Question: What causes some objects to glow under a black light? Black lights give off Ultraviolet A light, which is a type of high-energy invisible light (radiation). Photons are packets of light energy. UV light photons have a higher energy than do the photons for visible light. Materials that glow under a black light contain […]
Fluorescence vs. Photoluminescence
Fluorescence and Photoluminescence are types of luminescence (cold light) where the energy is supplied by EMR (electromagnetic radiation). EMR from most to least energetic are: gamma rays, x-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. The starting EMR energy source needed to produce visible light must be more energetic than visible light. […]