Photophysical Reaction Essay

PHOTOPHYSICAL REACTIONS:

Definition:

“The phenomenon that elaborates the not reactive reactions which include both the reactions which emit radiations of light and also those reactions which do not emit radiations”

The energy of these reactions can be obtained from the longest ban of the wavelength of these reactions.

Energy transfer:

The energy that is transferred due to which a molecule which is in its excited state M* transfers some part of its excitation energy to its partner, Q, is called energy transfer. This can be expressed by a formula:

TYPES:

These are the two types of photophysical reactions:

 Fluorescence

 Phosphorescence

FLUORESENCE

Definition:

“When light emits from a substance due to absorbing electromagnetic

IN PIGMENTS:

In pigments, the phosphorescence is used to make inks, resins, and paints.

• Plastic resins

The plastic resins are used as the phosphorescent pigment due to the presecne of transparent material in it.

• Paints Paints

The phosphoresent pigments and a sticky medium are use to make phosphorescent paints. The methods which adopts for painting are, like spray injection, machine coating etc. IN SEA:

This process is important in sea navigation because it makes the shoreline visible which helps to detect the concentration of fishes so that they can easily be caught. This process help fishes in:

• Camouflage:

Many animals use this phenomenon to hide themselves from their enemies like squids do.

• Attracting mates:

It is also used in attraction the mates like in fireflies which attract their mates by glowing their abdomens.

• Communication:

Many different fishes communicate with each other through lightning and regulate luminesence in bacteria.

• Illumination:

Many marine animals have the ability to glow red in sea because the red colour is invisible in sea water to protect themselves from the prey for instance, bioluminescence is of green colour but it glows blue in the same way the black dragonfish glow