Narrow-band Circularly Polarized Red Electroluminescence in Trinuclear Clusters

R / S -PtAu 2 cluster enantiomers exhibit highly efficient narrow-band red emission with a FWHM of 25–29 nm as well as excellent chiral absorption and emission characteristics with a dissymmetry factor of ±1.0 × 10 −3 for CPL and ±7 × 10 −4 for CPEL.