LED Full Form

What is the full form of LED?

The full form of LED is Light Emitting Diode. LED is a semiconductor device that emits light when an electric current flows through it. When current passes through an LED, the electrons recombine with holes emitting light. LEDs allow the current to flow forward and block the current in the reverse direction.


Symbol of LED

The symbol of the LED is similar to the symbol of the p-n junction diode. The distinction between those two symbols is that the two arrows indicate the diode emitting the light, as shown above.

Working Principle

Light-emitting diodes are semiconductor light producers that combine a type P semiconductor with a higher concentration of a hole and a type N semiconductor with a higher concentration of electrons. Applying a proper forward voltage at the P-N junction will cause the electrons and holes to recombine and release energy in the form of light.

Types of LED

The different types of LEDs designed using semiconductors are listed below.

  • Miniature LEDs
  • Lighting LED
  • Red Green Blue LEDs
  • Flash LED
  • High-Power LEDs
  • Alphanumeric LED

Applications of LED

LEDs are used in various fields, including warning systems, optical communications and security systems, robotics, remote-controlled operations, etc. Due to its long-lasting capacity, low power demands, quick response time and rapid switching capabilities, it finds use in many of these areas, such as;

  • Used in various displays
  • Used in the dimming of light
  • Used in the automotive industry
  • Used in TV backlight.


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