Apr 8, 2025
3:15pm - 3:45pm
Summit, Level 3, Room 343
Bin Hu1
South China University of Technology1
Hybrid metal-halide perovskites are formed with
J exciton carrying orbital and spin momentum. Essentially, the J excitons are responsible for generating optoelectronic outcomes such as light-emitting and photovoltaic properties in such hybrid perovskites. Importantly, using the orbital and spin momentum provides the fundamental capabilities to tune the optoelectronic properties. Here, we present that that circularly-polarized photoluminescence and pump-probe spectroscopy together with magnetic field effects provide deeper experimental methods to reveal the effects of orbital and spin momentum on the photoluminescence (PL) in hybrid metal-halide perovskites. We found that switching the photoexcitation between circular and linear polarizations can lead to different PL intensities, generating the so-called DPL phenomenon. This DPL phenomenon can elucidate how orbital polarizations are mutually interacting between excitons towards developing PL, ASE, and photovoltaic properties. On the other hand, applying a magnetic field can also change the PL intensity, leading to magnetic field effects of PL. We found that magnetic field effects of PL can reveal how spin momentum affects the intersystem crossing between different J states. This presentation will discuss and summarize the effects of orbital and spin momentum on the optoelectronic properties in hybrid metal halide perovskites by using circularly-polarized spectroscopy and magnetic field effects.