Light Emitting Diode
A light emitting diode (LED) is a diode that gives off visible light when forward biased. Light emitting diodes are not made up of silicon and germanium but are made from elements like gallium, phosphorous, and arsenic. By varying the quantities of these elements, it is possible to produce light of different wavelengths with colors that include red, green, yellow, and blue.
For example, when an LED is manufactured using gallium and arsenic, it will produce a red light. When it is manufactured by using gallium and phosphide, it will emit green light.
Working of LED is the electron from n-type material cross the PN junction and recombines with holes in the p-type material. The free electrons are in the conduction band at a higher energy level than the holes in the valence band. When recombination takes place, the recombining electron releases energy in the form of heat and light.
So this is all about the different types of light bulbs. Thanks for reading.