That the structure is sandwiched between layers having a larger band gap and a very thin layer has a small band gap. Potential of the layers having a smaller band gap is lower than the (layer band gap is large) around, has been able to (quantum well) the potential well. In such a semiconductor laser or LED, is used for the active layer for emitting light quantum well structure. Referred to as: (multi quantum well MQW) multiple quantum well structure is overlaid multiple quantum well.
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