Fluorescence, is the property with in certain substances of transforming light received by them into light of longer wavelength.
Luminescence, property of a material to emit light.
Radioactive, emission of ionizing radiation or particles.
Radium, "Rare metal, symbol Ra. Radioactive element extracted from ores containing uranium. The term radium is often used by watchmakers for a luminous material made of zinc sulphide excited by a radioactive salt (radium, mesothorium, radiothorium). These salts, in paste form, are applied to hands and chapters and are fixed with transparent varnish. A radium dial, radium hands. The activity of radium diminishes by one half after 1750 years." (Berner)
Super-LumiNova, is the brand name under which strontium aluminate–based, non-radioactive and nontoxic photoluminescent or afterglow material is made.
Tritium, is a safe radioactive material which glows in the dark and has a short half-life of approximately 13 years.