Facts of the Matter: Blue LED offers bright, energy-efficient light

If you are reading this at night, chances are the light hitting this page is coming from a tiny technological marvel: the blue light- emitting diode, or blue LED. It may seem ordinary now, but its invention in the early 1990s opened the door to everything from bright white LED bulbs to the screens on your phone.

See the original article at: Honolulu Star-Advertiser