Spontaneous emission is the process by which a light source such as an
atom,
molecule,
nanocrystal or
nucleus in an
excited state undergoes a transition to the
ground state and emits a
photon. Spontaneous emission of light or luminescence is a fundamental process that plays an essential role in many phenomena in nature and forms the basis of many applications, such as fluorescent tubes, television screens, plasma display panels, lasers and light emitting diodes.
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Radiation emitted when the internal energy of a quantum mechanical system drops from an excited level to a lower level without regard to the simultaneous presence of similar radiation. Note: Examples of spontaneous
emission include radiation from an LED, and radiation from an injection
laser below the
lasing threshold.
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