Doping (semiconductor)
In semiconductor production, doping intentionally introduces impurities into an extremely pure (also referred to as intrinsic) semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor. Lightly and moderately doped semiconductors are referred to as extrinsic. A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as degenerate.
In the context of phosphors and scintillators, doping is better known as activation.
Read more about Doping (semiconductor): History, Techniques of Doping and Synthesis, Process, Compensation, Doping in Organic Conductors, Magnetic Doping, Single Dopants in Semiconductors, Neutron Transmutation Doping