1. UV Radiation Generation:
* The fluorescent lamp contains mercury vapor.
* An electric current is passed through the lamp, exciting the mercury atoms.
* These excited atoms emit UV radiation, which is invisible to the human eye.
2. Phosphor Absorption and Emission:
* The inner surface of the lamp is coated with a phosphor, a substance that absorbs UV radiation.
* The absorbed UV energy excites the electrons in the phosphor molecules.
* As the electrons return to their ground state, they release energy in the form of visible light.
3. Visible Light Emission:
* The specific color of the emitted light depends on the composition of the phosphor.
* Different phosphors emit different wavelengths of light, allowing for the production of various color temperatures.
In summary:
* The phosphor in a fluorescent lamp acts as a converter, transforming invisible UV radiation into visible light.
* This process is achieved by the phosphor absorbing UV energy and emitting visible light as electrons return to their ground state.
Additional Notes:
* The phosphor coating is typically a mixture of different phosphors to achieve the desired color balance and efficiency.
* Fluorescent lamps are known for their energy efficiency compared to incandescent lamps, as they convert a larger percentage of electrical energy into light.
