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What makes phosphorescence last longer?Featured science projectScience project video


The hypothesis that glow-in-the-dark stickers will continue glowing the longest after the ultraviolet light and stop glowing the fastest after the infrared light is proven to be true. Infrared light and the incandescent light generate more heat and are in the lower frequency side of the light spectrum. The florescent lamp, mineral lamp and ultraviolet lamp generate light in the higher frequency spectrum. These lamps generate more ultraviolet light which is absorbed by the atoms.

The luminance of the phosphorescence material is popular among children toy and is also used in designing T-shirts. It can also be used as source of temporary light during sudden blackouts. Traffic police, road side workers and motorist also wear jackets with phosphorescence material coatings for safety and to be seen at night. 

Also consider

The experiment can also be done using a luxmeter to measure the illuminance of the stickers.

How will the results be if different type of phosphorescent material is used? (i.e. zinc sulfide) 


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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 10 hours for observation
Material availability:
You will need access to UV/infrared lamps
Safety concerns: