Fig. 2: Magnetic field effect on circularly polarized PL of the Cs3Cu2I5 film.
From: Spin-polarized self-trapped excitons in low-dimensional cesium copper halide
a 3D pseudo-color plot of left- (σ+) and right-circularly (σ−) polarized PL spectra in magnetic fields from −16 T to 16 T at T = 4.2 K. b Peak energy of the σ+ and σ− polarized PL and energy splitting (ΔE) versus B. The inset illustrates the excitons energy levels, where the magneto-PL arises from the Zeeman splitting of Jz = ±1 states. The reversal of the +1 and −1 states, due to the highly localized Cu2+ ions, leads to the giant Zeeman splitting. c σ+-and σ−-polarized PL at different T. d ΔE versus T. e Comparison of exciton PLQY and effective exciton g-factor per spin in typical DMS materials (Co2+:CdSe QDs34, Mn2+:ZnSe-CdSe QDs8, Cu2+:ZnSe-CdSe QDs9, Mn2+:CdSe QDs35) and Cs3Cu2I5.
