Emission mechanisms of InGaN single quantum well blue and green light emitting diodes and multiquantum well structures were investigated by means of modulation spectroscopy. Their static electroluminescence (EL) peak was assigned to the recombination of excitons localized at certain potential minima in the quantum well. The blueshift of the EL peak caused by the increase of the driving current was explained by combined effects of the quantum‐confinement Stark effect and band filling of the localized states by excitons.

Topics
Quantum confinement, Excitons, Localized states, Doppler effect, Modulation spectroscopy, Stark effect, Electroluminescence, Light emitting diodes, Quantum wells, Lasers
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© 1996 American Institute of Physics.
1996
American Institute of Physics
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