Efficient circularly polarized luminescence from zero-dimensional terbium- and europium-based hybrid metal halides.

Zero-dimensional (0D) chiral hybrid metal halides (HMHs) with narrow-band circularly polarized luminescence (CPL) show considerable promise in three-dimensional displays. In this work, 0D ( S / R -3MOR) ₃ TbCl ₆ and ( S / R -3MOR) ₃ EuCl ₆ (abbreviated as S / R -TbCl, S / R -EuCl) enantiomers with characteristic rare-earth ion emissions are synthesized. S / R -TbCl and S / R -EuCl exhibit narrow-band green and red emissions with high photoluminescence quantum yields of (85-91)% and (48-52)%, respectively. These materials present distinct CPL signals with dissymmetry factors up to ±0.006 and ±0.009 for S / R -TbCl and S / R -EuCl, respectively. These chiroptical properties confer the potential for their applications in circularly polarized light-emitting diodes for future displays.