Opinion Essay on Inventions Essay Example for Free

Opinion Essay on Inventions EssayA light-emitting diode (light-emitting diode) is a semiconductor light source. 6 LEDs argon employ as indicator lamps in some(prenominal) devices and are increasingly use for other lighting. Appearing as practical electronic components in 1962,7 earlier 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 energy in the form of photons. This event 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 area (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, h ourlong lifetime, improved physical robustness, smaller size, and faster switching. However, LEDs powerful enough for room lighting are comparatively expensive and require more precise current and heat management than compact fluorescent lamp sources of corresponding output.Light-emitting diodes are used in applications as diverse as aviation lighting, digital microscopes, automotive lighting, advertising, worldwide lighting, and traffic signals. LEDs have allowed new text, video displays, and sensors to be developed, while their high switching rates are also useful in advanced 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.