Nanowerk October 5, 2023
Hybrid perovskite semiconductor materials are predicted to lock chirality into place and encode asymmetry into their electronic states, while softness of their crystal lattice accommodates lattice strain to maintain high crystal quality with low defect densities. An international team of researchers (Germany, France, USA – Harvard University) has reported photoluminescence quantum efficiencies as high as 39% and degrees of circularly polarized photoluminescence of up to 52%, at room temperature, in the chiral layered hybrid lead-halide perovskites. Using transient chiroptical spectroscopy, they explained the photoluminescence yields from suppression of nonradiative loss channels and high rates of radiative recombination. They found that photoexcitations polarization lifetimes exceeded the time scales of radiative decays, which rationalized the high degrees of polarized luminescence. According to the researchers their findings pave the way toward high-performance solution-processed photonic systems for chiroptical applications and chiral-spintronic logic at room temperature… read more. Open Access TECHNICAL ARTICLEÂ