Who invented the light emitting diode (LED)? What purpose does it serve? How has it impacted society today?

The Light Emitting Diode (LED) was invented by Nick Holonyak Jr. in 1962. He was an engineer at General Electric (GE).

The purpose of LEDs is to emit light when an electric current is passed through them. They are used in a wide range of applications, from small indicator lights on electronic devices to large displays and lighting fixtures. LEDs are more energy-efficient and longer-lasting than traditional light sources such as incandescent and fluorescent bulbs.

The impact of LEDs on society has been significant. They have revolutionized the lighting industry by providing a more energy-efficient and durable alternative to traditional light sources. This has led to significant energy savings and a reduction in greenhouse gas emissions. LEDs have also enabled new technologies and applications, such as high-definition television screens, computer monitors, and traffic lights. They have also improved the quality of life for people in developing countries who do not have access to reliable electricity, as LEDs can be powered by small, inexpensive solar panels.