chemistry question. based on Bohr's theory?

Question

Is it possible for a fluorescent material to emit radiation in the ultraviolet region after absrobing visible light?

Answer 1

No. The opposite (emitting visible light after absorbing UV) is possible. When light is emitted, it must have the same energy as the light absorbed, or it must have a lower energy. UV light has higher energy than visible light, and so a material can't absorb visible and emit UV.