Doping Copper(I) in Ag7 Cluster for Circularly Polarized OLEDs with External Quantum Efficiency of 26.7 %

Cu ascribed to rigidizing cluster structure through stronger Ag-Cu interaction apart from dramatically improving thermodynamic stability. Solution-processable circularly polarized organic light-emitting diodes (CP-OLEDs) demonstrate high-efficiency circularly polarized electroluminescence (CPEL) with external quantum efficiency (EQE) of 26.7 %, which is superior to most of red-emitting OLEDs through solution process.