Opinion Essay on Inventions Essay Example for Free

Opinion Essay on Inventions EssayA light-emitting diode (LED) is a semiconductor light source. 6 LEDs ar used as indicator lamps in many devices and are increasingly used for other lighting. Appearing as practical electronic components in 1962,7 early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.When a light-emitting diode is switched on, electrons are able to recombine with holes within the device, releasing muscularity in the piss of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. A LED is often small in range (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern. 8 LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved phys ical robustness, smaller size, and faster switching. However, LEDs powerful enough for room lighting are relatively expensive and require more hairsplitting current and heat management than compact fluorescent lamp sources of comparable output.Light-emitting diodes are used in applications as diverse as aviation lighting, digital microscopes, automotive lighting, advertising, general lighting, and traffic signals. LEDs have allowed new text, video displays, and sensors to be developed, while their high switching rates are besides useful in ripe(p) communications technology. Infrared LEDs are also used in the remote control units of many commercial products including televisions, DVD players and other domestic appliances. LEDs are also used in seven-segment display.