Circularly Polarized Electroluminescence From Chiral Manganese(II) Complexes

Abstract Due to the circularly polarized luminescence (CPL) and high efficiency, chiral phosphorescent complex holds promise for CP organic light‐emitting diode (CP‐OLED) and 3D display, but the application of chiral manganese(II) (Mn(II)) complex is rare. Herein, the CP‐OLEDs with Mn(II) enantiomers, R / S ‐DFPO‐MnBr 2 and R / S ‐XTDPO‐MnBr 2 , based on tert ‐butyl(6‐(diphenylphosphoryl) dibenzo[ b , d ]furan‐4‐yl)(phenyl)phosphine oxide and tert ‐butyl(5‐(diphenylphosphoryl)‐9,9‐dimethyl‐9 H ‐xanthen‐4‐yl)(phenyl) phosphine oxide ligands are reported containing phosphorus‐centered point chirality. R / S ‐DFPO‐MnBr 2 and R / S ‐XTDPO‐MnBr 2 exhibit yellow‐green emissions peaking at 541 and 532 nm with photoluminescence quantum yields of up to 87%, CPL spectra with dissymmetry factors (| g PL |) around 2.0 × 10 −3 . The CP‐OLEDs achieve external quantum efficiencies of up to 12.9% and CP electroluminescence spectra with | g EL | values of about 1.8 × 10⁻ 3 , suggesting potential application of chiral Mn(II) complexes.