Fig. 2: Photoluminescence study of pristine MAPbI3 and 2%Nd:MAPbI3 films.
From: Light-induced Kondo-like exciton-spin interaction in neodymium(II) doped hybrid perovskite
a The temperature-dependent ss-PL peak wavelength, and PL intensity ratio of 2%Nd:MAPbI3 to pristine MAPbI3. b Temperature-dependent lifetime < τ > of pristine MAPbI3 vs. 2%Nd:MAPbI3 extracted from temperature-dependent time-resolved PL decays study. c Summary of lifetime < τ > at different temperatures and Nd2+-to-photon density ratios. All lines are as a guide to the eye. d Temperature-dependent lifetime < τ > of pristine MAPbI3 vs. 2%Nd:MAPbI3 under magnetic field (normal to sample surface with magnetic field strength of 1500 Gauss near sample surface) extracted from temperature-dependent time-resolved PL decays study. e Recombination of photocarriers in pristine MAPbI3. f In the absence of a magnetic field, the spin exchange interactions between the isotropic localized spins of Nd2+ cations with the electron and hole in the exciton are allowed to occur respectively, as these interactions do not break the total spin = 0 of the exciton. g In the presence of a magnetic field, the localized spins on Nd2+ cations are anisotropically polarized, preventing the coupling between Nd2+ spin with either electron or hole in the exciton as otherwise the net spin of exciton becomes non-zero.
