Where me* and mh* are the electron and hole effective masses, h is Planck’s constant divided by 2п, к is the carrier wave number, and EV and EC are the valence and conduction band edges, respectively. Electrons in the conduction band and holes in the valence band are assumed to have the parabolic dispersion The properties of spontaneous emission in LEDs will be discussed in this section.Īn electron-hole recombination process is illustrated schematically in Fig. Spontaneous recombination has certain characteristics that determine the optical properties of LEDs. The spontaneous emission process is fundamentally different from the stimulated emission process occurring in semiconductor lasers and superluminescent LEDs. The physical mechanism by which semiconductor LEDs emit light is spontaneous recombination of electron-hole pairs and simultaneous emission of photons.
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