A strongly greenish-blue-emitting Cu4Cl4 cluster with an efficient spin–orbit coupling (SOC): fast phosphorescence versus thermally activated delayed fluorescence

Abstract

In this communication, we report a new greenish-blue-emitting Cu(I) complex, Cu₄Cl₄(NP)₂, a with high photoluminescence quantum yield of 90% and a short decay time of 9.9 μs. Due to the strong SOC combined with the small activation energy ΔE_ST, the emission at room temperature consists of approximately equivalent fast phosphorescence and TADF.