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An excess of electrons and holes in p- and n-type material. respectively, (referred to as minority carriers) is created in a semiconductor light source by carrier injection at the device contacts. The excess densities of electrons $n and
holes $p are equal, since the injected carriers are formed and recombine in pairs in accordance with the requirement for charge neutrality in the crystal. When carrier injection stops, the carrier density returns to the equilibrium value. In general, the excess carrier density decays exponentially with time
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