photoluminescent [radiation] phosphor

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photoluminescence — photoluminescent, adj. /foh teuh looh meuh nes euhns/, n. Physics. luminescence induced by the absorption of infrared radiation, visible light, or ultraviolet radiation. [1885 90; PHOTO + LUMINESCENCE] * * * ▪ physics emission of light from … Universalium
Self-powered lighting — is a generic term describing devices that emit light continuously without an external power source. Self powered lighting is most frequently used on wristwatches (i.e. Night watches), gun sights, and certain emergency and tactical equipment.Early … Wikipedia
Exit sign — An exit sign is a device in a public facility (such as a building, airplane or boat) that displays where the emergency exit is. Most exit signs around the world are in pictogram form, with or without text supplement. There has been a shift… … Wikipedia
Phosphorescence — As these transitions occur less often in certain materials, absorbed radiation may be re emitted at a lower intensity for up to several hours.The study of phosphorescent materials led to the discovery of radioactivity in 1896. Explanations of the … Wikipedia

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