In this note, we will discuss about the Multicolor LED, About its Construction, Symbol, and Working Principle also. Welcome to Poly Notes Hub, a leading destination for Polytechnic Note.
Author Name: Arun Paul
What is Multicolor LED ?
An LED that emits one color when it is forward-biased and another color when it is reverse-biased is called a multi-color LED.
How Multicolor LED works
One commonly used schematic symbol for these LEDs is shown in Fig. Multicolor LEDs contain two PN Junctions that are connected in reverse parallel i.e. they are in parallel with the anode of one being connected to the cathode of the other. If a positive potential is applied to the top terminal as shown in Fig (i)., the PN Junction on the left will light. Note that the device current passes through the left PN Junction. If the polarity of the voltage source is reversed as shown in Fig (ii)., the PN Junction on the right will light. Note that the direction of the device current has reversed and is now passing through the right PN Junction.
Multicolour LEDs are typically red when biased in one direction and green when biased in other. If a multicolour LEDs is switched fast enough between two polarities, the LED will produce a third colour. A red/green LED will produce a yellow light when rapidly switched back and forth between biasing polarities.