What makes phosphorescence last longer?
The lamp that produces more ultraviolet light will be able to make the glow of phosphorescence material last longer.
Phosphorescence occurs when energy in light waves is absorbed by a phosphorescent material and later released in the form of light, at a very slow rate. This slow release of light energy is what causes the glow-in-the-dark sticker to continue glowing over a period of time.
When ultraviolet light is absorbed by the phosphorescent material, electrons in the atom become"excited". These electrons will eventually return to their normal energy levels, gradually. It is during this gradual process of electron state"degradation", that the material is seen to glow.
Different types of lamps (mentioned below) are used to simulate different bands of light in the spectrum.
Infrared lamp - consists mainly of infrared light. Most of the infrared energy is lost as heat.
Incandescent lamp - emits a large percentage of infrared light
Florescent lamp - emits more ultraviolet light than the incandescent lamp
Ultraviolet lamp - consists mainly of ultraviolet light