= Cold cathode
{wiki=Cold_cathode}
A cold cathode refers to a type of electron source used in vacuum tubes and some types of display technologies (like cold cathode fluorescent lamps, or CCFLs) where electrons are emitted from a cathode without the need for significant heating. This is in contrast to hot cathodes, where the cathode is heated to facilitate electron emission through thermionic emission. In a cold cathode, the electron emission is typically achieved through processes such as field emission or Schottky emission.
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