UV Light UV Lamp Ultraviolet Light Simulator is only for fun and doesn't produce real ultraviolet light.

UV Light UV Lamp Ultraviolet Light Simulator app which emits ultraviolet (UV) light in the long wave range and little visible light. User can change and select the tone of color that you want.

All colors in UV Light Ultraviolet are optimized to show a powerful radiant effect.
UV light simulator app is a wonderful WarmDeep purple light. Black light also referred to as a ultraviolet light. Turn on a black light in a dark room and you'll see a dim purplish glow light.

Disclaimer :
No smartphone is capable of emitting UV Light currently you can mimic the effort of a black light using your phones LED Flash.