- published: 25 Mar 2013
- views: 4171162
Phosphorescence is a specific type of photoluminescence related to fluorescence. Unlike fluorescence, a phosphorescent material does not immediately re-emit the radiation it absorbs. The slower time scales of the re-emission are associated with "forbidden" energy state transitions in quantum mechanics. As these transitions occur very slowly in certain materials, absorbed radiation may be re-emitted at a lower intensity for up to several hours after the original excitation.
Commonly seen examples of phosphorescent materials are the glow-in-the-dark toys, paint, and clock dials that glow for some time after being charged with a bright light such as in any normal reading or room light. Typically the glowing then slowly fades out within minutes (or up to a few hours) in a dark room.
The study of phosphorescent materials led to the discovery of radioactivity in 1896.
In simple terms, phosphorescence is a process in which energy absorbed by a substance is released relatively slowly in the form of light. This is in some cases the mechanism used for "glow-in-the-dark" materials which are "charged" by exposure to light. Unlike the relatively swift reactions in a common fluorescent tube, phosphorescent materials used for these materials absorb the energy and "store" it for a longer time as the processes required to re-emit the light occur less often.
This is my confessional
Seven seconds till I hit the ground
But you saved my life!
Now I feel indestructible
So protected when you're around
Yeah, you saved my life!
Bridge:
You make me, you make me feel so incredible
You and I, you and I feels so unbelievable
You're making, you're making so unenviable
Chorus:
A million hearts, but you're the only one
You locked me up like I'm glowing in the dark!
I'm in your heart, you're the only one
You locked me up like I'm glowing in the dark!
This is my confessional
Seven seconds till I hit the ground
But you saved my life!
Now I feel indestructible
So protected when you're around
Yeah, you saved my life!
Bridge:
You make me, you make me feel so incredible
You and I, you and I feels so unbelievable
You're making, you're making so unenviable
Chorus:
A million hearts, but you're the only one
You locked me up like I'm glowing in the dark!
I'm in your heart, you're the only one
You locked me up like I'm glowing in the dark!
This is my confessional
Seven seconds till I hit the ground
But you saved my life!
Now I feel indestructible
So protected when you're around
Yeah, you saved my life!
Chorus: (x2)
A million hearts, but you're the only one
You locked me up like I'm glowing in the dark!
I'm in your heart, you're the only one
You locked me up like I'm glowing in the dark!