Table of Contents
What is light emitting diode explain?
In the simplest terms, a light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed through it. Since light is generated within the solid semiconductor material, LEDs are described as solid-state devices.
How many types of LED are there?
LED Colour The light emitted by normal LED bulbs comes in three different varieties which are: Warm white which is used in most homes and is similar to current halogen bulbs. Cool white is a similar colour to fluorescent tubes such as those you find in shops and offices.
What are two primary types of LEDs?
The two basic types of LEDs are indicator-type LEDs and illuminator-type LEDs. Indicator-type LEDs are usually inexpensive, low-power LEDs suitable for use only as indicator lights in panel displays and electronic devices, or instrument illumination in cars and computers.
What is light emitting diode explain construction and working?
Definition: The LED is a PN-junction diode which emits light when an electric current passes through it in the forward direction. In the LED, the recombination of charge carrier takes place. The LED is made of semiconductor material which is colourless, and the light is radiated through the junction of the diode.
What are the uses of light emitting diode?
The major uses of LED (Light Emitting Diodes) are to illuminate objects and even places. Its application is everywhere due to its compact size, low consumption of energy, extended lifetime, and flexibility in terms of use in various applications.
What are light emitting diode Class 12?
A light emitting diode (LED) is a forward biased p-n junction diode That emits visible light when energized. LED work on the phenomenon of electroluminescence. The colour of light emitted depends on the semiconducting material used.
What is light emitting diode draw a circuit diagram and explain its action?
Light-emitting diode (LED) is a forward biased p-n junction diode which emits visible light when energized. The light energy is produced by the recombination of electrons and holes at the junction. Emit radiation in the infrared region. If light – emitting diode is reverse-biased, then no light would be emitted at all.