Near-infrared persistent luminescence (PersL) nanoparticles (NPs) have great potential in biomedical applications due to their ability to continuously emit tissue-penetrating light. Despite numerous reports on the distribution. biological safety and other consequences of PersL NPs in vitro and in vivo. there has been a lack of studies on the optical properties of these NPs in the phys... https://www.shiinatactix.com/product-category/rings/