the CsPbBr3 microrods. Essentially, when the orbital polarizations are optically generated with the same direction between coherent light-emitting excitons by using a circularly polarized pumping beam, the ASE amplitude can be largely enhanced by 22.3%, as compared to the situation when the orbital polarizations are generated with opposite directions by using linearly polarized photoexcitation in randomly orientated microstructures. This observation provides evidence that long-range orbit-orbit interaction occurs between coherent light-emitting excitons in ASE. Furthermore, the long-range orbit-orbit interaction between coherent light-emitting excitons is simultaneously increased with the ASE amplitude while increasing the pumping fluence. Therefore, the long-range orbit-orbit interaction plays an important role in developing coherent light-emitting excitons towards ASE in metal halide perovskites.