Light Emitting Diodes
Light Emitting Diodes Chemistry Matters Issue: April 2001, pgs.4-5 Summary: Diodes are devices that provide a one way path for current. When current flows through an LED light is emitted. ... Therefore to use silicon in the diodes we use every day we need to modify it with a process called doping. ... When electricity is added to the sandwich light is emitted, but when electricity is taken away the flow stops and the positive and negative even out.