Light-emitting diodes are made of III.-IV. group compounds, such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (gallium arsenide phosphate) and other semiconductors, and their core is a PN junction.

Light-emitting diodes are made of III.-IV. group compounds, such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (gallium arsenide phosphate) and other semiconductors, and their core is a PN junction.

LEDs have many applications, some of which will be explained below.

LEDs are used as light bulbs in homes and industries
Light-emitting diodes are used in motorcycles and automobiles
These are used in mobile phones to display messages
Use LEDs at traffic lights

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