Researchers have developed innovative gem-digold(I) aryl compounds demonstrating exceptional properties for phosphorescence, having recorded photoluminescence quantum yields as high as 78%. This advancement holds remarkable potential for the enhancement of lighting technologies and display systems.
The study, published on March 15, 2025, focuses on addressing prior limitations seen with mononuclear gold(I) complexes, where sluggish emission rates were frequent. The research team from Tsinghua University, supported by the National Natural Science Foundation of China, aimed to explore the larger scope of luminescence by utilizing gold’s heavy atom effect.
Gold(I) compounds have been of great interest due to their anticipated strong spin-orbit coupling (SOC), which is often tied to improved phosphorescent behavior. Yet, previous iterations reflected poor performance due to mismatched electronic orbitals, particularly for mononuclear variants.
To tackle these issues, the scientists synthesized several organogold(I) compounds by introducing gem-digold moieties paired with various aromatic donor ligands. This strategy led to substantially enhanced interactions between gold and the aryl π orbitals, thereby optimizing SOC.
One prominent outcome revealed SOC values swelling from below 10 cm−1 to impressive rates nearing 239 cm−1, well beyond what had been achieved with existing compounds. The remarkable phosphorescence is attributed to the successful integration of the gold orbitals within the electronic structure of the new compounds, leading to more efficient phosphorescent emissions.
According to the authors of the article, “The integration of the gem-digold moiety allows for improved interactions of gold 6s orbitals with aryl π orbitals, fundamentally altering each compound’s phosphorescence properties.” This synergy not only mitigates traditional electron repulsion but stimulates greater electron transfer efficacy.
The research marks a significant leap toward broader applications of gold-based phosphorescent materials. The findings affirm the potential of these new gem-digold compounds for commercial use, particularly within high-performance light-emitting devices.
These audacious breakthroughs prompt reconsideration of previous paradigms surrounding gold(I) compounds and solidify their standing as formidable candidates for future exploration within photonic applications.