light emitting diode is physics based
define what a light emitting diode is. explain the basic physics of how it works. go over history: leds first widely proliferated in the late 70's -- appearing in digital wrist watches, digital calculators and other appliances with illuminated displays. but they were quickly supplanted by lcd (liquid crystal diode) technology because lcd technology consumed far less power than their led counterparts. but in recent years, led technology has been reinvented and is experiencing a renaissance of sorts. then you can go into all the current led technologies -- the high efficiency leds that can convert almost all the applied power into light, oled technology (organic leds) and why it is a significant improvement over traditional led technologies. identify applications of modern led technologies -- solar powered lights, tv and computer screens, etc.
