pittiKUMAR on Twitter: "#LED:- 2junctionsONLY #PNdiode A #ZnO p-n junction light-emitting diode was fabricated on a-plane Al2O3 substrate in 1960s Now also we use 1nmTHICK #GaAs as @ntype, and 2nm GaAS as @
Light Emitting Diode (LED) - Last Minute Engineers