What is Floroscence?

Question

i dont wanna any sites name , just xplain me .

Answer 1

Fluorescence is caused when the electrons in a material are excited by incoming electromagnetic radiation, and then decay back to their "ground-state" by emitting slightly different radiation.

Basically, the arrangements of electrons in some chemicals is such that light of a specific wavelength is exactly right for giving the electrons enough energy to rise to a more energetic state. Different wavelengths of light either don't contain enough, or contain too much energy.

These excited electrons, however, do not remain at their excited level for very long. They emit a photon of light of a slightly longer wavelength (ie - a different colour of light), and "decay" back down to their ground-state.

Answer 2

The illumination of a phosphorescent in an electric field.

1.the long tubular lamps that use a mercury vapor for the electric

field with phosphor salt coated on the inner surface.

2. the red green and blue pixel dots on the phosphor screen of a cathode ray tube.

Answer 3

You mean Fluorescence?

Fluorescence occurs when a molecule , atom or nanostructure relaxes to its ground state after being electrically excited.

Like the paint you expose to sunlight and it glows in the dark.  

Also some minerals give off different colors in different light, Fluorine for example.

Answer 4

Fluorescence is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of another photon with a longer wavelength. The energy difference between the absorbed and emitted photons ends up as molecular vibrations or heat. Usually the absorbed photon is in the ultraviolet range, and the emitted light is in the visible range, but this depends on the absorbance curve and Stokes shift of the particular fluorophore. Fluorescence was coined by George Gabriel Stokes in his 1852 paper, the name was given as a description of the essence of the mineral fluorite, composed of calcium fluoride, which gave a visible emission when illuminated with "invisible radiation" UV radiation.

regards and hope it helped