A chiral bipolar host for efficient solution-processed circularly polarized OLEDs via a chirality energy transfer process.

Chiral bipolar hosts of ( R / S )-L-2mCPCN are synthesized, which show high singlet/triplet energy levels and clear circularly polarized luminescence. Employing racemic phosphorescent and TADF materials as emitting guest molecules, solution-processable CP-OLEDs based on such chiral hosts are obtained with an EQE max of 10.7% and | g EL | values of 5.0 × 10 -3 .