Researchers achieve >99% photoluminescence quantum yield in metal nanoclusters

https://phys.org/news/2024-03-photoluminescence-quantum-yield-metal-nanoclusters.html

"near-unity room-temperature photoluminescence quantum yield (PLQY) in near-IR emission of gold-copper nanocluster alloys in solution at room temperature... triplet sensitization experiments confirmed processes attributed to ultrafast intersystem crossing (ISC) from singlet state (S1) to T1. Due to copper doping, Au16Cu6 has smaller ∆Est, accelerating its ISC rate, so Au16Cu6 ultimately showcases PLQY close to 100%... highly emissive metal cluster materials, biological imaging, luminescent devices"