Solid-surface room temperature phosphorescence
Luminescence can be defined as radiation emitted from atoms or molecules as they undergo a radiative transition from an excited state to a lower energy state. After the absorption of incident radiation, the emission of a photon during the radiative transition is called photoluminescence. The process of photoluminescence encompasses both fluorescence and phosphorescence.
Gunshefski, M., Santana, JJ., Stephenson, J., & Winefordnert, JD. (1992). Solid-surface room temperature phosphorescence. Applied Spectroscopy Reviews, 27(2), 143-192. DOI: 10.1080/05704929208018106