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

Abstract

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.

Luminescent Au(III)–M(I) (M = Cu, Ag) Aggregates Based on Dicyclometalated Bis(alkynyl) Gold Anions

“…As part of our search for photoluminescent gold(III) chelate and pincer complexes, ,,, we turn our attention to the study of luminescent gold(III)–M(I) aggregates . It is known that the formation of heteronuclear aggregates through supported or unsupported intermetallic contacts, mainly of heavy-metal atoms [Pt(II), Au(I), Ag(I), Cu(I)], not only induces intriguing photoluminescent behavior, due to the presence of noncovalent interactions, that on occasions are sensitive to external stimuli, but also facilitates S 1 to T 1 promotion, thus enhancing the phosphorescence radiative relaxation. − In addition, the molecular rigidity in the final arrays is usually increased in relation to their mononuclear counterparts, and therefore nonradiative deactivation of triplet excited states is distinctly reduced …”

Platinum(ii)–gold(i) heterotrinuclear complexes with N,N′-diarylamine-functionalized acetylide ligands for red electroluminescence

“…Many mononuclear d 8 or d 10 metal complexes are individually non-emissive at ambient temperature, but when they are put together through the d 8 –d 10 interaction, highly efficient phosphorescence is attained in the corresponding d 8 –d 10 heteronuclear aggregates. 5–15 In fact, incorporating non-emissive d 8 and d 10 metal subunits through the d 8 –d 10 intermetallic interaction has been exploited as one of the most viable strategies to achieve highly efficient phosphorescence. 5…”