Versatile Homoleptic Naphthyl‐Acetylide Heteronuclear [Pt2M4(CC‐Np)8] (M = Ag, Cu) Phosphors for Highly Efficient White and NIR Hybrid Light‐Emitting Diodes

A new family of low-energy emitting organic phosphors (OPs) based on [Pt2M4(CC-1-Np)8] clusters, in which M is either Ag(I) (1) or Cu(I) (2) and CC-1-Np is the strongly delocalized 1-naphthylacetylide ligand, are presented. The inclusion of the 1-naphthylacetylide moiety is crucial to achieve very emissive and stable OPs that do not experience photoinduced heat generation and oxidation in both white and NIR hybrid light-emitting diodes (HLEDs) operating under ambient conditions. In short, the first use of these novel OPs leads to i) HLEDs with NIR emission centered at 730 nm, color purity close to 0.99, and remarkable luminous efficacies of ≈1.5 lm W−1 that is comparable to commercial NIR-LEDs and ii) daylight white LEDs with luminous efficacies of 75 lm W−1 and stabilities of >500 h. Thus, this work provides relevant information for the synthesis, design, and application of a new family of low-energy emitting OPs toward efficient and stable white and NIR hybrid LEDs.